range rover - 1997 - 6th edition

mJ ANTI-LOCK BRAKE SYSTEMABS Booster Unit (Z103)

The ABS Booster Unit (Z103) contains 2 isolationsolenoid valves and 4 pairs of solenoid controlvalves which are grounded through the harness.When the ETC is fitted, the booster unit alsocontains an additional 2 solenoid valves. The pairs ofsolenoid control valves each include a fluid pressureinlet and outlet valves that control ABS braking toone wheel.

The Anti-Lock Brake System ECU (Z108) operatesthese valves by applying battery voltage to them.The valves are designed to decrease, hold orincrease pressure to retain wheel rotation andoptimum braking.

The 2 isolation valves consist of 2 solenoid valvesthat control fluid inlet and outlet. Their function is todisconnect or isolate the master cylinder from theservo cylinder and to connect the servo cylinder tothe reservoir return during ABS functions.

Wheel Speed Sensors (X137, X140, X158, X161)

A wheel speed sensor is located at each wheel. Thespeed sensors generate an AC voltage signal as atoothed ring rotates past the stationary sensorpickup. The Anti-Lock Brake System ECU (Z108)calculates the wheel speed by measuring thefrequency of the AC voltage signal generated by thesensors.

ABS Hydraulic Pump (M102)

The hydraulic boost for the system is provided by theABS Hydraulic Pump (M102), which is controlled bythe ABS Pump Relay (K102) and the ABS PressureSwitch Unit (Z104).

The Pressure Switch unit incorporates threeelectro- mechanical switches. The first operates thepump, two more illuminate the low pressurecondition and signal that ABS and ETC functionsshould be curtailed. The Hydraulic Pump includes ahydraulic accumulator and non-return valve, as wellas a pressure relief valve to protect the system.

When low pressure occurs in the brake system, aswitch in the pressure switch unit closes to groundthe coil of the pump relay. The pump relay nowenergizes and applies battery voltage from the fuseto the hydraulic pump through the closed relaycontacts. The hydraulic pump runs to increasepressure in the hydraulic accumulator. Whensufficient pressure is developed in the system, thepressure switch opens to de-energize the pumprelay and to turn off the hydraulic pump.

CIRCUIT OPERATION

ABS Warning Lamp

The Anti-Lock Brake System ECU (Z108) sendssignals to the BeCM which then controls theillumination of the ABS warning lamp. The BeCMalso controls the display of the system messages.

Solenoid Valve Relay

This is energized by the ABS ECU and sendsvoltage back to the part of the same ECU whichcontrols the solenoid valves in the booster. When theABS ECU detects a fault that requires a completesystem shutdown, the relay is de-energized.

ANTI-LOCK BRAKE SYSTEM mJ

P125aEngine Compart-ment Fuse Box

r----I Z1081 1Anti-Lock Brake1 IP\ 1System ECU1 \::y 11 11 ...1

8] C116R LHDC116L RHDBG

6 C176

---~----]---------~;---

[

27 F24

~A 5A3 1 ~]----

RL2

[2]

A.B.S.Power Relay

RHD

LHD

S118

S103

B--

RHDLHD

IS115 ;

I See Ground Dis-I tributionI.. E167

__~r=~~-~ 4_______ _ _5 C173 21 C172 8 C176

NK B W

S114 See Ground Dis-

I tributionI .-....j.~ See Fuse Details

7 C506B .;. E167 1C106B

- NAS C116R LHD29 C116R LHD 1 ~ C116L RHDr--------------------------------m Z108

1 I Anti-Lock BrakeI I System ECUI II J

27 -------------312}--26] C116R LHDC116L RHD

B WK YG BS

12 ..JL C114 10 C112r------------, Z2381 IP\ 1Body Electrical1 \::y 1Control ModuleL J (BECM)

See Ground Dis-tribution

r----' Z132I IP\ I Engine ControlI \::y I Module (ECM)L J

1 C507

YK

CIRCUIT DIAGRAM

mJ ANTI-LOCK BRAKE SYSTEM

C112 16] C114BW BP

C124L LHD2 C124R RHD

gJX111Brake Fluid levelo - 1 Switch1 C124L LHD

C124R RHD

BG

BG BW

Z108Anti-Lock BrakeSystem ECU

--31 C116R LHDC116L RHD

Z238Body ElectricalControl Module(BECM)

30

11

[17] A.B.S. PumpRelay

P125aEngine Compart-ment Fuse Box

7 C1778

NR BY

C184L LHD

C184RRHD

1

B B

II S110 LHD

S122 RHDI~~~u~:~und Dis-! E154 LHD.. E181 RHD

5

C156L LHDC156R RHD

III E154 LHD.. E182 RHD

1

2

C156L LHDC156R RHD

~"- M102A.B.S. HydraulicPump

CIRCUIT DIAGRAM


Petrol

01-5

Tp5203i

Diesel

Not installed onall vehicles

.:K152Resistor

9C202

C1029

C202C102

B

5207--....

! E2522 C121

C571

13

K

IC116R LHD10 C116L RHO14 C116R LHD

C116L RHO

LG

KR

31 C572

I I Z132I IP'\ I Engine ControlI \::y I Module (ECM)I I

Z108Anti-Lock Brake5ystem ECU

LGR

_______ C102

15 KR 16 C202

LGR5214. ---lIlII

L 5213---lIIIIII7 ~J C231X318Data Link Con-nector (OBDII)

CIRCUIT DIAGRAM

Data Link Con-nector


r----30---IZ238

1 E1 1Body Electrical1 1Control Module10 A 1(BECM)

1 11 - _

71 C258I See Fuse Details

S205.

InstrumentCluster[15] Control Unit

and Mess-age CentreDisplay

Qge Q9 ~~ Q9 ID (l)r ---.r-----~-----.J--~~~-l [15)I \::y IL_ __ ill

r------------ ------- -----------Z142

7 17 8 18 2 12 3 13 5

__ ...I

15 C242

B B BG BG RG RG OG OG LG LG

14 52....!0 1 9....!1 3 C256r---------------------------, Z238I IP\ I Body ElectricalI \::y I Control ModuleL J (BECM)

D CIRCUIT DIAGRAM

DATA LINK CONNECTOR I!II

1 30 1 P125aI~F 33 1 Engine Com-1 5 A 1 partment Fuse1 J Box4 C172

1 1Z2601 IP'\ 1Air Suspension1 ~ 1Delay Turn OffI J Timer

3 C118

N SR

13C102C202 6

C104C204

16 1 C231

X318Data Link Con-nector (OBDII)

12 11 C204C104

35 17 C117

r-----I Z1651 IP'\ 1Air Suspension1 ~ IECU

~ 1 1Except NAS

11 12 C2315

5

14 14

YK YG

17 C202C102

NAS

YLG WLG WK

9 C401

1 1Z151

I I~~s~:gc~~t~~11 1Module2

1 1Z1511 IP'\ 1Air Bag Diag-1 ~ 1nostic Control1_____ 1Module

5 C103C403

20 11 C401

.. E181

CIRCUIT DIAGRAM

IEII DATA LINK CONNECTOR

1-----1 Z1321 I?'\ 1Engine Control1 \::y 1Module (ECM)1 - 1

23 C507KR

Z108Anti-Lock BrakeSystem ECU

K LG

13 14 C116R LHDC116L RHO

Z132Engine ControlModule (ECM)

PR GR

C57117 16 C121

KR LGR

42 27 C572

Not used

C506--10( C106lLGR

9

Z253Heating Ventilationand Air Condition-ing Control Unit(HEVAC)

C10216 C20215

DieselPetrol

6 7 C246B

2 [-lC246A1KR LGR

KR LGR

Z253Heating Ventila-tion and Air

....................., ConditioningControl Unit(HEVAC)

KR LGR

With Air Condi-tioning

Without AirConditioning


KR8f-17J'C255

LGR ~!_L_G_R _

5214 J5213.._----- -------_...7L~5 C231

X318Data Link Connector(OBDII)

CIRCUIT DIAGRAM

CIRCUIT OPERATION

Engine Coolant Temperature Gauge

The engine coolant temperature gauge sensor hasthe capability to sense from -40C to +130C. Petroland Diesel resistance valves are different.

Both Petrol and Diesel sensors are interfaced to theInstrument Cluster (Z142) via the BeCM (Z238). Theresistance value then being represented by an AIDdata transfer generating the required angulardeflection on this gauge. [AID = Analog to Digital]

Fuel Gauge

When the fuel tank level is low ("E"), the resistancevalue of the gauge sensor is 27011 for petrol anddiesel engines. As the fuel level increases, theresistance of the sensor decreases. When the fueltank is full, the resistance value of the sensor forpetrol engines is 1911 and for diesel engines 25.811 .When the fuel gauge sensors resistance valueincreases to 17511 (9 liters/2.25 US gallons, the lowfuel warning light will illuminate to warn of the fuelstatus. Both Petrol and Diesel sensors are interfacedto the Instrument Cluster (Z142) via the BeCM(Z238). The resistance values then beingrepresented by an AID data transfer generating therequired angular deflection on the gauge.

Speedometer

The signal to activate the gauge is originated at theABS wheel sensors, transmitted to the ABS ECU(Z1 08) which then puts out a usable signal to theInstrument Cluster (Z142) of 8000 pulses per mile or4972 pulses per kilometer. The signal is alsotransmitted to other ECU's, such as the EngineControl Module (ECM) (Z132) and the Cruise ControlECU (Z121).

Tachometer

The tachometer will display the engine speed inRPM. It will derive the engine speed from theengine speed pulse train transmitted from the EngineControl Module (ECM) (Z132).

The pulse rate for petrol engines will be 4 pulses perengine revolution.

The pulse rate for diesel engines will be 3 pulses perengine revolution.

INSTRUMENTS IIIAudible Warning

Receipt of an audible warning request signal from avehicle parameter/message condition shall cause theBeCM (Z238) to generate the required number ofwarning tones. The actuator sounder unit is locatedat the rear of the Instrument Cluster (Z142).

See message listing for categories/priority and levelsof audible warnings.

CIRCUIT OPERATION

III INSTRUMENTS

1---"30--1 Z2381fP'\ ~1 1 Body Electrical1~ 10 A 1 Control ModuleL___ _ __I (BECM)

7' C258I See Fuse DetailsIIr;---e S205

14L ~1 ;242r----- ---- -----------------------1 Z142

~[1] ~I~~~e~ent

[1] Speedome-ter

---- ----- - - --------- [15] Control

fP'\ 1[15] Unit and~ 1 Message_____ ...J Centre Dis-

play

17 7 8 18 2 12 3 13 5 15 9 C242 Z108

1---1 Anti-Lock Brake1 1System ECU1 11 1

B B BG BG RG RG OG OG LG LG L I28 C116R LHD

C116L RHD

Y YG

14 _5 2 10 1 9 ..J1 3 16 C256 11 C1141----------------------------1 Z2381 fP'\ 1Body Electrical1 ~ 1Control Module-----------------------------1 (BECM)

CIRCUIT DIAGRAM

INSTRUMENTS III

IExcept NASNAS

III INSTRUMENTSI 1Z142I IIP\I I Instrument1 \:y [4] 1Cluster1 I[4] Tempera-1_______ ture Gauge

:-"--------'--. Z238Body ElectricalControl Module(BECM)

Petrol

19I~114

Diesel

8C106

C506

up to model year97

12C121

C571

from model year98

1 C519 1 C588 1 C588X114 X114 X114

1j,- Engine Coolant

1].!"'Engine Coolant

1!"'"Engine Coolant

Temperature Temperature TemperatureGauge Sensor Gauge Sensor Gauge Sensor

2 C519 2 C588

B B

6C571

C121

5505. 5115 i

I II E529 E167D

CIRCUIT DIAGRAM

CIRCUIT OPERATION

All warning Indicators are controlled by Data sent tothe Instrument Cluster (Z142) from the BodyElectrical Control Module (BeCM) (Z238). All data istransmitted via the serial data lines. The BeCM(Z238) will provide data based upon input fromvarious sensors.

Some warning lights may also be accompanied by amessage which will appear in the message centredisplay on the instrument pack.

Service Reminder Indicator (SERVICE ENGINE)

Illuminates briefly (for 3 seconds) as a bulb checkwhen the Ignition switch is turned to position II.

Illuminates continuously when the vehicle reaches50,000 miles (80,500 km) approx.

Low Fuel Warning Indicator

Illuminates briefly (for 4 seconds) as a bulb checkwhen the Ignition Switch is turned to position II.

When the fuel gauge sensors resistance valueincreases to 175Q (9 liters/2.25 US gallons, the lowfuel warning light will illuminate to warn of the fuelstatus. Both Petrol and Diesel sensors are interfacedto the Instrument Cluster (Z142) via the BeCM(Z238).

High Temperature Warning Indicator

Illuminates briefly (for 4 seconds) as a bulb checkwhen the Ignition switch is turned to position II.

The engine coolant temperature gauge sensor hasthe capability to sense from -40C to +130C. Petroland Diesel resistance valves are different.

Both Petrol and Diesel sensors are interfaced to theInstrument Cluster (Z142) via the BeCM (Z238).

Malfunction Indicator Lamp (CHECK ENGINE)

Illuminates briefly when the Ignition Switch is turnedto position II as a bulb check and extinguishes whenthe engine is running. Illumination at any other timesindicates an engine fault.

Both Petrol and Diesel Engine Control Modules(Z132) are interfaced to the Instrument Cluster(Z142) via the BeCM (Z238).

WARNINGS AND INDICATORS mOil Pressure Warning Indicator

Illuminates as a bulb check when the Ignition switchis turned to position II, and extinguishes when theengine is running.

The Oil Pressure Switch (X149) is closed with LowOil Pressure.

Both Petrol and Diesel switches are interfaced to theInstrument Cluster (Z142) via the BeCM (Z238).

ASS Warning Indicator

This light illuminates for approximately 1 secondwhen the Ignition switch is turned to position II, andthen briefly extinguishes before coming on again.The warning indicator will then remain illuminateduntil the vehicle is driven above approximately 5 mph(7 km/h). If the light does not extinguish orilluminates again then a fault has occurred with theABS system.

If the light remains illuminated once a speed of 5mph (7km/h) has been reached, or subsequentlyilluminates whilst driving, a fault has been detectedby the self-monitoring system. The message centrewill display 'ABS FAULT'.

The ABS System is interfaced to the InstrumentCluster (Z142) via the BeCM (Z238).

CIRCUIT OPERATION

mWARNINGS AND INDICATORSETC Warning Indicator (TC)

Illuminates for 3 seconds after the Ignition switch isturned on and the ABS and traction control systemshave completed their self-checks.

Whilst driving, the TC light will illuminate (for aminimum of 2 seconds) whenever traction control isactive; the light extinguishing as soon as tractioncontrol ceases. The light flashing (for at least 10seconds) indicates that the system has beenover-used; it will be available again once the systemcomponents have cooled.

If the light illuminates continuously, a fault with thesystem is indicated.

The ABS System is interfaced to the InstrumentCluster (Z142) via the BeCM (Z238).

Brake Warning Indicator

Illuminates for 3 seconds as a bulb check when theIgnition switch is turned to position II and alsoilluminates when the handbrake is applied and theIgnition switch is in position II.

The light should extinguish when the handbrake isfully released or after the bulb check if thehandbrake is off. If the light illuminates whilst driving,a fault is indicated.

NOTE: If the vehicle has been standing for sometime, it may take up to 40 seconds before the lightextinguishes (in this case, ABS and TC warninglights will also be illuminated).

The Brake System and Handbrake Switch (X191)are interfaced to the Instrument Cluster (Z142) viathe BeCM (Z238).

Cruise Active Indicator

When the Cruise Control System has been activatedthe indicator will be illuminated. The Cruise Systemis interfaced to the Instrument Cluster (Z142) via theBeCM (Z238).

Charge Warning Indicator

Illuminates as a bulb check when the Ignition switchis turned to position II and extinguishes when theengine is running and the Generator (Z1 06) isproducing normal power. If the Generator (Z1 06) isnot producing normal power or the Generator (Z1 06)stops turning the indicator will illuminate.

Both Petrol and Diesel Generators (Z1 06) areinterfaced to the Instrument Cluster (Z142) via theBeCM (Z238).

CIRCUIT OPERATION

Fasten Seat Belt Indicator

Illuminates for 6 seconds when the Ignition switch isturned to position II. When the driver's seat belt isbuckled, the indicator turns off.

The Driver's Seat Belt Switch (X120) is interfaced tothe Instrument Cluster (Z142) via the BeCM (Z238).

Air Suspension Indicator

Illuminates as a bulb check when the Ignition switchis turned to position II and remains illuminated until 2seconds after the engine has started.

In addition, the light will illuminate whilst drivingwhenever 'High' or 'Extended' ride heights areselected, and also if a fault with the air suspensionsystem is detected.

The air suspension system is interfaced to theInstrument Cluster (Z142) via the BeCM (Z238).

Lights "ON" Indicator

This light illuminates when the sidelights and/orheadlights are switched on. It will not illuminate whenparking lights or headlight delay are in operation.

The Main Light Switch is interfaced to the InstrumentCluster (Z142) via the BeCM (Z238).

Direction Indicators

The left or right warning indicator flashes in time withthe corresponding left or right direction indicatorlamps whenever they are operated. A warningindicator flashing twice the normal speed indicatesthat a direction indicator lamp bulb has failed (themessage centre will indicate which bulb is faulty). If atrailer is connected and a rear indicator lamp bulbfails then the message will not be displayed. Whenthe hazard switch is pressed, both warning indicatorswill illuminate in conjunction with the indicator lamps.

The Direction Indicator switches are interfaced to theInstrument Cluster (Z142) via the BeCM (Z238).

Main Beam Indicator

This indicator illuminates whenever the main beamheadlights are on.

The Main Beam Switch is interfaced to theInstrument Cluster (Z142) via the BeCM (Z238).

Trailer Indicator

This indicator is only operative when a trailer isconnected to the vehicle via a multi-pin socket. Theindicator flashes in conjunction with the vehicledirection indicator lamps, thus confirming that thetrailer indicator lamps are operating correctly. In theevent of a failure of a trailer direction indicator lamp,the warning indicator will not illuminate.

The Trailer Auxilliary Socket is interfaced to theInstrument Cluster (Z142) via the BeCM (Z238).

WARNINGS AND INDICATORS mGlow Plug Indicator

This indicator illuminates when the Engine ControlModule (Z132) activates the Glow Plug Timer Unit(Z135).

The Engine Control Module (Z132) is interfaced tothe Instrument Cluster (Z142) via the BeCM (Z238).

Catalyst Warning Indicator (Japan Only)

This indicator illuminates when a fault in the catalystsystem is detected.

The Catalyst Overheat Sensors (X299, X300) andthe Catalyst Amplifier (X301) are interfaced to theInstrument Cluster (Z142) via the BeCM (Z238).

Audible Warning

Receipt of an audible warning request signal from avehicle parameter/message condition shall cause theBeCM (Z238) to generate the required number ofwarning tones. The actuator sounder unit is locatedat the rear of the Instrument Cluster (Z142).

See message listing for categories/priority and levelsof audible warnings.

CIRCUIT OPERATION

mWARNINGS AND INDICATORS1------1Z253I I?\ 1Heating Venti la-1 \::y 1tion and Air1 1Conditioning-------' Control Unit

''I~246B (HEVAC)

1------1 Z2531 I?\ 1Heating Venti la-1 \::y 1tion and AirI 1Conditioning-------' Control Unit

'I~246A (HEVAC)

With Air Condition-ing

Without Air Condi-tioning

Interior Lamps

30A E2-5

r-----lcil----L _ _

,...------ -----..... -~'[15]11__.J

....17 7

B --l~I:EI:E~l-J8 18 2 12 3 13 5 15 10 C242

B BG BG RG RG OG OG LG LG BK

14 5 2 10 1 9 11 3 15 C256r-------------------""i Z2381 I?\ 1Body ElectricalI \::y 1Control Module1 1(BECM)____________________ J

CIRCUIT DIAGRAM

WARNINGS AND INDICATORS m

mWARNINGS AND INDICATORSZ142InstrumentCluster[15] Control

Unit andMessageCentre Dis-play

-' 0-- -,- Z238Body ElectricalControl Module(BECM)

Petrol r---119 5 C114

G BY Petrol

WU Diesel

Diesel

X114Engine CoolantTemperatureGauge Sensor


1 C588

up to model year97

G WU

12 15 C121

C571

4 C5721 IZ1321 IP\ 1Engine Control1~ IModule (ECM)1 -


2 C588

B

C571

C121

I~ E167

6

5115

11c588

from model year98

41 C106B 41 C106~C506B C506A

221c505r---IZ132

I !~:?~~d:~;-I (ECM)

8 C106C506

1 C519

2F'95505---....

1E529 CIRCUIT DIAGRAM

mWARNINGS AND INDICATORS

r--------------------------------

r---IZ1061 1Generator

1 D+ I1- __

Not used

3

NY

C506C106

30 30

r---IZ1061 1Generator

1 D+ I1-1--

NYS573

INY

25 C571C121

Z142InstrumentCluster[15] Control


Starting andCharging

Petrol

I Diesel15 C114r--------------------------------, Z2381 I?\ 1Body Electrical1 \:y 1Control ModuleL J (BECM)

19 ::6 8(BTu:l~:42 C606 ll"

Air Suspension

o [1]

1 C606

II See Ground Dis-tribution

I~ E621

CIRCUIT DIAGRAM

30 30 30Z142InstrumentCluster[15] Control

Unit andMessageCentreDisplay

11rs~-J~~423[ 4 C236

'Z---Z--I X2731 [8] [7] 1Direction10 -1 0"-1 1 Indicator1__.:=r=_.J [7] Mode

81 ~236 [8] Overspeed

S215-I See GroundI DistributionII.. E252

1'------------------------------1 Z2381 I?\ 1Body Electrical1 ~ 1Control ModuleL .J (BECM)

12r-~ C256 7r-~-a,r12[-------3[----lC257

RB ~ RLG GR ~ GW~ US ~ UW ~ U OR

. ','

REV: 07/98

DirectionIndicator Lamps

Headlamps

'--------,>CIRCUIT DIAGRAM


Z142InstrumentCluster[6] SRS Indi-

cator 1[7] SRS Indi-

cator 2[15] Control


-J:---

Q9 [6]

NAS

115----1 P125a1 ~F 23 1Engine Com-1 10 A 1partment Fuse1 JBox

31~175See Fuse Details

810:jO

~~~

1 C402r-------------------------- -----f').... 30 30 Japan onlyE2-

9V 1 1 IIIQ9J;lQ9[]I]~

I ~ L ~ _

I L _

[----J3 5 C40214 P .J.2 ~4011--------. Z1511 I?\ 1Air Bag Diagnos-1 \::y 1tic Control Mod-L J ule

[----J3 5 C40213 P --:12 ~4011--------. Z1511 I?\ 1Air Bag Diagnos-1 \::y 1tic Control Mod-L J ule

1'--------------------------, Z2381 I?\ 1 Body Electrical1 \::y 1 Control ModuleL J (BECM)

3lC323 5lC361 15C-3fS;1~1~1~25RB GN GY ~ RY~RY~GR ~GP~ GP~RW~RW

,

Trailer AuxiliarySocket

CIRCUIT DIAGRAM


Z238Body ElectricalControl Module

................. (BECM)6 C626

GB

4 C112

BP

1 C114

YB

3 C255

NW

1C660

C560

2 C164

X108Automatic Trans-

0 1mission Oil Tem-perature Switch

1 C233

X229Key-In Switch

[1] Key Inserted

2 C192B

5122I See Ground Dis-I tributionII.. E181

1 C164

B

5110

; ~7~u~~~und Dis-

II.. E154

1 C565

~11 I K~1;'~t~~:O;'11~566

5551I See Ground Dis-I tributionII.. E529

CIRCUIT DIAGRAM

1 C192

o 1

2 C233

B

5215

; ~7~u~~~und Dis-

II.. E252

D

_______________________H_O_R_N_S iii

DE252

See Ground Dis-tribution

PB

5 C235

B

S215 iIII..

LGR

4 C247

r-Z---IX2691 [8] 1Steering Wheel1 0 - L-.. 1Switches1 .:r:=...1 [8] Horn

6 C247

PB

---IZ119I Rotary Coupler

I

1 C196 K134

~ R;gh'Horn

21:96S111

I See Ground Dis-I tributionI1 E181

1 C161 K128

~ LeftHorn

2J:'61

S101 i See Ground Dis-I tributionII.. E154

p--------------------------------n P125a30 Engine Compart-

30~~~ !61 ;:n'::;::e~:y[Zl----------------------:m ~~9

L_~~_Jl~~~~====~~~~~-~~~~l ~5 7 ------------------J:~:

1- - - - - - I Z238PB PB1 I?\ 1Body Electrical1 \.::y 1Control Module1 ...1 (BECM)

17 C257

PB4 C235

LGR

---I Z119I Rotary Coupler

I

CIRCUIT DIAGRAM

_______________________R_A_D_IO mCIRCUIT OPERATION

Battery Voltage is provided to the radio at all timesthrough the P wire. In addition to the anti-theftfeature, this input voltage keeps the preset stationmemory alive. Whenever battery power to the unit islost, the anti-theft code must be entered and thepreset stations must be reprogrammed.

When the Radio (Z111) and the igntion are turnedon, the voltage signal through the WK wire to thecontrol head 'wakes up' the unit. The Radio (Z111)plays, the LCD display comes on and the controlbuttons illuminate. On some models, when the parklamps or headlamps are turned on, a voltage signalis sent through the RW wire to dim the LCD displayand control buttons for night driving.

Radio (Z111) signals are received via a coaxial cablefrom the side screens and antenna amplifiers. Theamplifiers filter and boost the signal from the sidescreen, using power supplied on WO wires,whenever the Ignition Switch (X274) is in position Ior II.

The CD Changer (Z114) is permanently suppliedwith power through the P wire via the radio and aDIN cable.

For the new Range Rover, three levels offactory-fitted in-car entertainment are available.

The mid/low line radio has the following features:Electronically tuned AM/FM cassette radio (Z111),RH antenna amplifier (Z178) for AM/FM signals and6, 8 or 10 speakers.

The high line (NAS/JAPAN) radio has the followingfeatures: Electronically tuned AM/FM cassette radio(Z111), RH antenna amplifier (Z178) for AM/FMsignals, LH antenna amplifier (Z177) for FM signalsonly, 4 door speaker amplifiers (Z241 , Z242, Z245,Z246), a subwoofer amplifier (Z176), a CD changer(Z114) and 10 speakers plus a subwoofer speaker(K146).

Subwoofer

The subwoofer amplifies frequencies between 20and 150 Hz to give an enhanced bass sound.

Subwoofer Amplifier

The Subwoofer (K146) is supplied with power andground from the Subwoofer Amplifier (Z176) via twoseparate channels which consist of 4 BW/B wires.The subwoofer amplifier (Z176) is permanently

supplied with power on the P wire, but it is onlyswitched on when the radio supplies a signal on theSB wire.

Speaker Amplifier

The Speaker Amplifiers (Z241 , Z242, Z245, Z246)are situated in the 4 doors and are supplied withpermanent power via the P wire. They are switchedon when the radio sends a signal on the SB wire.The speaker amplifiers (Z241 , Z242, Z245, Z246)have one channel for the bass speakers (K202,K203, K209, K220) and a second for the midrangespeakers (K200, K201, K2111, K212) and tweeterspeakers (K197, K198) (front doors only). Thetweeter incorporates a capacitor to filter the signals.

CIRCUIT OPERATION

m_R_A_D_I_O _Side Screen Antenna

The antenna is printed into the rear side screen. ForNAS and Japan, the element is fitted in both rearside screens. This is referred to as a diversityantenna system. Other markets have a singleelement in the right hand screen only. Diversityreception means that as vehicle movement results inloss of signal due to reflections from buildings(known as multipath distortion), the radio will switchto the antenna receiving the strongest signal. Thisresults in less interference and better stereoperformance.

Antenna Amplifier

Antenna amplifiers are in the LH and RH side of theluggage compartment behind trim panel.The FM andAM amplifier would be located on the right handside, and the FM only amplifier is located on the lefthand side.

Speakers

Trim level 1/2 - The low/midline radio is equippedwith 6, 8 or 10 speakers fitted in the doors. Themidrange speakers (K200, K201, K211, K212) arefiltered by capacitors in the wires (K239, K240,K247, K248) and the tweeter speakers (K197, K198)filter the signals by built-in capacitors.

Trim level 3 - the high line is equipped with 10speakers like the trim level 1/2, but they all receivepower and ground via 4 additional speakeramplifiers. The signals for the tweeter speakers(K197, K198) are filtered by their internal capacitors,similar to the mid/low line tweeters.

CIRCUIT OPERATION

RADIO (LOW LINE) mLow Line Radio

r---------------------------------.Z238

30 30 Body ElectricalF 1 F 8 Control Module10 A 30 A (BECM)

.....-t------+---,RL 7

Z178Right AntennaAmplifier

81ght Sidendow Antenna

- -IIIP\II\::YI1__ - .J

------------5 C325Z1

~Ri

WO Wi

1 C318

~

WK

C258

S212_

lHeating andVentilation

RW

r----- S210I I

P I r-- S209~ ~

Interior Lamps

r-l C340.-- ,~.... Coaxial Cable

I -I- I1- -~4 6 7 C226 [J::

r------------------------------lz111

I IP\ IRadioI \::Y IL ~

8IC226Up to VIN 359268 From VIN 359269

I..... _

r-------2 6

7 I See Fuse DetailsII- S205

I B- S208

II See GroundDistribution

I.. E252

B

.. E361

REV: 07/98 CIRCUIT DIAGRAM

mRADIO (LOW LINE)Low Line Radio

6 5 4 3YB Y RB

C207

2 1 C357 2 1

----8

R

C208

C308 4

7 2GB G

C207

3 C357 4

Z111Radio

1 C224A

UB UC208

3 C308

2

C351

1 C751L 2

RB R

C301

1 C751R 2

C353

1 C703L 2

UB U

C303

1 C703R

YB Y GB

2 C711L

$JK209Left Rear BassSpeaker

1 C711 L

S751 Re--------..21c765R_ K203

~ :~~:t::':~er1 C765R

K197Left FrontTweeter

21c769R,....-~~--.,K198

Right FrontTweeter

21c769L

S752R e---

S751Le--------...21 C765L$J ~::::rnt Bass1 C765L

e ..S7..5.2.L_

CIRCUIT DIAGRAM

RADIO (MID LINE) m

mRADIO (MID LINE)

RADIO (MID LINE) m

2 C769R

1 C769R1 C759R

~ ::~~~~;nt2 C759R Speaker

Z248Right FrontMidrange

....................... Filter Capaci-tor

2 C765R

~ :~~:t:;:~er1 C765R

CIRCUIT DIAGRAM

mRADIO (HIGH LINE)

RADIO (HIGH LINE) m

mRADIO (HIGH LINE)~ I High Line Radio~r-----

Horns

PB

r---IZ111I I?\ IRadioI ~ II .J

3 C226

SO

r - - - - - - - -., Z249I I Cruise Control Con-I I verterllnverter Mod-I I uleI..... J

6 5 C241P Petrol

C241D Diesel

YR YS

2 C235

R

---IZ119I Rotary CouplerII

W

___________1

Y

4 3

LGR

III1_-

4LGR

5Y W R

2 3 C247

[7]

IK177 ,Driver's Aor Bag

1 C4092

PB

C247

390 Q 4.7 kQ 4.7 kQ 15 kQ

6

X269Steering WheelSwitches

[1] Increase[2] Decrease[3] Mode Select[4] Volume Up

.................................""""'"Iill'.ooo.o [5] Volume Down

[6] ResetlDecel[7] Set/Accel[8] Horn

-'""'IZ119I Rotary CouplerII

PB

5 C235

B

S215

II See Ground Dis-tribution

I.. E252

2 1 C410R Y

16 17 C401-----------IZ151I I?\ [Alr Bag Diagnos-I ~ I tic Control Mod-I J ule

CIRCUIT DIAGRAM

RADIO (HIGH LINE) m

mRADIO (HIGH LINE)

SB

C207

C3577

C226

SB

5-----

R

C224B 23

1

RB

4

2

PB

RADIO (HIGH LINE) m

mRADIO (HIGH LINE)

RADIO (HIGH LINE) m

OB 0 SB SB

6 5 -----~ C207 5 C208C357 C308

S352.,

OB 0 , ,

m_R_A_D_I_O _TROUBLESHOOTING HINTS

3. Check fuses F1, F8, F9, F14 and F15 of BeCM(Z238).

4. Check that Radio (Z111) connectors and coaxialcable are tight and properly connected.

5. For proper Radio (Z111) noise diagnosis, takethe vehicle outside where signals are strong.Close the hood and keep away from metal buil-dings or other sources of Radio interference.

6. If Radio (Z111) noise is excessive when an ac-cessory is on, install a radio noise suppressioncapacitor to the power lead of the accessory.

7. If Radio (Z111) noise is excessive at all times,check antenna wiring, side screen antennas andantenna amplifiers. If OK, check speaker plugs,spark plug wiring and wiring close to the ignitionsystem which could transmit noise to the Radio(Z111) wiring.

8. If only the CD Changer (Z114) does not operate,check DIN cable. If OK, check Radio and CDChanger (Z114).

9. If the Radio (Z111) is inoperative and displayseither CODE (low line) or CODE IN (all others),follow the instructions below.

Security Code Instructions

Low Line (PRC7613)

Obtain the 4 digit security code from the customer'ssecurity card or, if they have lost it, from themanufacturer.

1. Press the preset 1 button once.

2. Using the arrow up and arrrow down buttons,change the - to show the first digit of the code.

3. Press the preset 1 once.

4. Repeat steps 2 and 3 for digits 2, 3 and 4.

5. When the preset 1 button is pressed after thefourth digit, operation should be restored.

If the wrong code is entered, the word WAIT willappear. Do not switch off. Wait until CODE appears,then try again. The time delay will increase eachtime an incorrect code is entered.

All others (PRC7617, PRC7618, AMR2672)

Obtain the four digit security code from thecustomer's security card or from the manufacturer.

Enter the code using the preset buttons (1 to 6).When the final digit is entered, the radio shouldreturn to full operation.

TROUBLESHOOTING HINTS

If the wrong code has been entered, the display willshow the number just entered, instead of thefrequency. This must be cleared by pressing andholding the BAND button for 5 seconds. The displaywill then revert to CODE IN, and the code should beentered.

If the wrong code is entered more than THREEtimes in succession, the code can no longer beentered. Units PRC7617 and PRC7618 will show-. When this clears, input the correct code. UnitAMR2672 will allow the code to be entered, but willnot respond even if the code is correct. If thishappens, leave the set switched on for at least onehour without touching any controls. After waiting thistime period, try again.

_________________________R_A_D_IO_ mSYSTEM DIAGNOSIS

1. If Radio (Z111) does not operate at all, do Test A.

2. If Radio scans past all frequencies when in seekmode and hiss is present over most stations, doTest B.

3. If VF display does not dim when headlamps orpark lamps are turned on, do Test C.

4. If one or more speakers do not operate, doTest D.

5. If the Subwoofer (K146) does not operate, doTest E.

6. If all right rear door speakers do not operate, doTest F.

7. If all left rear door speakers do not operate, doTest G.

8. If all left front door speakers do not operate, doTest H.

9. If all right front door speakers do not operate, doTest I.

10. If none of the steering wheel switches to the ra-dio operate, do Test J.

TROUBLESHOOTING HINTS

m_R_A_D_I_O _TestA

CONDITIONS Ignition Switch

Position: I

RESULTSBAT VOLT

~ PROBLEM CAUSE\JI -P Wire

- WK Wire

- Fuse F1

- Body Electrical Con-trol Module (BECM)

b]J )---- Jf..

,eCD$- --~--l DC226

~ i G:J~~~;,WK ->L ---"

Z111Radio

2A

2A


Position: I

RESULTSBAT VOLT

WK

B

C226

Z111Radio

)D

@ PROBLEM CAUSE- B Wire

TROUBLESHOOTING

PROBLEM CAUSE

- Radio

_________________________R_A_D_IO_ m)D

C318C364

WO

[Y]---------

CD,81-+++G)-----I~ 1


Position: I

RESULTSBAT VOLT

Test B

Antenna Am-plifier(s)

~ PROBLEM CAUSE\JI -WO Wire

- Fuse F8


PROBLEM CAUSE

- Coaxial Cable

- Radio

- Antenna Amplifier(s)

Test C

1C


Position: /I Headlamps

On

RESULTSBAT VOLT

[Y]---------

CD RW

)D

Z111Radio

@ PROBLEM CAUSE- RW Wire


PROBLEM CAUSE

- Radio

TROUBLESHOOTING

m_R_A_D_I_O _Test D

10

CONDITIONS Connect for less than 1 second

Connect at suspect connector

RESULTSSpeaker 'pops' Speaker

),D

PROBLEM CAUSE

- Speaker

PROBLEM CAUSE

- Speaker Wiring

Low Line Radio and MidLine Radio:

- Radio

High Line Radio:

- Amplifier

1E

Test E


Position: I

RESULTSBAT VOLT Z176

Subwoofer Am-plifier

CYJ---------CD

C377

=

1 2 3

)D

8 9 10

TROUBLESHOOTING

PROBLEM CAUSE

- R, P Wire- Fuse F15- Body Electrical Con-

trol Module (BECM)

2E

_________________________R_A_D_IO_ m


Position: /I

RadioOn

RESULTSBAT VOLT

~ PROBLEM CAUSE\JI -B, SB Wire

Z176Subwoofer Am-plifier

3E

B

)D

3E


Position: 0

RESULTSLess than 1 ohm Z176

Subwoofer Am-plifier

@ PROBLEM CAUSE @- B Wire

4E

B)D

TROUBLESHOOTING II

m_R_A_D_I_O _


Position: 0

RadioC2248 Disconnected

RESULTSMore than 10K ohms

Z176Subwoofer Amplifier

1

BI1

11 1 2 3 4 5 6 7 8 /9 10L J

~ PROBLEM CAUSE\JI -BW, 0 Wire

- B,OB Wire

5E


C224B B

~~c::::l~~

c:9~~c::L:J9

Z111Radio

)D

RESULTSOQ


Position: 0

5E

@ PROBLEM CAUSE- BW,O Wire

6E

TROUBLESHOOTING

_________________________R_A_D_IO_ m


Position: 0

RESULTSOQ

)DC224B

~c6J~~lO[::1~::](:::~00~

Z111Radio


~ PROBLEM CAUSE\JI -B, OB Wire


Position: /I Install a known good Subwoofer

RadioOn

RESULTS Subwoofer Speakers

Operate

7E

@ PROBLEM CAUSE- Radio

- Subwoofer Amplifier

PROBLEM CAUSE

- Subwoofer

TROUBLESHOOTING

m_R_A_D_I_O _Test F

1F


Position: I

RadioOn

RESULTSBAT VOLT

~ PROBLEM CAUSE\JI -P, SB Wire

- Fuse F15

[Y]---------

(])

Z246Right Rear Door Speaker Am-plifier

)D


2F


Position: 0

RESULTSLess than 1 ohm


TROUBLESHOOTING

2F

Z246Right Rear Door Speaker Am-plifier

3F

_________________________R_A_D_IO_ m

Z246Right Rear DoorSpeaker Amplifier


Position: 0

RESULTSOQ

)D

UB

Z111Radio

GB )~D

~ PROBLEM CAUSE\JI -UB, GB Wire

4F

4F


Position: 0

RESULTSOQ

)D

C224B U

~C&:][:~:l~~

~~0~

Z111Radio

Z246Right Rear DoorSpeaker Amplifier

@ PROBLEM CAUSE- U, G Wire

PROBLEM CAUSE

- Radio

- Right Rear DoorSpeaker Amplifier

TROUBLESHOOTING

m_R_A_D_I_O _TestG

1G


Position: I

RadioOn

RESULTSBAT VOLT

[Y]---------CD

=Z245Left Rear DoorSpeaker Amplifier

)D

~ PROBLEM CAUSE\JI -P, SB Wire

- Fuse F15


2G


Position: 0



TROUBLESHOOTING

2G

Z245Left Rear DoorSpeaker Amplifier

3G

)D

_________________________R_A_D_IO_ m



Position: 0

RESULTSOQ

)D

C224B

0~c:::::l8~C:!~:][::~c:::::l c::L:Jc:gJ

Z111Radio

GB )~D

~ PROBLEM CAUSE\JI -GB Wire

4G

4G


Position: 0

RESULTSOQ

Z111Radio

)DC224B

G


@ PROBLEM CAUSE- G Wire

PROBLEM CAUSE

- Radio

- Left Rear DoorSpeaker Amplifier

TROUBLESHOOTING

m_R_A_D_I_O _Test H

1H


Position: I

RadioOn

RESULTSBAT VOLT

~ PROBLEM CAUSE\JI -P, PB, SB Wire

- Fuse F9

- Left Front DoorOutstation

2H


Position: 0



TROUBLESHOOTING

Z241Left Front DoorSpeaker Amplifier

2H


3H

)D

)D

_________________________R_A_D_IO_ m


Position: 0

RESULTSOQ

)D0c::5J~~~0~[:::::][::L:Jc:gJ

Z111Radio


~ PROBLEM CAUSE\JI -YB Wire

4H

@ PROBLEM CAUSE- Y Wire

PROBLEM CAUSE

- Radio

- Left Front DoorSpeaker Amplifier

TROUBLESHOOTING

m_R_A_D_I_O _Test I

11


Position: I

RadioOn

RESULTSBAT VOLT

~ PROBLEM CAUSE\JI -P, PB, SB Wire

- Fuse F9

- Right Front DoorOutstation

[Y]---------CD

=

Z242Right Front DoorSpeaker Amplifier

21

)D

21


Position: 0



TROUBLESHOOTING


31

)D

_________________________R_A_D_IO_ m



Position: 0

RESULTSOQ

)D

Z111Radio

YB )~D

910

~ PROBLEM CAUSE\JI -RB, YB Wire

41

41


Position: 0

RESULTSOQ

)D

C224B R

Z111Radio


@ PROBLEM CAUSE- R, Y Wire

PROBLEM CAUSE

- Radio

- Right Front DoorSpeaker Amplifier

TROUBLESHOOTING II

m_R_A_D_I_O _Test J

1J


Position: 0


~ PROBLEM CAUSE\JI -PB, B Wire

- Rotary Coupler

C247

DDDDD

7 6 5 4 3 2X269Steering WheelSwitches

2J

)D

7 6 5 4 3 2X269Steering WheelSwitches

2J


Position: 0


)D

C226

Z111Radio

y

DD

C247 ;(.JDODD D

@ PROBLEM CAUSE- SO Wire

- Y Wire

- Rotary Coupler

TROUBLESHOOTING

PROBLEM CAUSE

- Radio

- Steering WheelSwitches

CIRCUIT OPERATION

Front Wipers

The front wipers will only operate with auxiliary orignition on, except when auxiliary and ignition areboth turned off, the wipers will continue to operateuntil they reach the park position. If the engine iscranked while the wipers are on, then the wiperoperation will be suspended until cranking isreleased.

Flick Wipe Operation

When the flick wipe switch is operated, the wiper willoperate in the slow wipe mode until the switch isreleased.

Intermittent Operation

When the wiper control stalk is moved to theintermittent position, the wipers will perform one wipeof the screen at slow speed and then wait for Nseconds before doing another wipe etc. The value ofN is determined by the position of the wipe delaypotentiometer. When the potentiometer is in the farleft position the time delay is 2 seconds. Eachmovement of the potentiometer to the right doublesthe time delay, up to a maximum of 32 seconds.

Slow Speed Operation

When the wiper control stalk is moved to the slowposition, the wipers will operate continuously at slowspeed.

Fast Speed Operation

When the wiper control stalk is moved to the fastposition, the wipers will start operating at fast speedimmediately and will continue to do so until fastspeed is switched off.

Front Screen Programmed WashlWipe

If the wash/wipe switch is operated, the front screenwash motor will operate for 1.5 seconds or for theduration the switch is held on, whichever is thelonger.

The slow front wipe will be operated for 0.5 secondsafter the switch is closed and will continue to operateuntil three full wipes have been completed after thewash motor has ceased it's operation.

Rear Wiper

Intermittent Operation

When the rear wiper stalk is moved to the "on"position, then the rear wiper will perform twocomplete wipes and stop in the park position. After

WASHIWIPE mthat, its operation will vary depending on theselected mode of the front wipers.

Reverse Gear Wiping

If reverse gear is selected while auxiliary or ignitionis on and a front wiper function is selected, then therear wiper will operate as well.

If reverse gear is selected while the front wipers areoff (or performing a wash/wipe cycle) then the rearwiper will operate in the mode indicated by the rearwiper switch.

Rear Screen Programmed WashlWipe

If the rear wash/wipe switch is operated, the rearscreen wash motor will operate for 1.5 seconds orfor as long as the switch is held on, whichever is thelonger. The rear wipe will be operated 0.5 secondsafter the switch closed and will continue to operateuntil three full wipes have been completed after thewasher motor has ceased it's operation.

Wiper Operation With Speed Dependency On

If the vehicle has speed dependent wipers, the wiperadapts its speed to the vehicle speed.

The speed barrier, where the wipers move betweena faster or slower operation, is 2 mph.

Headlight WashlWipe

If the headlight switch is in the on position, the firstand every alternate operation of the front screenwash switch will activate the headlight wash/wipemotor, which will operate for 2 seconds, regardlessof the length of time the switch is pressed.

CIRCUIT OPERATION

iii WASHIWIPE

28IC116RC116LYG

11 C114

Z108Anti-Lock Brake Sys-tem ECU

LHDRHD


C237

C257131C120

LGB

1 C193

I ~ I:;;~ ~~~~nLGB 21 ~'93

i S111I See Ground Dis-I tribution.. E181

8

1

OB

B

1

13

6 C237

LGO

S207r-.. E252

4

4

OP

3

11

ULG

5

15

RLG

5

WG

7

1 =Switch Closedo=Switch Open

16

81 82 83

Mist 1 0 0

Off 0 0 0

Intermittent 0 1 0

Slow Wipe 0 1 1

Fast Wipe 0 0 1

,....._:---......,---~--~--~--_:---......,--.....,X272

WashlWipe Switch

[1] Front Wipe Switch 1[2] Front Wipe Switch 2

.....----------------.-.-------- [3] Front Wipe Switch 3[4] Intermittent Potenti-

ometer[5] Front Wash[6] Rear Wipe[7] Rear Wash

CIRCUIT DIAGRAM

WASHIWIPE m< Ir-----------;;.-------------'P125a

Engine Compart-F 25 ment Fuse Box20A

4

5 1

I J]RL1~_____ [1J---:C~~~~~ '[] J]RL8-5,---------= [8j

___:c~J[-~====~-l _

[1] Front WiperControlRelay

[8] Front WiperIntervalRelay

[1] Parked[2] Not parked

LHDRHD

M107Front WiperMotor

C175

KLG

C113

-'Z238I Body ElectricalIControl ModuleI(BECM)--

2 8 "'---5 ---------J[----JNLG

7 ____ 8

RLG ULG --------II II1...._------

3 C114

NLG

2 ~--~ ~___________14 C127LC127R

~---------------[1] _ [2]

C127L LHD4

C127R RHD

BRHD LHD,

B

2 C17

5114.--.1I See Ground Dis-I tributionI.. E167

I5113


CIRCUIT DIAGRAM

WASH/WIPE111 _

M156Left HeadlampWiper Motor

[1] Run[2] Park

LGR

6 C113----IZ238

I?\ 1Body Electrical\::Y IControl Module____ (BECM)

31 C~57

4 C219-[---1 X145[2] 1Main Lighting

o -1.-., 1Switch__L""_.J [2] Headlamps

31 C:19

5208 i See Ground Dis-I tribution.. E252

5101 - .I See Ground Dls-I tribution.. E154

---. ---T;r4 C175 5Security/CentraLocking

LGU NU

r111-

5132-r1

adlamp 1tor 1

k

2 ~__ L C160RB YB

[2] -h r [1]

IM

B

4 C160

LGU

M157Right HeWiper Mo

[1] Run[2] Par

4 3 C190

1 C191

[]]

~~~~IampWasM Pump

21 C191B B..._--5111 See Ground Dis-

I tributionI.. E181

B

[[' - - - - -15- - - - - - - - - - - - - - - - - -.., P125a1 F 38 1Engine Compart-1 10 A 1ment Fuse BoxI 1 h11] Headlamps1 1 WashlWipeiQ \L---------------=m~;1 i RelayI 4'--1 01------2)' ILJ::_ __ ___~__JL ~__~

2 C172 1 5 C176

2 1 C190

RB YB

B R

[2] -r--- [1]II

5114 -.See Ground Dis-

I tributionI.. E167

CIRCUIT DIAGRAM

WASHIWIPE m

iii WASHIWIPEZ238Body ElectricalControl Module(BECM)

Manual Trans-mission

GN

8

GN Manual Trans-mission

UB AutomaticTransmission

AutomaticTransmission

UB

9

UP

18 C626

UG

x y ZP 0 1 1

R 0 0 1

N 1 0 1

D 1 0 0

3 0 0 0

2 0 1 0

1 1 1 0

Z* 1 1 1

1 =Switch Open

o=Switch Closed

3 C660C560 * = Fault

Automatic Gear-box

1 C564 S610---- --- --"'11~1I1~11 ~:~:rse Sw;'ch 5609 .--::.:::

2 C564

10C659C559

6 7 C660

C560

B

S551IIIIIIIII E529 Petrol

-:!:- E574 Diesel

CIRCUIT DIAGRAM

6

5

C562

BG

C560

C660

B

i S607I GroundII-:!:- E621

X294Gear Box Posi-tion Switch

[1] X Switch[2] Y Switch[3] Z Switch

D

CIRCUIT OPERATION

This operates only with the engine running, which isdetermined by the HEVAC panel. In the off state, thesignal is at 12 volts. When the Heated FrontWindscreen is activated, the signal is switched to 0volts. This provides the ground required for relay 5 tobe pulled in, as there is an ignition feed on the otherside of the coil provided by relay 15. This relayenergises one half of the heated screen elements.

Once relay 5 has been energised, a 12 volt signal isprovided to the coil of relay 4. The other side of thecoil is connected directly to ground, therebyenergising the relay and switching on the other halfof the elements.

There is also a feed spliced from the harness whichprovides the petrol Engine Control Module with asignal that tells the unit there will be a large electricalload turned on/off.

HEATED FRONT SCREEN m

CIRCUIT OPERATION

ID HEATED FRONT SCREEN,....------------------------------- P125

15 30 30 Engi~e Compart-

T j F 32 F 30 ment Fuse Box30A 30A1 3 [4] Right------ Heated~ }l;~5 ~~:;n~..EJ [5] Left Heated

2 ------JL 3 ~~:n

i [f--------iIJ:~4----- -----~[-~~~~==j----- ----~

B108Heated FrontScreen

3 C172

PLG

1 C130

E199

4 C173

PLG

1 C128

r----IZ132

I I Engine ControlI I Module (ECM)I J

21Ic:~7

I2 C506

C1065102 e-----------------

10IC102C202

Petrol

PG-----1 C~72i 5114IIISee Ground Dis-I tribution

I-:!- E167

7

C102C202

10

Diesel

51 C244r------r-------I Z253

I -----..J-----1 I Heating Ventila-I I ~ I ItionandAirI I Y;ftV @ I Conditioning

PROG I I Control Unit: -2------2-- rHEVAC)10-1 0-1I II J ->

CIRCUIT DIAGRAM

CIRCUIT OPERATION

The rear screen heater will reflect the state of theheated rear screen input from the HEVAC unit at anytime while the SeCM (Z238) is in the active mode.This signal is normally 12V and OVwhen active (Ac-tive Low).

The HEVAC unit will control all timing functions re-lated to the rear screen heater.

HEATED REAR SCREEN 1m

CIRCUIT OPERATION

iii HEATED REAR SCREEN

RL 11

r-----------------------------'Z238

30 Body Electrical15 IP\ F 12 Control Module

\::y 30 A (BECM)

----I1 IP\ 11 \::y 11_..,._-L ~~_______________ _ W

11 C255 2 C324

WB PLG

With Air Condi-tioning

Without AirConditioning 2 C310

C860

D

B

i 5851I See Ground Dis-I tributionIIIIII.. E322

1 C866

ITJ B141Rear Screen1 C8739 C246A

r - - -1----,Z2531 --- --I 1Heating Ventila-1 1 IP\ 1 1tion and Air1 I \::y 1 1Conditioning1 1 IJJJl 1 1Control Unit1 1 ~ 1 1(HEVAC)

I I -~ .I1 oL.. 1 11 1L .J

17 C246Br - - -1--- -'Z2531 --- --I [Heating Ventila-1 1 IP\ [tlon and Air1 1 \::y 1 1Conditioning1 1 IJJJl 1 1Control Unit1 1 ~ 1 1(HEVAC)

I GZL 11 oL.. 1 11 1I..... ....J

CIRCUIT DIAGRAM

ELECTROCHROMIC REAR VIEW MIRROR mZ238Body ElectricalControl Module(BECM)

1 C564 S610----- --- --"'11~11~~11 ~:~:~e 5w;!ch 5609.--::.:::

2 C564


o=Switch Closed

* = Fault

1 =Switch Open

2r~312S306 i

II.. E328

Automatic Gear-box

1 [323 2] C326WP NU

1 3 C312

B110ElectrochromicRear View Mirror

UG

C660

C560

7

18 C626

UP

6C659C559

10

AutomaticTransmission

UB

UB AutomaticTransmission

GN Manual Trans-mission

8 9

GN

C660C560

3

x Y ZP 0 1 1

R 0 0 1

N 1 0 1

D 1 0 0

3 0 0 0

2 0 1 0

1 1 1 0

Z* 1 1 1

X294Gear Box PositionSwitch

[1] X Switch[2] Y Switch[3] Z Switch

D

____2 3 C5621B

6 C562i S551BG

I 5 C560I C660I BI i S607II II II E529 Petrol I..

E574 Diesel .. E621CIRCUIT DIAGRAM

CIRCUIT OPERATION

Dipped Beam Headlamps

Operation of the headlamp switch will activate theLH and RH dipped beam headlamps, regardless ofthe state of the ignition switch.

Headlamp Delay

The term "headlamp" used throughout this section isassumed to be either dipped beam or main beam, asselected by the main beam changeover switch. Thisswitch will continue to function for the duration of thedelay period.

The headlamps will operate when the headlampswitch is set to the headlamp position, regardless ofthe status of the ignition switch.

If the ignition switch is turned off and the key re-moved whilst the headlamps are on, and the head-lamp switch is subsequently turned off with a dwell ofless than 1 second in the side lamp position, then a25 second headlamp delay will be initiated.

If the ignition switch is turned off and the key re-moved while the headlamps are on and the head-lamp switch is subsequently turned to the side lampposition for greater than 1 second then the head-lamps will be switched off and parking lamps will re-main on until the headlamp switch is turned off, orturned back to the headlamp position.

The headlamp delay may be cancelled immediatelyat any time while it's active (master lighting switch inthe off position) by the following actions:

Insertion of the ignition key or selection of auxi-liary /ignition (all exterior lamps will be extinguis-hed).

Turning the headlamp switch to the side lampposition. In this case the exterior lamps will im-mediately revert to parking lamps mode.

Turning the headlamp switch to the headlampsposition. In this case the headlamps and normalside lamps (i.e. not parking lamps) will be active.

Main Beam/Side lamp Warning lamps

The main beam warning lamp will be activated when-ever the main beam lamps are on, regardless of thestate of the ignition switch. The side lamp warninglamp will be active whenever the side lamp switch ison and the side lamps are operating in side lampmode, but not when the key is removed and theparking lamp mode is on.

HEADLAMPS mJMain Beam Headlamps

The main beam change over switch has a momen-tary action, which will cause the headlamps to switchbetween dipped and main beam on each operation.

Operation of the main beam changeover switch,while the dipped beam headlamps are activated andthe front fog lamps are inactive, will cause thedipped beam lamps to be extinguished and bothmain beam 1 and main beam 2 lamps to be illumi-nated.

Operation of the main beam changeover switch,while both dipped beam and front fog lamps are ac-tive, will cause the dipped beam lamps to be extin-guished and the main beam 1 lamps to be illumi-nated.

Daytime Running lamps

This feature is a requirement for vehicles for the Ca-nadian, Norwegian, Swedish and Finnish markets.

On these vehicles, with the engine running, daytimerunning loads will be active regardless of the state ofany switches.

This feature will in no way effect the operation of anyof the other lighting systems.

CIRCUIT OPERATION

mJ HEADLAMPS1"----30---1 Z2381 IP\ ~1 1Body Electrical1 \::y 10 A 1Control Module1_____ __J (BECM)

71 C258I See Fuse Details

s2051

14~ j ~242Z142InstrumentCluster[15] Control Unit

and Mess-age CentreDisplay

=o =OO=--- 1. .1 , [15]

I-- ----- ------------ ~

31 ~219S208i See Ground Dis-

I tribution! E252

r----IIL_

,...-------

- -- -- -- -- --- -- -- -- -- --~7~-lB-I-11-1-11-1-11-1-1JC2421/ BG BG RG RG OG OG LG LG.. E254 14 _ 5 _ 2 ....! 0 _ 1 _ 9 ....! 1 _ 3 C2561------------------------------1 Z238

I IP\ I Body ElectricalI \::y I Control ModuleL .J (BECM)

9 ER Iu-J RW 4 -;nte,;or lamps-----12rwJ::571 4 2 C219 1 2 C236- - -

X145 r--l,-l--' X273Main Lighting I [2] I Direction Indicator

[1] _ [2] "" Switch I - I [1] Headlamp\C:;I [1] Side Lamps I 0 I Flash

o [2] Headlamps I [1] I [2] Main BeamI 0 -L II_~ ---

8T ;236

S215 .I See Ground Dls-I tributionI.. E252

CIRCUIT DIAGRAM

HEADLAMPS mJ

CIRCUIT OPERATION

Side lamps:

Activation of the side lamp switch, when the ignitionkey is in, when the ignition is on, or when the headlamp switch is on, will result in the operation of thefollowing; front LH and RH side lamps, rear LH andRH side lamps, number plate lamps, lamps on warn-ing lamp and the rear door switch pack illumination.

The following lamps will also operate through theactivation of the side lamp switch:

Clock, fascia switch pack, console switch pack, gearselect assembly, instrument pack, front cigar lighter,Hevac panel switches and I.C.E. (remote telephonedial, when fitted).

Parking lamps:

With the ignition and auxiliary off, the key out and theheadlamp switch in the side lamp position, the park-ing lamps will be activated according to the positionof the direction indicator switch as follows:

If the indicator switch is in the central position,then all the side lamps will be on.

If the indicator switch is in the RH position, thenthe front right and rear right side lamps will beon.

If the indicator switch is in the LH position, thenthe front left and rear left side lamps will be on.

If the headlamp switch is set to the headlamp posi-tion, then normal side lamps will operate in conjunc-tion with the headlamps.

Side lamp Warning lamps:

The side lamp warning lamp will be active wheneverthe side lamp switch is on and the side lamps areoperating in side lamp mode, but not when the key isremoved and the parking lamp mode is on.

SIDE LAMPS lID

CIRCUIT OPERATION

lID SIDE LAMPS1----30---1 Z2381 IP'\ ~1 1Body Electrical1 ~ 10 A 1Control Module1 1(BECM)----- ---

71 C258

I See Fuse DetailsS205.

Z142InstrumentCluster[15] Control Unit

and MessageCentre Dis-play

=oo=_____1 ,~~ I

----- ----- ----- ~

r----11L_

__..J7D- 18 2 12 3 13 5 15 C242BG BG RG RG OG OG LG LG.. E254

F-------

14 52....!0 1 9....!1 3 C256r-------------------------, Z2381 IP'\ I Body ElectricalI ~ I Control ModuleL J (BECM)

9IC257OR

1 C2191/1--1 X1451 [1] I Main LightingI -1 .... 1 Switch1~_LJ [1] Side Lamps

31 ~219

S208 I See Ground Dis-I tribution1E252 :>

CIRCUIT DIAGRAM

SIDE LAMPS lID

lID SIDE LAMPS

14[-1}-1] C361

GR RB GP

4 3 2 C366-- --,.....~--""""'I'I:---.....,~-..,B175

Left Rear LampAssembly[1] Direction[2] Tail[3] Stop

'-----~:...._--_.....

4 12 C325GP }

RW


Trailer AuxiliarySocket

2

'F66i 5356I GroundII.. E367

GW RW GP

3 4 C316.....~--....,~--~--.., B176

Right Rear LampAssembly[1] Direction[2] Tail[3] Stop

..........................ol"""""".........................

'F"i 5301I GroundII.. E322

CIRCUIT DIAGRAM

CIRCUIT OPERATION

Brake lamps

The brake lamps (including the high mounted stoplamp when fitted), are operated when the brakeswitch is closed, provided the ignition is switched on.

STOP LAMPS a

CIRCUIT OPERATION

IIEI STOP LAMPS

PP

...-----------------------------1 Z238I 15 30 1Body Electrical1 m~(17 m~(1 1Control Module:_~~ ~~J (BECM)

9F----~ee ~us:Detai:------------711 ~~~8Fuse Details5211 .--~

11 C227 IX168 .5205Stop LampSwitch

[1] [1] BrakePedal De-

'--3....l11'.fG-~-----21~C-227.......yp. } pressed

Anti-Lock Brake5201 System.-----~

______4

-------, [15]II_____ .J

r---------------I L_

L ~

17r:-P.;-I11-I-1I-:r-11-I-1]C2421 - BG BG RG RG OG OG LG LG.. E254

4 C258 14 _ 5 _ 2 ....!0 _ 1 _ 9 .....:! 1 _ 3 C2561'----------------------------------1 Z2381 I?'\ 1Body Electrical1 \::y IControl Module1----------------------------------- (BECM)

CIRCUIT DIAGRAM

STOP LAMPS a

CIRCUIT OPERATION

Hazard lamps

When the hazard warning switch is operated, all indi-cator bulbs, side repeaters and the hazard switchillumination bulb will operate at the specified rate,regardless of the ignition switch position. The indica-tor warning lamps within the instrument pack willalso operate under this condition.

If the inertia switch is operated and the ignition is on,all indicator bulbs, side repeaters, warning lampsand the hazard switch bulb will flash at the specifiedrate.

In addition to the operation of the indicator bulbsthere will be an audible tick generated by the SeCM,timed to match the bulb illumination in the instrumentpack.

DIRECTION INDICATOR LAMPS a

CIRCUIT OPERATION

I:ICI DIRECTION INDICATOR LAMPS1----30---1Z2381 ~1 1Body Electrical1 10 A 1Control Module

1(BECM)1 - _71 C258I See Fuse Details

S205 I

InstrumentCluster[15] Control Unit

and Mess-age CentreDisplay[15]

_ __ _ __ _ __.J

-1-r-r-1-1-1-1-J8 18 2 12 3 13 5 15 C242

SP BG BG RG RG OG OG LG LG

14 5 2 10 1 9 11 3 C256- - - - - - -

_____________l L ,I II II _ __~

rn------- ------- ---------------mZ142

L.. _ _

17 r;;: 1 ~~.. E254

H6-3

H6-3 BI--'"

r--------------------, Z238I I Body ElectricalI I Control ModuleL .J (BECM)

7~ 11C25r:5 Interior Lamps

GLG PG RW

5 2 6 C212- -....~-~~-,:--....,X220

Hazard Switch

3~~212

S208 : See Ground Dis-I tributionI.. E252

CIRCUIT DIAGRAM

I:ICI DIRECTION INDICATOR LAMPS

Z238Body ElectricalControl Module(8ECM)..................

12 C120

GR

4 C113

GW

NAS Except NAS NAS Except NAS

GR GR GW GW

1 C158A

~81 53

((A Left Front lndi-\C:I cator Lamp

2 C158A

1 C187A

~81 54

((A Right Front lndi-\C:I cator Lamp

2 C187A

Except NASIS111


2 C18788128Right FrontLamp Assembly[1] Direction 8

IndicatorLamp

NASI Except NASS101


2 C1588

8115Left Front LampAssembly[1] Direction 8

IndicatorLamp

NAS

CIRCUIT DIAGRAM

CIRCUIT OPERATION

Reversing lamps:

With the ignition on and the gear selector levermoved to the reverse position both reverse lampswill activate.

REVERSING LAMPS a

CIRCUIT OPERATION

IIiI REVERSING LAMPS--.- -- - _.- -- _._, -_.-_._, -_.- -- _. - ---~ Z238

Body ElectricalControl Module(BECM)

8------------9

18 C626

UP UG

Automatic Trans-mission


GN

5608._- 'I UB 5609--- --....5610----- --- --....

Automatic Gear-box

1 C564

gJX157Reverse Sw;!cho - 12 C564

3 C660C560

10 C659C559

6 7 C660C560

x y ZP 0 1 1

R 0 0 1

N 1 0 1

D 1 0 0

3 0 0 0

2 0 1 0

1 1 1 0

Z* 1 1 1

1 =Switch Open

o=Switch Closed

B* = Fault

1 2 3 C562

6 C562BG

5 C560C660B

: 5607

III.. E621

X294Gear Box PositionSwitch

[1] X Switch-. 'IllO , [2] Y Switch

[3] Z Switch

i 5551IIIIIIIII E529 Petrol.. E574 Diesel

CIRCUIT DIAGRAM

REVERSING LAMPSmJ _Z238Body ElectricalControl Module(BECM)

2 9 C325

LGN GN

6 5 C306---------------C806

W W

4 C813 2 C816B177 B178Left Tailgate Lights Right Tailgate

[1] Reverse Lights

[1] Reverse

1 C813

W W

2 1 C806--------------- C306

B B

5301 }...------------~.---lIlIIB

.. E322

D CIRCUIT DIAGRAM

CIRCUIT OPERATION

Front Fog lamps

With the ignition switch and side lamp or headlampswitch on, a momentary operation of the front foglamp switch will activate the front fog lamps. A fur-ther momentary operation of the fog lamp switch, orswitching off of the headlamps/side lamps or ignition,will cause the front fog lamps to be extinguished.N.B. The front fog lamps will always be inactivewhen the ignition is turned on.

Rear Fog lamps

With the ignition on, the headlamp switch on or frontfog lamps on, a momentary operation of the rear foglamp switch will activate the rear fog lamps. Opera-tion of the rear fog lamps will also activate a bulbwithin the fog lamp switch. A further momentary op-eration of the fog lamp switch, switching off the headlamps and front fog lamps, or switching off the igni-tion, will cause the rear fog lamps to switch off. N.B.The rear fog lamps will always be inactive when theignition is turned on.

FOG GUARD LAMPS a

CIRCUIT OPERATION

a FOG GUARD LAMPSZ238Body ElectricalControl Module(BECM)

3 C120 10 C113 10 14 C257

YR RY

Interior Lamps

C220RY

r--"""'l'I!:~--~-~~----' X270

Front Fog Lamps5witch

RY

1 C159

[{]

B18410'\ lett Front Fog"C:>I lamp

2 C159

B

.. E252

520"j--] tributiof'l5207----4

1 C188

[{]

B18310'\ R;ght Front Fog"C:>I lamp

2F""i 5111IIIIIIIII.. E181

B

i 5101IIIIIIIII.. E154

CIRCUIT DIAGRAM

FOG GUARD LAMPS a

a FOG GUARD LAMPS1---30--1 Z2381 ~1 1Body Electrical1 1Control Module1 10 A I(BECM)L I

7' C258I See Fuse DetailsI

s2051

14r J;242r------ --- ------------------ Z142

Instrument Cluster

[15] Control Unitand MessageCentre Displayr- -- ----"'---------T'51

- ----- ----- ~

7 8 18 2 12 3 13

___J

5 15 C242

B B BG BG RG RG OG OG LG LG

14 5 2 10 1 9 11 3 C256- --r-----------------------I Z2381 I?\ 1Body ElectricalI \::y 1Control Module________________________...J (BECM)

D CIRCUIT DIAGRAM

CIRCUIT OPERATION

Courtesy lamps

Automatic courtesy lamp facility enabled

With the tailgate or any of the four doors opened theillumination level of the following lamps will fade onover a period of approximately 0.5 seconds:

front courtesy lamp

rear left courtesy lamp

rear right courtesy lamp

load space lamps

front left footwell lamp

front right footwell lamp

ignition ring illumination

rear right footwell lamp

rear left footwell lamp

If any door is left open, the lamps will fade out after atime of approximately 10 minutes. During the 10minute time out, if any other door is opened the timerwill be reset.

If all doors are closed prior to the end of this 10minute period then all specified lamps will fade outafter a delay of 15 seconds.

If the ignition is switched on before the end of the 15second time out period, the specified lamps willbegin to fade out after a delay of 1 second.

If the ignition is then switched off and no dooropened, the 15 second time out of the lamps will notbe resumed.

If an unlock signal is received from the remote key,or if a key unlock is received from either of the frontdoors while all the doors are closed, then thecourtesy lamps will fade to on in 0.5 seconds andbegin a 15 second time out period.

If any of the doors or the tailgate are opened duringthis delay, then the time out period will be restarted.

If all the doors are closed and a lock signal isreceived from the remote key or either of the frontdoor COL switches while the courtesy lamps are intheir 15 second time out period, then the time delaywill be cancelled and the lamps immediately fadedout.

Automatic courtesy lamp facility disabled

Whenever the main courtesy lamp switch is operatedfor greater than 2 seconds, the automatic courtesylamp feature will switch between the enabled anddisabled mode upon release of the switch. At the

INTERIOR LAMPS msame time an "Int lamps off"!"lnt lamps auto"message will be displayed on the instrument pack.This extended switch operation will also extinguishthe courtesy lamps if the button has been depressedfor 2 seconds, causing the system to switch from theautomatic to disabled mode, but otherwise will haveno effect on their state.While the automatic courtesylamp facility is disabled, the courtesy lamps may onlybe switched on and off by momentary activation ofthe main courtesy lamp switch. The change of lampstate will occur on release of the switch.

Panel Dimmer:

Operation of the panel dimmer switch, with the sidelamps on, will alter the level of panel illumination be-tween approximately 6 and 94%. Depressing theswitch momentarily will cause the illumination to in-crease or decrease to the next level. Holding theswitch closed will cause the illumination to ramp to-wards fully on or fully off.

The illumination level selected will be stored in theSeCM's non-volatile memory whenever the driver'sseat store sequence is completed successfully, pro-vided the side lamp switch is on. If the side lampswitch is not on and a successful memory store se-quence is completed, then the previously stored illu-mination level will remain unchanged.

CIRCUIT OPERATION

mINTERIOR LAMPSPuddle lamps

With any door open and the automatic courtesy lampfeature enabled, the puddle lamp within the relevantdoor will be illuminated, either until the door is closedor a time period of approximately 10 minutes haselapsed. If any puddle lamp is on, momentaryoperation of the courtesy lamp master switch willextinguish all puddle lamps on release of the switch.

Further operation of the switch or reopening a door(if automatic courtesy lamps are enabled) will againactivate the puddle lamps for those doors that areopen. If the courtesy lamp switch is held on forlonger than 2 seconds, the automatic operation ofthe puddle lamps from the door open switches willswitch between enabled and disabled.

CIRCUIT OPERATION

INTERIOR LAMPS m

2

C309C8S7

C8S7

C309

2

1

1 C864

[I]B174

IC'\ Rear load Space'

mINTERIOR LAMPS

~.- -- _. -,-_.--- _. - _.- -- _. -,-_.--- _. -,-_.--- - _.- -- _. -,-_.., Z238


1

LG

10

R

9 C362

OG

19

LG

9

R

10 C326

OG

3 4 5 C351

C751L

13 14 15 C755L

Z243Left Front DoorOutstation

71 C758L

PW

4 C762LM153Left Front DoorLock Actuator

[3] Door AjarSwitch

21 C763L

11 :758L

3 4 5 C301

C751R

13 14 15 C755R

Z244Right Front DoorOutstation

71 C758R

PW

6 C762RM154Right Front DoorLock Actuator

[3] Door AjarSwitch

21 C763R

11 :758RZ243Left Front DoorOutstation

Z244Right Front DoorOutstation

7 r---91 C755LL.__! 5353

IIIII.. E367

CIRCUIT DIAGRAM

7 r---91 C755RL.__! 5307

IIIII.. E328

mINTERIOR LAMPS

~'- -- _. -_.- -- - _.- -- _. -,-_.--- _. -, -_.- -- - _.- -- _. -,-_.---Z238


4 12 C256 9 C257 5 C258

6

RLG RB

5 C236

OR

1 C219X145Main LightingSwitch

[1] Side Lamps

3 C219

B

R

1 C205X245Glove Box Switch

2 C205

B

S208

X273Direction Indicator

[5] Dim Increase[6] Dim Decrease

"I ~236 S215

II See Ground Dis-I tributionIII-f-E252

CIRCUIT DIAGRAM

-f-E252

INTERIOR LAMPS m

mINTERIOR LAMPS

Cruise Control5209Partial

- IZ2381 I?\ 1Body Electrical1~ 1Control Module1 (BECM)

21 C258RW-----. 15210

6 C242I ""1--- -,Z1421,( J.. 1 I Instrument1Q9 Q9 Q9 IClusterLY 1 b I

7fc1 7JC242v--- B.. E254

21 C219I l' IX145I /()\ I Main LightingI '

mINTERIOR LAMPS-----IZ238

l l~~~~r:"':.:':~~~~1__ __(8ECM)

11IC625RU

5612...------e---------...AutomaticTransmission


IRU9 C617 RU 1 C618

5611_e --lIIIIII

8106Fascia CigarLighter

8

C6191

Z254'H' Gate SensorModule

Transfer Gearbox4

C6158C605

5 C614

X297Transfer SwitchManual

6 C614

Z259Centre ConsoleSwitch PackOutstation

1

8

C605C6158

8

5607...--------------e---..III~ E621

CIRCUIT DIAGRAM

INTERIOR LAMPS mZ238Body ElectricalControl Module(BECM)

2 C232

5ee Fuse De-tails

Ip

7I~258RHD

5205I

LHD

lp...---~. 5216

mINTERIOR LAMPS

3 C361

RP

4 C355C705L

8114Left Front DoorPuddle Lamp

21 C755RZ243Left Front Door PROutstation

1 C757R

[]8 127

Right FrontDoor PuddleLamp

21 C757R

11 ~755R-----IZ244

I IP\ IRight FrontI \::Y IDoor Outsta-I tion

PR

C755L

C757L

2

1

21 C757L

11 :755L-----IZ243

I IP\ ILeft Front DoorI \::Y IOutstationI ......

15 C755L1413

8150Right Rear DoorPuddle Lamp

C708R

C708R

8

i S701RI ljrounaII.. E328

2

1

8149Left Rear DoorPuddle Lamp

8

C708L

i S701LI GroundII.. E367

2 C708L

1

CIRCUIT DIAGRAM

CIGAR LIGHTER/CLOCK m--------------------------------'Z238

30 30 Body ElectricalF 8 F 1 Control Module30 A 10 A (BECM)

RL7

- --I117\1I~I1 -L___ _ _

5 C625

Interior Lamps

71 C258I See Fuse DetailsIII S205

Interior Lamps

G RU p RW

2 C619 1 C618

A

f);lrny

1 C619

B

i S611I See Ground Dis-tributionIIII.. E621

B106Fascia CigarLighter

1 C216 1 C217

T

0I fJ

2 C216

B

S208

II See Ground Dis-

tribution

IIII.. E252

Z117Clock

DCIRCUIT DIAGRAM

HEATING AND VENTILATION (WITHOUT AlC) mCIRCUIT OPERATION

Ignition position 1 (Accessories)

This feed is obtained from the BeCM via fuse 8 andis shared with the Radio, Front cigar lighter, Aerialamplifier and car phone (if fitted). The Ignition 1 isessential to the control panel as it provides power tothe ECU although no functions or display on the LCDare possible.

Ignition position 2

This feed is obtained from the BeCM via fuse 17.

Battery feed

This feed is obtained from the fuse box via fuse 42.

Ground Connection

This feed runs down to a spliced joint, joining themain earth run down to fascia earth point 1.

Dimmer Line

This Pulse Width Modulated signal is provided by theBeCM.

LCD Dimmer line

This line is a input to the HEVAC and the signal is ainverse Pulse Width Modulated signal which isdetermined by the instrument pack.

Alternator Charge signal

This signal is given to the HEVAC ECU to inform itthat the engine is running. This signal is active low.

Diagnostic Kline

This line is used to communicate with the diagnosticequipment (TESTBOOK) and is normally held at 12Vwhen not active

Left/Right Recirculation motors

These motors control the flaps on the blower motormodules. The flaps should be in one of twopositions, either fully open or fully closed.

Left/Right Blower modules

The blowers have a permanent 12V feed to them.The speed of the motors is determined by the controllines which go to the motors. The motors alsoprovide a voltage feedback to the HEVAC ECU todetermine the actual voltage at the motors but alsoto show if there are any faults.

Left/Right Blend and Distribution Motors

These motors are controlled by the HEVAC ECUwhich provides power to the motors, which in turnreport back their actual positions to the HEVACECU.

CIRCUIT OPERATION

I:iI HEATING AND VENTILATION (WITHOUT Ale)

DieselPetrol

1---""iZ1061 1Generator

1 D + 1-1;'

IC5063 C106 l t 5tarting and5573----.... ChargingIC57125 C121

151 C114---------------------------------- Z238

15 30 .Body Electncal

F 17 F 8 Control Module10 A 30 A (BECM)

RL7

Interior Lamps

- -II~II~I1__ -________ _ U

~~: 9 r~-------6TwK---------21c::5211.--' 5212 ..., 5210i-~}

I 71 C226 5209.-~ 1----Z111

5ee Fuse Details 1~ 1RadioI~I____I

17

KR

8

3 1 6 C244-------- -----------

r----------------------------'n~I ~ IHeating Venti la-I ~ I tion and Air1 JConditioning

2 r--1C246A 4rC244 Control UnitKR LGR B (HEVAC)....__ 5213J.::} ~:~~o~inkCon- __ }

5214L 5208 i---" 5ee Ground Dis-__ tribution

7 _.15 C231 5207 1---"X318Data Link Connector(OBDII) .. E252

CIRCUIT DIAGRAM

HEATING AND VENTILATION (WITHOUT AlC) m


[6] AuxiliaryPower 1RelayAuxiliaryPower 2Relay

rn-------------------------------- P125a30 30 Engine Compart-

m~53~ m~54~ ment Fuse Box

1~ 1~[If----f]~~7 [If----f]:~6 [71

___~l~~~~ JL~~~~Jl ~

K3-5

1

K3-5

3[---------------4WLG

8 C112

1--~---IZ2381 I?'\ 1Body ElectricalI ~ 1Control Module1 I(BECM)_______I

13 C256A

C174 1

WP

2

B

C172

WLG

C101C201

WK

3 C238

1---1 I1 011

---IX134

~ Ilgnition Switch---+ III 1

1____I

4 C238

B

.5215

II See Ground Dis-

tribution

II.. E252

CIRCUIT DIAGRAM

HEATING AND VENTILATION (WITHOUT AlC) m


D

Z253Heating Ventila-tion and AirConditioningControl Unit(HEVAC)

5ributionor

12 11 8 13 14 10 '-9 '-"7 '-5 '-1 6 16 15 r r r-"4 C261

B N W RB S

M16

5 ~)DistMot

'---

B N W RB S

M164

5Right Blend

o-r-t Motor

-

B N W RB S

M163

5 T1Left Blend Motor

-

CIRCUIT DIAGRAM

CIRCUIT OPERATION

HEATING AND VENTILATION (WITH Ale) mAmbient Sensor

This sensor measures the temperature of theexternal air flow into the vehicle.

Ignition position 1 (Accessories)

This feed is obtained from the BeCM via fuse 8 andis shared with the Radio, Front cigar lighter, Aerialamplifier and car phone (if fitted). The Ignition 1 isessential to the control panel as it provides power tothe ECU although no functions or display on the LCDare possible.

Ignition position 2

This feed is obtained from the BeCM via fuse 17.

Battery feed

This feed is obtained from the fuse box via fuse 42.

Ground Connection

This feed runs down to a spliced joint, joining themain earth run down to fascia earth point 1.

Dimmer Line

This Pulse Width Modulated signal is provided by theBeCM.

LCD Dimmer line

This line is a input to the HEVAC and the signal is ainverse Pulse Width Modulated signal which isdetermined by the instrument pack.

Compressor Clutch

The clutch line provides a 12 volt power feed to thecompressor clutch via pressure switch 1.

Condenser Fans

The HEVAC panel provides a signal normally at 12volts for "off" condition and 0 volts for the "on"condition, which in the case of petrol vehicles is fedinto the ECM and diesel vehicles directly onto thecoil of relay 18. In line is the Air-Conditioningpressure switch 2, which turns the fans on/off.

When relay 18 is energised, it provides connectionbetween relays 13 and 14 (fan 1 and 2) in series orparallel with each other. This is dependent upon thestate of the air-conditioning pressure switch 1.

For the petrol option, when the signal enters theECM, the ECM will switch the output on/off to thefuse box. The ECM will switch the output onsometimes for engine cooling reasons even thoughthe engine has been turned off.

Aspirator

There are two parts of this sensor, one of which is afan which draws cabin air onto the temperaturesensor. The temperature sensor then sends thesignal back to the HEVAC ECU.

REV: 02/98

For vehicles with VIN's up to 381430:

The ambient temperature sensor is located behind thedrivers side of the fascia.

For vehicles with VIN's from 381431:

The ambient temperature sensor is located behind theLH side of the vehicle in front of the condenser. Therevised location improves the response time of thesensor. The new HEVAC software will not update theambient temperature sensor readings unless thevehicle is travelling over approximately 15 mph (25km/h). The HEVAC software will therefore not auto-matically correct temperature readings when a faultyambient temperature sensor is renewed.

Temperature Resistance (Ohms)

-20 0 C (_4 F) 94.5 K

-10 0 C (14 0 F) 54.3 K

00 C (32 0 F) 32.1 K

100 C (50 0 F) 19.7 K

20 0 C (68 0 F) 12.5 K

30 0 C (86 0 F) 8.1 K

40 C (104 F) 5.4 K

Heater Core Sensor

This sensor measures the engine coolanttemperature within the fascia area.

Evaporator Sensor

This sensor is located within the evaporator unit and,by providing feedback to the HEVAC ECU, preventsit from freezing.

Alternator Charge signal

This signal is given to the HEVAC ECU to inform itthat the engine is running. This signal is active low.

Diagnostic Kline

This line is used to communicate with the diagnosticequipment (TESTBOOK) and is normally held at 12Vwhen not active.

Road Speed

This signal is fed into the HEVAC ECU.

Solar Sensor

This sensor provides the HEVAC ECU with thepower of the sun's solar load and allows the systemto compensate accordingly.

CIRCUIT OPERATION

121 HEATING AND VENTILATION (WITH Ale)AlC Request

This signal is active low and sends a request to theECM to switch on the air-conditioning system.

AlC Grant

This signal is active low and sends a signal to theHEVAC ECU to acknowledge the request signal andthat it is ready for the load to be switched on by theHEVAC system.

Pressure switch 1 (Trinary switch)

This switch is in parallel with two components, thecondensor fans and the compressor clutch which areboth normally short circuit. If the pressure is too highor too low, the switch will open and cut the feed tothe clutch to prevent damage to the system. With thethird setting, at a specific pressure the switch isshorted and changes the condenser fan mode fromseries to parallel.

Pressure switch 2 (Single switch)

The switch is normally open circuit. At a specificpressure, the switch is shorted and allows thecondenser fans to turn on.

Left/Right Recirculation motors

These motors control the flaps on the blower motormodules. The flaps should be in one of twopositions, either fully open or fully closed.

Left/Right Blower modules

The blowers have a permanent 12V feed to them.The speed of the motors is determined by the controllines which go to the motors. The motors alsoprovide a voltage feedback to the HEVAC ECU todetermine the actual voltage at the motors but alsoto show if there are any faults.

Left/Right Blend and Distribution Motors

These motors are controlled by the HEVAC ECUwhich provides power to the motors, which in turnreport back their actual positions to the HEVACECU.

CIRCUIT OPERATION

HEATING AND VENTILATION (WITH Ale) m

Diesel

1-3O'--,P125a

1 j F 42 1Engine Compart-I 10A Iment Fuse Box1 1- __I

8 C172 Petrol

1---""jZ106

1 1Generator

1 0 + 1-1;'

4

PN

C102C202 IC5063 C106

JS573 ~.~ Starting and

ICharging

C57125 C121

151 C114-------------------------------- Z238

15 30 .Body Electncal

F 17 F 8 Control Module10 A 30 A (BECM)

RL7

- -IlIP',!I~I1__ -

X318Data Link Connector (OBDII)

8 17 C255 9r----------61 C258KR LGR W WK

S211 .----, S212 ...,

I 71 C226 1----Z111

_ See Fuse Details 1 :Radio-, PN L I2 L_3 --:' C244

r--------------------------ln~I IP\ IHeating Venti la-I ~ [tlon and AirL JConditioning

6 r--1C246B 41 C244 Control UnitKR LGR (HEVAC)S21

J.-"'}Data Link Con- B

...__ -.... nectorS214L S208 i

7 _.15 C231 S~e ~round Dis- Itnbutlon I

I.. E252

CIRCUIT DIAGRAM

121 HEATING AND VENTILATION (WITH Ale)

o

Heated FrontScreen

NYBR WB YBP

----I Z108I I Anti-Lock Brake Sys-I I tern ECU1 ...1281 C116R LHD

C116L RHOYG

11 C114---------------------.,Z238: IBody ElectricalL __":: --__-:.. J ~Bo;~r~; Module

15 6 11 10 9 C255 21 C258RW

S210i-----'

S209.--, l PG

I C102Interior Lamps 10 C20220 ~ !.? 5 JJ C246B 6 C244 5 C244--Jf"-""--r-J-I -----1--------------[,Z253-l__L_ - -- ----- ------------- 1 Heating Ventila-I I tion and AirI I ConditioningI \\ t..t.t. ,m n @ OJ]') ~ a.L. AlC I Control UnitI ~ @:iJ PROG \:ffi/ ~ AUTO 'J ~ OFF I (HEVAC)L I~7~-r,-I~7~-T,-7~ -- I;

o 0 0 0 0 0 0

-------------------------------,I II II . . . if II LCD f?J ~iJ ~rI~;J ftJ l:J. 'V l:J. 'V I

l J-~li-~~~2i-;fi-~~~rIJ~~rfJ:L__ _ _

11I~46B20 C242

r--r-----'Z142I IInstrumentI IClusterI r - LCD - -I [15] I[15] Control UnitII 1 I and MessageII 1 1 Centre Dis-1L=====.!..__ .J play

CIRCUIT DIAGRAM


18161514

Z253Heating Ventila-tion and AirConditioningControl Unit

................................................................................................................................... (HEVAC)

9 C246B

BG N BN BW NU

234 1 C218,....,_--~~-"""'ll:--~.., K219

AlC AspiratorC202C102

1

Diesel Petrol

4C121

7C106

C571 C506

9 C572 1 C505

Z132 Z132Engine Control Engine ControlModule (ECM) Module (ECM)

24

5

C572

BS

C571C121

28

6

C507

BS

C506C106

Diesel Petrol

J~i~tZ253Heating Ventila-tion and AirConditioningControl Unit

.............................. (HEVAC)

CIRCUIT DIAGRAM

range rover - 1997 - 6th edition

Documents

system ecu1

system messages

system ecui

antilock brakei

outlet valves

theabs hydraulic pump

pump relay nowenergizes

abs functions