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INSTRUMENT PANEL AND GAUGES

CONTENTS

page page

DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6GENERAL INFORMATION . . . . . . . . . . . . . . . . . . 1

SERVICE PROCEDURES . . . . . . . . . . . . . . . . . . 22SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . 30

GENERAL INFORMATION

Following are general descriptions of major instru-ment panel components. Refer to Group 8W - WiringDiagrams for complete circuit descriptions and dia-grams.

INSTRUMENT PANELModular instrument panel construction allows all

gauges and controls to be serviced from the front ofthe panel. In addition, most instrument panel wiringor heater and air conditioning components can be ac-cessed without complete instrument panel removal.

Removal of the dash pad and center cluster bezelallows access to the cluster assembly, the climatecontrols, the graphic display module/vehicle informa-tion center, and the radio. Removal of the cluster as-sembly allows access to the individual gauges,illumination and indicator lamp bulbs, printed cir-cuit, and most wiring.

Removal of the lower instrument panel trim, kneeblocker, and glove box module allows access to theleft and right switch pods, heater and air condition-ing components, wiring, and steering column mounts.A cover inside the glove box conceals the relay center,and a cover on the right end of the instrument panelconceals the fuseblock module.

INSTRUMENT CLUSTERSOne basic instrument cluster is offered on all

Grand Cherokee models. The cluster is served by asingle printed circuit and wiring connector. The clus-ter also includes a message center area containing upto 13 indicator lamps. The message center is servedby the same printed circuit and wiring connector asthe cluster. Some variations of the cluster exist dueto optional equipment and regulatory requirements.

The instrument cluster includes the followinggauges:• coolant temperature gauge• fuel gauge• oil pressure gauge• speedometer/odometer• tachometer

• trip odometer• voltmeter.

The cluster includes provisions for the following in-dicator lamps:• airbag indicator lamp• anti-lock brake system lamp• brake warning lamp• hazard warning indicator (export)• headlamp high beam indicator lamp• low fuel warning lamp• malfunction indicator (Check Engine) lamp• master lighting indicator (export)• seat belt reminder lamp• security lamp• turn signal indicator lamps• upshift indicator lamp.

GAUGESWith the ignition switch in the ON or START posi-

tion, voltage is supplied to all gauges through the in-strument cluster printed circuit. With the ignitionswitch in the OFF position, voltage is not supplied tothe gauges. A gauge pointer may remain within thegauge scale after the ignition switch is OFF. How-ever, the gauges do not accurately indicate any vehi-cle condition unless the ignition switch is ON.

All gauges except the odometer are air core mag-netic units. Two fixed electromagnetic coils are lo-cated within the gauge. These coils are wrapped atright angles to each other around a movable perma-nent magnet. The movable magnet is suspendedwithin the coils on one end of a shaft. The gauge nee-dle is attached to the other end of the shaft.

One of the coils has a fixed current flowing throughit to maintain a constant magnetic field strength.Current flow through the second coil changes, whichcauses changes in its magnetic field strength. Thecurrent flowing through the second coil can bechanged by:• a variable resistor-type sending unit (fuel level,coolant temperature, or oil pressure)• changes in electrical system voltage (voltmeter)

ZJ INSTRUMENT PANEL AND GAUGES 8E - 1

• electronic control circuitry (speedometer/odometer,tachometer).

The gauge needle moves as the movable permanentmagnet aligns itself to the changing magnetic fieldscreated around it by the electromagnets.

COOLANT TEMPERATURE GAUGEThe coolant temperature gauge gives an indication

of engine coolant temperature. The coolant tempera-ture sending unit is a thermistor that changes elec-trical resistance with changes in engine coolanttemperature. High sending unit resistance causeslow coolant temperature readings. Low resistancecauses high coolant temperature readings. Sendingunit resistance values are shown in a chart in Spec-ifications.

FUEL GAUGEThe fuel gauge gives an indication of the level of

fuel in the fuel tank. The fuel gauge sending unit hasa float attached to a swing-arm in the fuel tank. Thefloat moves up or down within the fuel tank as fuellevel changes. As the float moves, an electrical con-tact on the swing-arm wipes across a resistor coil,which changes sending unit resistance. High sendingunit resistance causes low fuel level readings. Lowresistance causes high fuel level readings. Sendingunit resistance values are shown in a chart in Spec-ifications.

OIL PRESSURE GAUGEThe oil pressure gauge gives an indication of en-

gine oil pressure. The oil pressure sending unit con-tains a flexible diaphragm. The diaphragm moves inresponse to changes in engine oil pressure. As the di-aphragm moves, resistance increases or decreases.High resistance in sending unit causes high oil pres-sure readings. Low resistance causes low oil pressurereadings. Sending unit resistance values are shownin a chart in Specifications.

SPEEDOMETER/ODOMETERThe speedometer/odometer gives an indication of

vehicle speed and travel distance. The speedometerreceives a vehicle speed pulse signal from the VehicleSpeed Sensor (VSS). An electronic integrated circuitcontained within the speedometer reads and analyzesthe pulse signal. It then adjusts the ground path re-sistance of one electromagnet in the gauge to controlneedle movement. It also sends signals to an electricstepper motor to control movement of the odometernumber rolls. Frequency values for the pulse signalare shown in a chart in Specifications.

The VSS is mounted to an adapter near the trans-mission or transfer case output shaft. The sensor isdriven through the adapter by a speedometer piniongear. The adapter and pinion vary with transmission,

transfer case, axle ratio and tire size. Refer to Group21 - Transmission and Transfer Case for more infor-mation.

TACHOMETERThe tachometer gives an indication of engine speed

in Revolutions-Per-Minute (RPM). With the enginerunning, the tachometer receives an engine speedpulse signal from the Powertrain Control Module(PCM). An electronic integrated circuit containedwithin the tachometer reads and analyzes the pulsesignal. It then adjusts the ground path resistance ofone electromagnet in the gauge to control needlemovement. Frequency values for the pulse signal areshown in a chart in Specifications.

TRIP ODOMETERThe trip odometer is driven by the same electronic

integrated circuit as the speedometer/odometer. How-ever, by depressing the trip odometer reset knob onthe face of the speedometer, the trip odometer can bereset to zero. The trip odometer is serviced only as apart of the speedometer/odometer gauge assembly.

VOLTMETERThe voltmeter is connected in parallel with the bat-

tery. With the ignition switch ON, the voltmeter in-dicates battery or generator output voltage,whichever is greater.

INDICATOR LAMPSIndicator lamps are located in several areas of the

cluster. All lamps within the cluster are served bythe cluster printed circuit and cluster connector.

AIRBAG INDICATOR LAMPThe airbag indicator lamp is switched to ground by

the Airbag Control Module (ACM). The lamp lightsfor 6 to 8 seconds each time the ignition switch isturned to the ON position as a bulb test and to indi-cate a system self-test is in process. If the lamp re-mains on after the self-test or comes on whiledriving, it may indicate that the ACM has detected asystem malfunction or that the system has becomeinoperative. Refer to Group 8M - Restraint Systemsfor more information.

ANTI-LOCK BRAKE SYSTEM LAMPThe Anti-Lock Brake System (ABS) lamp is

switched to ground by the ABS module. The modulelights the lamp when the ignition switch is turned tothe START position as a bulb test. The lamp willstay on for 3 to 5 seconds after vehicle start-up to in-dicate a system self-test is in process. If the lamp re-mains on after start-up, or comes on and stays onwhile driving, it may indicate that the ABS module

8E - 2 INSTRUMENT PANEL AND GAUGES ZJ

has detected a system malfunction or that the systemhas become inoperative. Refer to Group 5 - Brakesfor more information.

BRAKE WARNING LAMPThe brake warning lamp warns the driver that the

parking brake is applied or that the pressures in thetwo halves of the split brake hydraulic system areunequal. With the ignition switch turned ON, batteryvoltage is supplied to one side of the indicator bulb. Aground path for the bulb is provided by 3 switches.The bulb will light when:• the brake warning switch is closed (indicating un-equal brake system hydraulic pressures possibly dueto brake fluid leakage)• the ignition switch is in the START position (bulbtest)• the parking brake switch is closed (parking brakeis applied).

Refer to Group 5 - Brakes for more information.

HAZARD WARNING INDICATORThis lamp is required for certain export applica-

tions. The lamp is energized when the hazard warn-ing flasher system is operating.

HEADLAMP HIGH BEAM INDICATOR LAMPThe high beam indicator lamp is controlled by the

headlamp dimmer (multi-function) switch. One sideof the indicator bulb is grounded at all times. Theother side of the bulb receives battery feed throughthe contacts of the dimmer switch when the multi-function switch stalk is actuated to turn the head-lamp high beams on. Refer to Group 8L - Lamps formore information.

LOW FUEL WARNING LAMPThe low fuel warning lamp will light when the fuel

level falls below approximately 4 gallons. One side ofthe low fuel warning bulb is grounded at all times. Alow fuel warning module attached to the rear of thetachometer provides battery voltage to the lampwhen the fuel level is low. The low fuel warning mod-ule receives a signal from the fuel level sending unitthat is the same signal used for the fuel gauge.

MALFUNCTION INDICATOR LAMPThe CHECK ENGINE or Malfunction Indicator

Lamp (MIL) lights each time the ignition switch isturned ON, and stays on for 3 seconds as a bulb test.If the Powertrain Control Module (PCM) receives anincorrect signal or no signal from certain fuel oremission system related circuits or components, thelamp is turned on. This will indicate that the PCMhas recorded a Diagnostic Trouble Code (DTC) inelectronic memory for a circuit or component mal-function. Refer to Group 14 - Fuel System for moreinformation.

MASTER LIGHTING INDICATORThis lamp is required for certain export applica-

tions. The lamp is energized when the park lamps orhead lamps are operating.

SEAT BELT REMINDER LAMPThe seat belt reminder lamp lights for 4 to 8 sec-

onds after the ignition switch is turned to the ON po-sition. A timer in the chime/buzzer module controlsignition-switched battery feed to the lamp. Refer toGroup 8U - Chime/Buzzer Warning Systems for moreinformation.

SECURITY LAMPThe security lamp is controlled by the vehicle theft

alarm system. It gives the driver an indication of thestatus of the theft alarm system. Refer to Group 8Q -Vehicle Theft Alarm for more information.

TURN SIGNAL INDICATOR LAMPSThe left and right turn signal indicator lamps are

controlled by the turn signal and hazard warning(multi-function) switches. One side of the bulb foreach lamp is grounded at all times. The other side ofthe bulb receives battery feed through the contacts ofthe multi-function switch when the turn signal lever(multi-function switch stalk) or hazard warning but-ton are actuated. Refer to Group 8J - Turn Signaland Hazard Warning Systems for more information.

UPSHIFT INDICATOR LAMPVehicles equipped with manual transmissions have

an optional upshift indicator lamp. Ground feed forthe lamp is switched by the Powertrain Control Mod-ule (PCM). The lamp lights to indicate when thedriver should shift to the next highest gear for bestfuel economy. The PCM will turn the lamp off after 3to 5 seconds if the upshift is not performed. The lampwill remain off until the vehicle stops acceleratingand is brought back to the range of lamp operation,or until the transmission is shifted into another gear.

The indicator lamp is normally on when the igni-tion switch is turned ON and is turned off when theengine is started. The lamp will be turned on duringvehicle operation according to engine speed and load.

CLUSTER ILLUMINATION LAMPSAll cluster illumination lamps receive battery feed

from the instrument lamps fuse in the fuseblockmodule through the instrument panel dimming mod-ule and the headlamp switch. When the park orheadlamps are on, the cluster illumination lampslight. Illumination brightness can be adjusted bymoving the sliding dimmer switch knob (left to dim,right to brighten). Refer to Body Diagnostic Proce-dures manual for diagnosis of the instrument panellamps dimming module.


GRAPHIC DISPLAY MODULEA four-wheel drive Graphic Display Module (GDM)

is standard equipment on all Grand Cherokee 4WDmodels, unless the optional Vehicle Information Cen-ter (described elsewhere in this group) has been se-lected. The module is mounted in the lower centerarea of the instrument panel, above the ash receiverand below the climate controls.

The display consists of a back-lit screen with a ve-hicle outline, and bulbs that light the four wheels ap-propriately as determined by the state of a transfercase switch to indicate the four-wheel drive systemmode of operation. The display also includes up tothree indicator lamps labeled Part-Time, Full-Time,and Lo.

The bulbs, wiring, and transfer case switches areavailable for service. However, if the GDM screen,housing or internal circuitry are damaged or faultythe entire module must be replaced.

VEHICLE INFORMATION CENTERThe Vehicle Information Center (VIC) is an avail-

able option on Grand Cherokee models. The VIC con-sists of multi-colored vacuum-fluorescent displayscreen with a vehicle outline. It is mounted in thelower center area of the instrument panel, above theash receiver and below the climate controls. The VICreplaces the standard equipment Graphic DisplayModule (GDM), which is covered elsewhere in thisgroup. The VIC module can not be repaired. If faultyor damaged, the entire module must be replaced.

The VIC is able to display four functions in achoice of five languages (English, French, German,Italian or Spanish) and using U.S. or metric mea-surements. These functions include:• display the current time, day, and date• monitor specific vehicle operating systems andalert the driver if a malfunction occurs• display a service reminder or the distance to thenext service interval• display the selected 4WD transfer case mode of op-eration.

When the ignition switch is turned ON, the modulewill display a MILES (KM)-TO-SERVICE messagefor 6 seconds. If the distance remaining to service iszero, the module will instead display a PERFORMSERVICE message for 11 seconds. Then an audiblealarm will pulse 6 sequences of warning beeps. ThePERFORM SERVICE message will continue for anadditional 2 seconds.

Next, if no monitored system faults exist and thetime/date has been previously set, the module willdisplay the current time and date. If a service faultexists, the module will begin to display the fault mes-sage. If more than one message has to be displayed,the module will display up to 2 messages. Then the

clock function will pulse (unless a door is open andvehicle is at critical speed) continuously at 3 secondintervals.

CONTROLSOn the right side of the VIC module are the VIC

SET and SELECT buttons. These buttons are used tocontrol and customize the VIC display during the ini-tial set-up procedure, to enter the VIC into its self-diagnostic mode, and for certain other functions. TheVIC display can also be switched from U.S. custom-ary to metric measurement using the US/METRICbutton in the overhead console. See the VIC InitialSet-Up chart in this group, or refer to the vehicleOwner’s Manual for more information on the use andoperation of the VIC controls.

CLOCK/CALENDAR DISPLAYThe clock/calendar function will be displayed dur-

ing normal vehicle operation, unless a warning orservice system fault is detected. The clock/calendardisplay will include the following:• time (hours and minutes with AM and PM, except24 hour clock mode)• day of week (Monday through Sunday)• date (month and day).

OPERATING SYSTEMS MONITORThe VIC monitors 11 vehicle operating systems.

The specific vehicle operating systems monitored bythe VIC are:• right front door ajar switch• left front door ajar switch• right rear door ajar switch• left rear door ajar switch• liftgate/flipper glass ajar switch• rear lamp outage module• turn signal system• washer fluid level sensor• coolant level sensor• electrical system voltage• 4WD transfer case switch.

If a fault is detected in any of these systems, anarea of the vehicle display outline will illuminate anda message will be displayed. To alert the driver, anaudible warning signal (beeps) will occur the firsttime the message appears as indicated in the follow-ing paragraphs.

DOOR AJAR/LIFTGATE OPENThese messages are displayed when a door jamb or

liftgate/flipper glass ajar switch is grounded (closed).For the left front door only, when the door is openand the vehicle speed is greater that 10 MPH, theaudible signal will sound. This same warning will besounded when the right front or either rear door isopen, and the vehicle speed is greater that 2 MPH.


REAR LAMP FAILUREThis message is displayed when the lamp outage

module input is open for 1/2 second. This display islatched on until the ignition switch is cycled to OFFand ON, following correction.

TURN SIGNAL ONThis message is turned on if 1 mile has elapsed

with a turn signal left on.

CHECK BATTERYThis message is turned on when the ignition volt-

age is not between 11.5 and 15.1 volts. The reading ischecked every 15 seconds for an over or under bat-tery voltage. It takes 2 consecutive 15 second averagereadings to turn the message on and 1 average read-ing to remove it.

WASHER FLUID LOWThis message is turned on when the signal from

the washer fluid level sensor indicates a low fluidcondition. It takes 30 consecutive low averaged sam-ples to determine the washer fluid level is low. Thisdisplay is latched on until the ignition switch is cy-cled to OFF and ON, following correction.

COOLANT LEVEL LOWThe module will test the coolant level sensor input

immediately after ignition ON and determine if thereis a fault. Thereafter, the input is checked every 1second. It takes 30 consecutive low averaged samplesto determine the coolant level is low. This display islatched on until the ignition switch is cycled to OFFand ON, following correction.

SERVICE REMINDERSThe VIC system includes a distance-to-service

counter and detects faulty sensors. See the VIC ResetProcedures chart in this group for information on re-setting the distance-to-service counter. See the VICInitial Set-Up chart in this group for information onsetting the desired service interval. The followingparagraphs describe the service messages that willbe displayed if a fault is detected.

PERFORM SERVICEThis message is displayed at ignition ON any time

the distance-to-service counter is equal to zero.

XXXX MILES (KM)-TO-SERVICEThis message is displayed at ignition ON or when

SELECT is pressed after the time/date has been set.The distance-to-service counter must not equal zerofor the message to display. The distance is expressedin MILES or KILOMETERS (km) depending on thestate of the US/METRIC switch in the overhead con-sole.

COOLANT LEVEL SENSOR BADThe module displays a Coolant Sensor Bad mes-

sage as part of the warning message when it detectsan open or short circuit to the coolant level sensor.See VIC Fluid Level Fault Diagnosis chart in thisgroup for more information.

WASHER SENSOR BADThe module displays a Washer Sensor Bad message

as part of the warning message when it detects anopen or short circuit to the washer fluid level sensor.See VIC Fluid Level Fault Diagnosis chart in thisgroup for more information.

FOUR-WHEEL DRIVE DISPLAYThe VIC will light the wheels of the vehicle outline

and nomenclature as outlined in the VIC 4WD Dis-play Characteristics chart in this group.

VIC SELF-DIAGNOSTICSThe module will perform certain self-tests without

the use of special tools. See VIC Self-Diagnosis chartin this group for more information. The VIC programwill stay in self-diagnostics mode until all the testspass or the ignition switch is turned OFF.

The self-diagnostic routine is able to perform thefollowing checks:• microcomputer ram/rom/timer test• display screen test• coolant/washer/rear lamp/four-wheel drive sensorinput tests.


DIAGNOSIS

GAUGESIf an individual gauge is inoperative, see the diag-

nostic procedure under the heading for that gauge. Ifmore than one gauge is inoperative, perform the fol-lowing:

(1) Check fuse 22 in the fuseblock module. If OK,go to next step. If not OK, replace fuse.

(2) Check for battery voltage at fuse 22 with igni-tion switch in ON position. If OK, go to next step. Ifnot OK, repair open in circuit from ignition switchand/or refer to Group 8D - Ignition Systems for test-ing of ignition switch.

(3) Turn ignition switch to OFF. Disconnect batterynegative cable. Remove dash pad and cluster assem-bly. Disconnect printed circuit connector.

(4) Connect battery negative cable. Turn ignitionswitch to ON. Check for battery voltage at cavity C12of printed circuit connector. If OK, go to next step. Ifnot OK, repair open in circuit from fuse as required.

(5) Turn ignition switch to OFF. Disconnect batterynegative cable. Probe ground cavity of printed circuitconnector. Check for continuity to a good ground.There should be continuity. If OK, replace printedcircuit. If not OK, repair open circuit to ground as re-quired.

COOLANT TEMPERATURE GAUGEThe diagnosis found here addresses an inoperative

gauge condition. If the problem being diagnosed is re-lated to gauge accuracy, be certain to confirm thatproblem is with gauge and not with cooling systemperformance. Actual engine coolant temperatureshould be checked with a test gauge or thermometerand compared to gauge readings before you proceedwith gauge diagnosis. Refer to Group 7 - Cooling Sys-tem for more information.

(1) Turn ignition switch to ON. Disconnect coolanttemperature sending unit connector (Fig. 1 or 2). Thegauge needle should move to low end of gauge scale.If OK, go to next step. If not OK, go to step 3.

(2) Install a jumper wire from sending unit wiringto ground. The gauge needle should move to high endof gauge scale. If OK, replace sending unit. If notOK, remove jumper wire and go to next step.


(4) Probe cavity D11 of printed circuit connector.Check for continuity to a good ground. There shouldbe no continuity. If OK, go to next step. If not OK,repair short in circuit as required.

(5) Still probing cavity D11 of printed circuit con-nector, check for continuity to sending unit wiringconnector. There should be continuity. If OK, replacegauge. If not OK, repair open in circuit as required.

FUEL GAUGEThe diagnosis found here addresses an inoperative

gauge condition. If the problem being diagnosed is re-lated to gauge accuracy, be certain to confirm thatproblem is with gauge and not with fuel tank. In-spect fuel tank for signs of damage or distortion thatcould affect sending unit performance before you pro-ceed with gauge diagnosis. Refer to Group 14 - FuelSystem for more information.

(1) Turn ignition switch to ON. Disconnect fuelgauge sending unit connector. Connector is located ontop of the fuel tank. The gauge needle should moveto low end of gauge scale. If OK, go to next step. Ifnot OK, go to step 4.

(2) Connect a jumper wire between sending unitconnector cavity 2 and cavity 3 (Fig. 3) in the bodyhalf of the fuel gauge sending unit connector. Thegauge needle should move to high end of gauge scale.

Fig. 1 Coolant Temperature Sending Unit - 4.0LEngine

Fig. 2 Coolant Temperature Sending Unit - 5.2LEngine


If OK, refer to Group 14 - Fuel System for procedureto replace sending unit. If not OK, remove jumperwire and go to next step.

(3) Turn ignition switch to OFF. Disconnect batterynegative cable. Check for continuity between fuelgauge sending unit connector cavity 2 in the bodyhalf of connector and a good ground. There should becontinuity. If OK, go to next step. If not OK, repaircircuit to ground as required.

(4) Remove dash pad and cluster assembly. Discon-nect printed circuit connector.

(5) Probe cavity D6 of printed circuit connector.Check for continuity to a good ground. There shouldbe no continuity. If OK, go to next step. If not OK,repair short circuit as required.

(6) Still probing cavity D6 of printed circuit con-nector, check for continuity to fuel gauge sendingunit connector cavity 3. There should be continuity. IfOK, replace gauge. If not OK, repair open circuit asrequired.

OIL PRESSURE GAUGEThe diagnosis found here addresses an inoperative

gauge condition. If the problem being diagnosed is re-lated to gauge accuracy, be certain to confirm thatproblem is with gauge and not with engine oiling sys-tem performance. Actual engine oil pressure shouldbe checked with a test gauge and compared to gaugereadings before you proceed with gauge diagnosis.Refer to Group 9 - Engines for more information.

(1) Turn ignition switch to ON. Disconnect oil pres-sure sending unit connector (Fig. 4 or 5). The gaugeneedle should move to high end of gauge scale. If OK,go to next step. If not OK, go to step 3.

(2) Install a jumper wire from sending unit wireconnector to ground. The gauge needle should moveto low end of gauge scale. If OK, replace sendingunit. If not OK, remove jumper wire and go to nextstep.


(4) Probe cavity C9 of printed circuit connector andcheck for continuity to a good ground. There shouldbe no continuity. If OK, go to next step. If not OK,repair short circuit as required.

(5) Still probing cavity C9 of printed circuit con-nector, check for continuity to sending unit wire con-nector. There should be continuity. If OK, replacegauge. If not OK, repair open circuit as required.

SPEEDOMETER/ODOMETERThe diagnosis found here addresses an inoperative

gauge condition. If the problem being diagnosed is re-lated to gauge accuracy, be certain to confirm thatproblem is with gauge and not with incorrect speed-

Fig. 3 Fuel Gauge Sending Unit Connector

Fig. 4 Oil Pressure Sending Unit - 4.0L Engine

Fig. 5 Oil Pressure Sending Unit - 5.2L Engine


ometer pinion, axle ratio or tire size. Refer to Group21 - Transmission and Transfer Case for more infor-mation.

(1) Perform vehicle speed sensor test as describedin the appropriate Powertrain Diagnostic Proceduresmanual. If OK, go to next step. If not OK, replace ve-hicle speed sensor.

(2) Disconnect battery negative cable. Unplug vehi-cle speed sensor, PCM, vehicle information center (ifequipped), and transmission control module (ifequipped) connectors. Remove dash pad and clusterassembly. Disconnect printed circuit connector.

(3) Probe cavity C7 of printed circuit connector.Check for continuity to a good ground. There shouldbe no continuity. If OK, go to next step. If not OK,repair short circuit as required.

(4) Still probing cavity C7 of printed circuit con-nector, check for continuity to cavity 1 of vehiclespeed sensor connector (Fig. 6). There should be con-tinuity. If OK, replace speedometer/odometer. If notOK, repair open circuit as required.

TACHOMETER(1) With engine running, check for tachometer sig-

nal at pin 43 of PCM connector (Fig. 7). See Tachom-eter Calibration chart in Specifications. If OK, go tonext step. If not OK, replace PCM.

(2) Disconnect battery negative cable. Unplug PCMconnector. Remove dash pad and cluster assembly.Disconnect printed circuit and transmission controlmodule (if equipped) connectors.

(3) Probe cavity D5 of printed circuit connector.Check for continuity to a good ground. There shouldbe no continuity. If OK, go to next step. If not OK,repair short circuit as required.

(4) Still probing cavity D5 of printed circuit con-nector, check for continuity to cavity 43 of PCM con-nector. There should be continuity. If OK, replacetachometer. If not OK, repair open circuit as re-quired.

TRIP ODOMETERIf the trip odometer is inoperative, but the speed-

ometer/odometer functions are unaffected, replacespeedometer assembly. If speedometer/odometer func-tions are affected, see Speedometer/Odometer diagno-sis in this section.

VOLTMETER(1) Turn ignition switch to ON. Voltmeter should

read battery voltage. If all gauges except voltmeterare OK, go to next step. If other gauges are inopera-tive, see Gauges in this section for diagnosis.

(2) Using an accurate test voltmeter, measure bat-tery voltage at battery. Compare this reading to in-strument cluster voltmeter reading. Now seeVoltmeter Calibration chart in Specifications. If volt-meter does not perform to specification, replace volt-meter.

INDICATOR LAMPSIf an individual indicator lamp is inoperative, see

the diagnostic procedure under the heading for thatlamp. If more than one indicator lamp or a combina-tion of lamps and gauges in the instrument cluster ormessage center is inoperative, see Gauges in this sec-tion for diagnosis.

AIRBAG INDICATOR LAMP(1) Remove dash pad and cluster assembly. Do not

unplug cluster connector.(2) Turn ignition switch to ON position. Ground in-

strument cluster connector pin C11. Lamp shouldlight. If OK, go to next step. If not OK, replace bulb.

Fig. 6 Vehicle Speed Sensor Connector

Fig. 7 Powertrain Control Module Connector


INSTRUMENT CLUSTER


(3) Turn ignition switch to OFF position. Discon-nect and isolate the battery negative (ground) cable.Check for continuity between connector pin C11 andpin 3 of the airbag control module (ACM) connector.There should be continuity. If OK, refer to Group 8M- Restraint Systems for diagnosis of ACM. If not OK,repair open circuit as required.

ANTI-LOCK BRAKE SYSTEM LAMPThe diagnosis found here addresses an inoperative

lamp condition. If the ABS lamp stays on with the ig-nition switch in the ON position, or comes on andstays on while driving, refer to Group 5 - Brakes fordiagnosis. If no ABS problem is found, the followingprocedure will help locate a short or open in the ABSlamp circuit.

(1) Turn ignition switch to ON.(2) Jump instrument cluster connector terminal C3

to ground. Lamp should light. If bulb is OK, checkfor continuity between C3 and the ABS module con-nector. Refer to Group 5 - Brakes.

BRAKE WARNING LAMPThe diagnosis found here addresses an inoperative

lamp condition. If the brake warning lamp stays onwith the ignition switch in the ON position and theparking brake released, refer to Group 5 - Brakes fordiagnosis. If no service brake or parking brake prob-lem is found, the following procedure will help locatea short circuit or faulty switch.

(1) Turn ignition switch to START position. Lampshould light. Release ignition switch to ON position.Lamp should go OFF. If not OK, go to next step.

(2) Jump cluster connector terminal C4 to ground.Lamp should light. If bulb is OK, check for continuityto brake pressure warning switch and park brakeswitch.

HEADLAMP HIGH BEAM INDICATOR LAMP(1) Check that headlamp high beams are func-

tional. If OK, go to next step. If not OK, refer toGroup 8L - Lamps for diagnosis of headlamp system.

(2) Disconnect battery negative cable. Removedash pad and cluster assembly. Unplug printed cir-cuit connector. Connect battery negative cable. Turnheadlamps on and select high beam. Check for bat-tery voltage at cavity C13 of printed circuit connec-tor. If OK, replace indicator bulb. If not OK, refer toBody Diagnostic Procedures manual for diagnosis ofinstrument panel lamps dimming module.

LOW FUEL WARNING LAMP(1) Perform diagnosis for fuel gauge. The fuel

gauge and low fuel warning lamp use the same cir-cuit and sending unit. If wiring and sending unit areOK, go to next step. If not OK, repair as required.

(2) Remove dash pad and instrument cluster. Re-place low fuel warning bulb. Test operation. If notOK, replace low fuel warning module.

The low fuel warning module is serviced aspart of the tachometer assembly. If faulty, re-place the tachometer.

MALFUNCTION INDICATOR LAMPThe diagnosis found here addresses an inoperative

lamp condition. If the lamp comes on and stays onwith engine running, refer to Group 14 - Fuel Systemfor diagnosis. If no fuel or emission system problemis found, the following procedure will help locate ashort or open in the lamp circuit.

(1) Disconnect battery negative cable. Unplug PCMconnector. Install a jumper wire between cavity 32 ofPCM connector (Fig. 8) and a good ground. Connectbattery negative cable. Turn ignition switch to ON.Lamp should light. Remove jumper wire and lampshould go OFF. If OK, refer to Powertrain DiagnosticProcedures to check PCM. If not OK, go to next step.

(2) Turn ignition switch to OFF. Disconnect battery

negative cable. Remove dash pad and cluster assem-bly. Install a jumper wire between cavity C5 ofprinted circuit connector and a good ground. Connectbattery negative cable. Turn ignition switch to ON.Lamp should light. If OK, go to next step. If not OK,replace bulb.

(3) Turn ignition switch to OFF. Disconnect batterynegative cable. Unplug printed circuit connector.Check for continuity between cavity C5 of printed cir-cuit connector and a good ground. There should be nocontinuity. If OK, go to next step. If not OK, repairshort circuit to PCM as required.

Fig. 8 Powertrain Control Module Connector


(4) Check continuity between cavity C5 of printedcircuit connector and cavity 32 of PCM connector.There should be continuity. If not OK, repair opencircuit to PCM as required.

SEAT BELT REMINDER LAMP(1) Refer to Group 8U - Chime/Buzzer Warning

Systems to check chime/buzzer module operation. IfOK, go to next step. If not OK, replace chime/buzzermodule.

(2) Disconnect battery negative cable. Removedash pad and cluster assembly. Install a jumper wirebetween cavity C14 of printed circuit connector and12 volts. Bulb should light. If OK, repair circuit tochime/buzzer module. If not OK, replace bulb.

SECURITY LAMP(1) Remove dash pad and cluster assembly. Do not

unplug cluster connector.(2) Jump cluster connector terminal D16 to

ground. Lamp should light. If OK, check circuit to ve-hicle theft alarm module. If not OK, replace bulb.

TURN SIGNAL INDICATOR LAMPS(1) Disconnect battery negative cable. Remove

dash pad and cluster assembly. Probe cavity D8 ofprinted circuit connector. Check for continuity to agood ground. There should be continuity. If OK, go tonext step. If not OK, repair open circuit to ground.

(2) Connect battery negative cable. Install ajumper wire from cavity D2 (left indicator) or cavityC16 (right indicator) of printed circuit connector to a12-volt battery feed. Lamp should light. If OK, con-tinue to next step. If not OK, replace bulb.

(3) Disconnect battery negative cable. Check forcontinuity between cavity D2 (left indicator) or cavityC16 (right indicator) of printed circuit connector andleft front turn signal or right front turn signal wir-ing. There should be continuity. If OK, refer to Group8J - Turn Signal and Hazard Warning Systems forfurther diagnosis. If not OK, repair open circuit asrequired.

UPSHIFT INDICATOR LAMP(1) Disconnect battery negative cable. Unplug PCM

connector. Connect battery negative cable. Turn igni-tion switch to ON. Install a jumper wire from cavity54 of PCM connector to a good ground. Lamp should

light. Remove jumper from ground. Lamp should gooff. If OK, refer to Powertrain Diagnostic Proceduresmanual to diagnose PCM. If not OK, turn ignitionswitch to OFF and go to next step.

(2) Disconnect battery negative cable. Removedash pad and cluster assembly. Install a jumper wirefrom cavity C8 of cluster connector to a good ground.Connect battery negative cable. Turn ignition switchto ON. Lamp should light. If OK, go to next step. Ifnot OK, replace bulb.

(3) Turn ignition switch to OFF. Disconnect batterynegative cable. Unplug cluster connector. Check forcontinuity between cavity C8 of cluster connector anda good ground. There should be no continuity. If OK,go to next step. If not OK, repair short circuit as re-quired.

(4) Check for continuity between cavity C8 of clus-ter connector and cavity 54 of PCM connector. Thereshould be continuity. If not OK, repair open circuit asrequired.

CLUSTER ILLUMINATION LAMPS(1) Check fuse 24 in fuseblock module. If OK, go to

next step. If not OK, replace fuse.(2) Remove dash pad and cluster assembly. Install

a jumper wire from cluster connector cavity D12 to a12-volt battery feed. Lamps should light. If OK, referto Body Diagnostic Procedures manual for diagnosisof instrument panel lamps dimming module. If notOK, replace bulbs.

GRAPHIC DISPLAY MODULEIf part of the GDM will not light or is not operating

properly, use the Graphic Display Module Schematicand Group 8 - Wiring Diagrams to check circuit con-tinuity between the GDM connector and the appro-priate signal source. If there is continuity and thesending device is operating properly, replace theGDM unit.

VEHICLE INFORMATION CENTERProblems with the VIC module can be diagnosed

using a combination of the diagnostic charts andschematics that follow. Also included are charts de-scribing the procedures for initial VIC set-up and re-setting of the VIC clock/calendar and servicereminder functions.


GRAPHIC DISPLAY MODULE SCHEMATIC

VIC DIAGNOSTIC MESSAGES


VIC SELF-DIAGNOSIS


VIC FLUID LEVEL FAULT DIAGNOSIS


VIC REAR LAMP FAULT DIAGNOSIS


VIC 4WD DISPLAY FAULT DIAGNOSIS


VIC

SY

ST

EM

SC

HE

MA

TIC


VIC CONNECTOR

LAMP OUTAGE MODULE CONNECTOR

4WD SWITCH STATES

VIC 4WD DISPLAY CHARACTERISTICS

DRIVE SYSTEM(TRANSFER CASE)

VIC 4WD DISPLAYCHARACTERISTICS

TRANSFER CASE SHIFT LEVER POSITION

2WD 4 PART TIME 4 FULL/ALL TIME NEUTRAL 4 LO

4WD QUADRA-TRAC(NP249)

Nomenclature N/A N/A None None ‘‘LO’’

Lighted Wheels N/A N/A All None All

4WD SELEC-TRAC(NP242)

Nomenclature None ‘‘PART TIME’’ ‘‘FULL TIME’’ None ‘‘PART TIME’’

Lighted Wheels Rear All All None All

4WD COMMAND- TRAC(NP231)

Nomenclature None ‘‘PART TIME’’ N/A None ‘‘PART TIME’’

Lighted Wheels Rear All N/A None All

2WD(NONE)

Nomenclature None N/A N/A N/A N/A

Lighted Wheels None N/A N/A N/A N/A

N/A=Not Applicable J958E-42


VIC INITIAL SET-UP


VIC RESET PROCEDURES


TRANSFER CASE SWITCHESThe transfer case switches used for the GDM and

the VIC are the same. See the Transfer CaseSwitches chart to check switch operation for the ap-

propriate transfer case. If switch is OK, see diagnosisfor the GDM or VIC in this group, as required. Referto Group 21 - Transmission and Transfer Case forswitch service procedures.

TRANSFER CASE SWITCHES


SERVICE PROCEDURES

INSTRUMENT CLUSTER REMOVE/INSTALL(1) Disconnect battery negative cable.(2) Remove ash receiver.(3) Remove 6 screws holding center cluster bezel

(Fig. 9).

(4) Remove center bezel.(5) Remove 2 screws that were behind center bezel

holding dash pad.(6) Gently pry defroster grille out of dash pad.(7) Unplug auto headlamp and sun sensors (if

equipped) and set defroster grille aside.(8) Remove 4 screws in defroster duct opening

holding dash pad (Fig. 10).(9) Remove 3 screws above instrument panel clus-

ter holding dash pad (Fig. 11).(10) Open glove box and remove 2 screws holding

dash pad.(11) Remove dash pad by pulling up to unsnap end

clips.(12) Remove 3 screws from the top of the cluster

(Fig. 12).(13) Lift cluster straight up far enough to allow ac-

cess to connector. Unplug connector and remove clus-ter.

(14) Reverse removal procedures to install.

GAUGES REMOVE/INSTALL(1) Remove instrument cluster as described in In-

strument Cluster Remove/Install.(2) Remove 4 screws from bottom of lens and lift

lens off from bottom (Fig. 13).(3) Pull off trip odometer reset knob.(4) Remove mask by lifting from bottom. Mask is

snapped in along the top.

CAUTION: Do not touch the face of a gauge or theback of the lens with your finger. It will leave a per-manent finger print.

(5) Remove the required gauge set attachingscrews from the rear of mounting bezel (Fig. 14). Re-move coolant temperature/oil pressure or voltmeter/

Fig. 9 Center Bezel Retaining Screws

Fig. 10 Upper Dash Pad Attaching Screws

Fig. 11 Remove Screws Holding Dash Pad

Fig. 12 Instrument Cluster Attaching Screws


Fig. 13 Instrument Cluster


fuel gauge set from front. Remove tachometer withprinted circuit or speedometer/odometer with printedcircuit from the back.

(6) Reverse removal procedures to install.

PRINTED CIRCUIT REMOVE/INSTALL(1) Remove instrument cluster as described in In-

strument Cluster Remove/Install.(2) Remove 4 screws from bottom of lens and lift

lens off from bottom.(3) Pull off trip odometer reset knob.(4) Remove mask by lifting from bottom. Mask is

snapped in along the top.

CAUTION: Do not touch the face of a gauge or theback of the lens with your finger. It will leave a per-manent finger print.

(5) Remove all attaching screws for gauges, ta-chometer, and speedometer that are contacting theprinted circuit (Fig. 14).

(6) Remove 2 screws holding the cluster connectorto the bezel (Fig. 15).

(7) Remove the lamp sockets from the circuitboard.

(8) Lift the connector up to unfold the printed cir-cuit (Fig. 16). Remove the printed circuit includingthe connector.

(9) Reverse the removal procedures to install.

SWITCH PODS REMOVE/INSTALL(1) Disconnect battery negative cable.(2) Remove ash receiver.

Fig. 14 Printed Circuit Remove/Install

Fig. 15 Cluster Connector Retaining Screws


(3) Remove 6 screws holding center cluster bezel(Fig. 17).

(4) Remove center bezel.

(5) Remove 2 screws holding dash pad located be-hind top of center bezel.

(6) Gently pry defroster grille out of dash pad.(7) Unplug automatic headlamp and sun sensors

(if equipped) and set defroster grille aside.(8) Remove 4 screws in defroster duct opening

holding dash pad (Fig. 18).

(9) Remove 3 screws above instrument panel clus-ter holding dash pad (Fig. 19).

(10) Open glove box and remove 2 screws holdingdash pad.

(11) Remove dash pad by pulling up to unsnap endclips.

Fig. 16 Printed Circuit and Cluster Connector

Fig. 17 Center Bezel Retaining Screws

Fig. 18 Upper Dash Pad Attaching Screws

Fig. 19 Remove Screws Holding Dash Pad


(12) With left front door open, remove 1 screw fromthe side of the lower trim panel (Fig. 20).

(13) Remove 4 screws holding the steering columncover (Fig. 21).

(14) Remove 1 screw from bottom of lower trimpanel and pull panel off. There is also a clip holdingthe panel to the instrument panel.

(15) Remove 6 screws holding knee blocker.(16) Remove steering column retaining nuts.(17) Remove 3 screws holding bottom of bezels

(Fig. 22).

(18) Remove 2 screws holding top of end andswitch pod bezels (Fig. 23). The end bezel can now beremoved.

Fig. 20 Lower Trim Panel

Fig. 21 Steering Column Cover and Knee Blocker

Fig. 22 Remove Screws Holding Bottom Of Bezels

Fig. 23 Remove Screws Holding Top Of Bezels


(19) Remove 2 screws holding left side of switch podbezel (Fig. 24).

(20) Remove 3 screws holding right side of switchpod bezel (Fig. 25).

(21) Pull switch pod bezel out far enough to re-move switch connectors. Disconnect connectors fromeach switch pod and remove bezel (Fig. 26).

Fig. 24 Left Switch Pod Bezel Screws

Fig. 25 Right Switch Pod Bezel Screws

Fig. 26 Rear View of Switch Pod Bezel


(22) Remove required switch attaching screws andswitch.

(23) Reverse removal procedures to install. Tightensteering column retaining nuts to 105 in. lbs. (12Nzm).

GDM/VIC REMOVE/INSTALL(1) Disconnect battery negative cable.(2) Remove ash receiver.(3) Remove 6 screws holding center cluster bezel

(Fig. 29).

(4) Remove center bezel.(5) Remove 3 screws holding GDM/VIC (Fig. 30).(6) Pull module out far enough to unplug connec-

tor. Remove module.

Fig. 27 Rear View of Left Switch Pod

Fig. 28 Rear View of Right Switch Pod

Fig. 29 Remove Center Bezel Retaining Screws

Fig. 30 Module Attaching Screws


SPECIFICATIONS

COOLANT LEVEL SENSOR REMOVE/INSTALL WASHER FLUID LEVEL SENSOR REMOVE/INSTALL


95zj_8e.pdf

Automotive

zj instrument panel

basic instrument cluster

signal indicator

instrument clusters

gauges removal

gauge needle

gauge pointer

lower instrument panel