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Audio System

Refer to Wiring Diagrams Section 415-00, Audio System--General Information for schematic and connector information.

Inspection and Verification

1. NOTE: The audio control module (ACM) is also referred to as the audio unit.

Verify the customer concern by operating the electronic audio system with the engine running and the vehicle in and out of motion.

2. Visually inspect for obvious signs of mechanical and electrical damage. Visual Inspection Chart

3. If the fault is not visually evident, proceed to diagnose the audio control module (ACM) by:

� entering the New Generation STAR (NGS) Tester Diagnostics.

� entering ACM Self-Diagnostic Mode.

ACM Self-Diagnostic Mode

NOTE: To enter the speaker walk-around test or ACM Self-Diagnostic Mode, the ACM must be ON and in radio tuner mode (AM/FM). The ACM Self-Diagnostic Mode can only be entered while in the speaker walk-around test.

1. To enter the speaker walk-around test, simultaneously press the ACM Preset Buttons 3 and 6.

2. The speaker walk-around test stops at each speaker and applies a different tone to each speaker for about 1-2 seconds. Each speaker is tested and displayed on the ACM in the following sequence: RF, LF, LR, RR, Subwoofer I, Subwoofer II.

3. The speaker walk-around test automatically continues and tests:

� for speaker short. If a short is present, SPKR SHORT will be displayed.

� for CD/DJ. The ACM display will show NO DJ if not present.

The speaker walk-around test will end and the ACM will return to its previous setting.

To enter the following ACM self-diagnostic modes, press the preset button desired while in the speaker walk-around test. This will abort the speaker walk-around test and start the selected test.

4. The ACM Self-Diagnostic Mode has five tests available:

� Preset button 1 = Audio internal/external SELF TEST. If SELF FAIL is displayed, press TUNE > to scroll view the DTCs stored. Refer to the ACM Diagnostic Trouble Code (DTC)

Index. If the system is OK, SELF PASS is displayed.

� Preset button 2 = View/Clear continuous diagnostic trouble codes (DTCs). NO DTCS is displayed if no DTCs are retrieved. If DTCS FOUND is displayed, press TUNE > button to

view the DTCS retrieved. Refer to the ACM Diagnostic Trouble Code (DTC) Index. To clear all DTCS press the EJECT button. DTCS CLEAR will be displayed.

� Preset button 3 = SIGNAL TEST. This test measures the average strength at the current tuner setting.

� Preset button 4 = Software configuration level. This test queries each audio system controller for its software configuration level. SOFT LEVELS will be displayed upon completion of

the query. Press TUNE > to scroll view the software configuration version level.

SECTION 415-00: Audio System — General Information 2000 Lincoln LS Workshop Manual

DIAGNOSIS AND TESTING Procedure revision date: 03/17/1999

Special Tool(s)

73III Automotive Meter or equivalent 105-R0057

New Generation STAR (NGS) Tester or equivalent 418-F048 (007-00500)

Mechanical Electrical

� ACM physically damaged, misaligned, any control(s) inoperative � Digital audio compact disc player physically damaged, misaligned, any control(s) inoperative � Antenna or antenna cable physically damaged, misaligned connection(s) � Antenna isolator module physically damaged, misaligned connection(s) � Radio speakers, mounting/speaker cones physically damaged, misaligned � Radio ignition interference capacitors, radio frequency interference suppression bond, and radio receiver hood bonding strap

misaligned (also check for cleanliness and metal-to-metal contact)

� Central junction box (CJB) Fuse 202 (5A)

� CJB Fuse 227 (10A) � Battery junction box (BJB)

Fuse 414 (5A) � BJB Fuse 418 (20A) � BJB Fuse 429 (30A) � Damaged connector(s) � Damaged ignition switch � Damaged circuitry

Controller Description ACM Display Example

Main Main Micro Software Version MAIN ##.##.##

of 232000 Lincoln LS Workshop Manual

4/19/2011http://www.fordtechservice.dealerconnection.com/pubs/content/~WSYX/~...

� Preset button 5 = DISPLAY TEST. This test will light all the ACM display segments for 5 seconds and then turn all segments off. When the test is complete, DISPLAY TEST is

displayed on the bezel.

� Preset button 6 = CONFIG LEVELS. This will show the software configuration for the ACM.

5. To exit ACM Self-Diagnostic Mode, turn the ignition switch or the ACM OFF.

6. If the concern remains and the fault is not detected, proceed to New Generation STAR (NGS) Tester Diagnostics.

New Generation STAR (NGS) Tester Diagnostics

1. If the concern remains after the inspection, connect the New Generation STAR (NGS) Tester to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the NGS Tester menu. If the NGS does not communicate with the vehicle:

� check that the program card is correctly installed.

� check the connections to the vehicle.

� check the ignition switch position.

2. NOTE: The ACM must be in AM, FM1 or FM2 mode to enter NGS Tester diagnostics.

If the NGS still does not communicate with the vehicle, refer to the New Generation STAR Tester manual.

3. Carry out the DATA LINK DIAGNOSTIC TEST. If the NGS responds with:

� CKT914, CKT915 or CKT70 = ALL ECUS NO RESP/NOT EQUIP, refer to Section 418-00.

� NO RESP/NOT EQUIP for audio control module (ACM), go to Pinpoint Test A.

� SYSTEM PASSED, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out self-test diagnostics for the ACM.

4. If the DTCs retrieved are related to the concern, go to the ACM Diagnostic Trouble Code (DTC) Index to continue diagnostics.

5. If no DTCs related to the concern are retrieved, proceed to Symptom Chart to continue diagnostics.

ACM Diagnostic Trouble Code (DTC) Index

ACM Parameter Identification (PID) Index

CDSP CDSP Micro Software Version CDSP ##.##.##

ADSP ADSP Micro Software Version ADSP ##.##.##

Auxiliary Auxiliary Software Version AUX ##.##.##

CD/DJ CDDJ Software Version DJ ##.##.##

CD Changer CDR Software Version CD ##.##.##

Tape Deck Tape Deck Software Version TAP ##.##.##

RSC Rear Seat Controller Software Version RCP ##.##.##

DTC Description Source Action

B1342 ECU Is Defective ACM CLEAR and DOCUMENT the DTCs. CARRY OUT the ACM On-Demand Self-Test. REMOVE the ACM and SEND it to an authorized Ford Audio System repair facility if DTC B1342 is retrieved again.

B2401 Audio Tape Deck Mechanism Fault ACM VERIFY that no tape is inserted in the ACM. CLEAR and DOCUMENT the DTCs. CARRY OUT the ACM On-Demand self-test. If DTC B2401 is retrieved again, REMOVE the ACM and SEND it to an authorized Ford Audio System repair facility.

B2402 Audio CD/DJ Thermal Shutdown Fault

ACM GO to Pinpoint Test C.

B2403 Audio CD/DJ Internal Fault ACM GO to Pinpoint Test C.

B2404 Audio Steering Wheel Switch Circuit Fault

ACM GO to Pinpoint Test M.

B2405 Audio Single-Disc CD Player Thermal Shutdown Fault

ACM Not applicable.

B2406 Audio Single-Disc CD Player Internal Fault

ACM Not applicable.

B2477 Module Configuration Fault ACM REFER to Section 418-01.

U2003 Audio CD/D Jockey Is Not Responding

ACM NOTE: U2003 is retrieved if CDDJ is not present, disconnected, or inoperative.

GO to Pinpoint Test C.

U2005 Audio Rear Integrated Control Panel Unit Is Not Responding

ACM NOTE: U2005 is retrieved if RICP is not present, disconnected, or inoperative.

Not applicable.

U2008 Audio Phone Is Not Responding ACM REFER to Section 419-08.

U2014 Audio Subwoofer Unit Is Not Responding

ACM NOTE: U2014 is retrieved if subwoofer is not present, disconnected, or inoperative.

GO to Pinpoint Test L.

U2020 Center Image Amplifier Is Not Responding

ACM NOTE: U2020 is retrieved if center image amplifier is not present, disconnected, or inoperative.

GO to Pinpoint Test I.

Display Description Expected Value

ASYSON ASYSON output state ACTIVE, not ACT

BAND_SW Band switch (steering wheel controls) ACTIVE, not ACT



ACM Active Command Index

Symptom Chart

MEM_SW Memory switch (steering wheel controls) ACTIVE, not ACT

PHONE Phone switch (steering wheel controls) ACTIVE, not ACT

PTA PTA input state ACTIVE, not ACT

VOL+_SC Volume + switch (steering wheel controls) ACTIVE, not ACT

VOL-_SC Volume - switch (steering wheel controls) ACTIVE, not ACT

Active Command Display Action

Speaker Walk-Around Test SPEAKER WALKAROUND RF, LF, LR, RR, Subwoofer I, Subwoofer II

Symptom Chart

Condition Possible Sources Action

� No communication with the audio control module (ACM) � CJB Fuse 202 (5A). � CJB Fuse 227 (10A). � BJB Fuse 414 (5A). � BJB Fuse 429 (30A). � J1850 communication

network. � Circuitry. � ACM.

� GO to Pinpoint Test A.

� The audio unit is inoperative/does not operate correctly � CJB Fuse 202 (5A). � CJB Fuse 227 (10A). � BJB Fuse 414 (5A). � BJB Fuse 429 (30A). � Circuitry. � ACM.

� GO to Pinpoint Test B.

� The cassette player is inoperative/does not operate correctly

� ACM. � REMOVE the audio unit and SEND it to an authorized Ford audio system repair facility. TEST the system for normal operation.

� The radio does not operate correctly — display is blank � ACM. � REMOVE the audio unit and SEND it to an authorized Ford audio system repair facility. TEST the system for normal operation.

� The CD changer is inoperative/does not operate correctly

� BJB Fuse 414 (5A). � Circuitry. � ACM. � CD changer.

� GO to Pinpoint Test C.

� The audio unit does not display CD changer information � Circuitry. � ACM. � CD changer.

� GO to Pinpoint Test D.

� Noisy reception � Antenna. � Antenna connections. � Noise suppression

equipment. � Antenna isolator

module. � ACM.

� GO to Pinpoint Test E.

� Continuous SEEK/SCAN in AM/FM � Antenna. � Antenna connections. � Antenna isolator

module. � ACM.

� GO to Pinpoint Test F.

� Poor quality/distorted sound from one or more speakers (not all speakers)

� Speaker(s). � Circuitry. � Audio cable. � ACM.

� GO to Pinpoint Test G.

� Poor quality/distorted sound from all speakers � ACM. � REMOVE the audio unit and SEND it to an authorized Ford audio system repair facility. TEST the system for normal operation.

� No sound from one or more speakers (not all speakers) � Speaker(s). � Circuitry. � ACM.

� GO to Pinpoint Test H.

� No sound from one or more speakers (not all speakers) — center imaging

� Speaker(s). � Circuitry. � ACM. � Center imaging

speaker amplifier.

� GO to Pinpoint Test I.

� No sound from all speakers � Speaker(s). � Circuitry. � ACM. � Audio cable.

� GO to Pinpoint Test J.

� Loud pops when cycling the ignition switch � Subwoofer. � Circuitry.

� GO to Pinpoint Test K.

� The subwoofer is inoperative � BJB Fuse 418 (20A). � Circuitry. � Subwoofer.

� GO to Pinpoint Test L.

� No radio illumination � Circuitry. � ACM.

� REFER to Section 413-00.

� The auxiliary audio control is inoperative/does not operate correctly — steering wheel control switches

� Circuitry. � ACM. � Steering wheel control

� GO to Pinpoint Test M.



Pinpoint Tests

PINPOINT TEST A: NO COMMUNICATION WITH THE AUDIO CONTROL MODULE (ACM)

PINPOINT TEST B: THE AUDIO UNIT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY

switches. � Horn switch. � Air bag sliding contact.

� The speed sensitive volume function is inoperative/does not operate correctly

� ACM. � REMOVE the audio unit and SEND it to an authorized Ford audio system repair facility. TEST the system for normal operation.

CONDITIONS DETAILS/RESULTS/ACTIONS

A1 CHECK THE VOLTAGE TO THE ACM

ACM C240c

Measure the voltage between ACM C240c pin 9, circuit 29-MD15 (WH/BK), harness side and ground; and between ACM C240c pin 10, circuit 75-MD15 (YE/GN), harness side and ground.

� Are the voltages greater than 10 volts?

Yes GO to A2.

No REPAIR the circuit in question. REPEAT the data link diagnostic test.

A2 CHECK THE GROUND TO THE ACM

Measure the resistance between the ACM C240c pin 11, circuit 31-MD15 (BK), harness side and ground; and between C240c pin 16, circuit 31-MD15 (BK), harness side and ground.

� Are the resistances less than 5 ohms?

Yes REFER to Section 418-00.

No REPAIR the circuit in question. REPEAT the data link diagnostic test.


B1 CHECK OPERATION OF THE ACM



Turn on the ACM.

� Is the ACM display illuminated?

Yes GO to B2.

No GO to B4.

B2 CHECK FOR SOUND COMING FROM THE RADIO SPEAKERS

Carry out the speaker walk-around test by pressing Preset Buttons 3 and 6 simultaneously.

Check for sound from the radio speakers.

� Is sound coming from the speakers?

Yes GO to B3.

No GO to Pinpoint Test J.

B3 CARRY OUT CONTROLS AND FEATURES TEST

Verify that all the audio system controls and features operate correctly; refer to the owner literature.

� Do all the controls and features operate correctly?

Yes The system is OK.

No REMOVE the audio unit and SEND it to an authorized Ford audio system repair facility. TEST the system for normal operation.

B4 CHECK THE VOLTAGE TO THE ACM

ACM C240c

Measure the voltage between ACM C240c pin 10, circuit 75-MD15 (YE/GN), harness side and ground; and between ACM C240c pin 9, circuit 29-MD15 (WH/BK), harness side and ground.

� Are the voltages greater than 10 volts?

Yes GO to B5.

No REPAIR the circuit in question. TEST the system for normal operation.

B5 CHECK THE GROUND TO THE ACM

Measure the resistance between the ACM C240c pin 11, circuit 31-MD15 (BK), harness side and ground; and between C240c pin 16, circuit 31-MD15 (BK), harness side and ground.



PINPOINT TEST C: THE CD CHANGER IS INOPERATIVE/DOES NOT OPERATE CORRECTLY


Yes REMOVE the audio unit and SEND it to an authorized Ford audio system repair facility. TEST the system for normal operation.



C1 RETRIEVE THE RECORDED ACM DTCS FROM BOTH THE CONTINUOUS AND ON-DEMAND SELF-TESTS

Use the recorded results from the continuous and on-demand self-tests.

� Are any DTCs retrieved?

Yes If B2402, B2403, or U2003 is retrieved, GO to C5 .

No GO to C2. All other DTCs, GO to ACM Diagnostic Trouble Code (DTC) Index.

C2 CHECK OPERATION OF THE CD CHANGER

Turn on the ACM.

Verify that the ACM is operating correctly. Refer to the owner literature.

Verify that the CD changer power loading function is operating correctly. Refer to the owner literature.

� Is the CD player information displayed on the ACM display?

Yes GO to C3.

No GO to Pinpoint Test D.

C3 CHECK FOR SOUND COMING FROM THE RADIO SPEAKERS

Insert a known good CD and press the CD button.

Check for sound from the radio speakers.


Yes GO to C4.

No GO to Pinpoint Test J.

C4 CD CHANGER PLAY/STOP TEST

Verify that all CD changer controls and features operate correctly. Refer to the owner literature.

� Do all controls and features operate correctly?

Yes The system is OK.

No GO to C5.

C5 CHECK THE CIRCUITS BETWEEN THE COMPONENTS FOR OPEN

CD Changer C243

ACM C240a

Measure the resistances between CD changer C243 and ACM C240a as follows:



CD Changer C243 ACM C240a

pin 6, circuit 1-MD50 (WH/BK) pin 17, circuit 1-MD50 (WH/BK)

pin 5, circuit 1-MD49 (WH/GN) pin 19, circuit 1-MD49 (WH/GN)

pin 1, circuit 4-EA6 (GY) pin 6, circuit 4-EA8 (GY/VT)

pin 12, circuit 2-MD50 (GY/BK) pin 18, circuit 2-MD50 (GY/BK)

pin 11, circuit 2-MD49 (GY/OG) pin 20, circuit 2-MD49 (GY/OG)

pin 8, circuit 8-MD51 (WH/BU) pin 5, circuit 8-MD51 (WH/BU)

pin 7, circuit 5-EA6 (BU) pin 7, circuit 5-EA8 (BU/WH)


Yes GO to C6.


C6 CHECK THE CIRCUITS BETWEEN THE COMPONENTS FOR SHORT

Measure the resistance between the CD changer C243, harness side and ground as follows:

� pin 6, circuit 1-MD50 (WH/BK).

� pin 5, circuit 1-MD49 (WH/GN).

� pin 1, circuit 4-EA6 (GY).

� pin 12, circuit 2-MD50 (GY/BK).

� pin 11, circuit 2-MD49 (GY/OG).

� pin 8, circuit 8-MD51 (WH/BU).

� pin 7, circuit 5-EA6 (BU).

� Are the resistances greater than 10,000 ohms?

Yes GO to C7.


C7 CHECK VOLTAGE TO THE CD CHANGER

Measure the voltage between CD changer C243 pin 9, circuit 29-MD41 (OG), harness side and ground.

� Is the voltage greater than 10 volts?

Yes GO to C8.

No REPAIR the circuit. TEST the system for normal operation.

C8 CHECK CIRCUIT 31-MD41 (BK) FOR OPEN

Measure the resistance between CD changer C243 pin 3, circuit 31-MD41 (BK), harness side and ground.

� Is the resistance less than 5 ohms?



PINPOINT TEST D: THE AUDIO UNIT DOES NOT DISPLAY CD CHANGER INFORMATION

PINPOINT TEST E: NOISY RECEPTION

Yes REMOVE the CD changer and SEND it to an authorized Ford audio system repair facility. TEST the system for normal operation.



D1 CHECK OPERATION OF THE CD CHANGER

Turn on the ACM.

Verify that the ACM is operating correctly. Refer to the owner literature.

Verify that the CD changer power loading function is operating correctly. Refer to the owner literature.

� Is the CD changer information displayed on the ACM display?

Yes GO to Pinpoint Test C.

No GO to D2.

D2 CARRY OUT THE BEZEL DISPLAY TEST

Carry out the bezel display test. Press Preset Buttons 3 and 6 simultaneously. Within the first five seconds, while in the speaker walk-around test, press Preset Button 5. All segments of the bezel display should illuminate for approximately five seconds and DISPLAY TEST will be shown on the display.

� Does the display test illuminate all segments?

Yes GO to D3.


D3 CHECK FOR SOUND COMING FROM THE RADIO SPEAKERS

Insert a known good CD and press the CD button.



Yes REMOVE the CD changer and SEND it to an authorized Ford audio system repair facility. TEST the system for normal operation.

No GO to Pinpoint Test C.


E1 CHECK THE RADIO SIGNAL RECEPTION

Check the radio signal reception with the engine running and with the engine off.

� Is the radio signal reception noisy only with the engine running?

Yes GO to E2.

No If FM only, GO to E8 . If AM only, GO to E10 . If both FM and AM, GO to E12 .

E2 CHECK SUPPRESSION EQUIPMENT

Check all required suppression equipment, radio frequency interference suppression bond, and the hood bonding strap for security, cleanliness, and metal-to-metal contact. Refer to Section 415-01.

� Are the contacts clean, secure, and in metal-to-metal contact?

Yes GO to E3.

No INSTALL new radio frequency interference suppression bonds or related equipment, CLEAN, or SECURE the connections as necessary. TEST the system for normal operation.



E3 CHECK CAPACITOR MOUNTING AND CONNECTING CIRCUITS

NOTE: The capacitor mounting points are used to complete the electrical circuit and must be mounted securely to clean surfaces.

Check the mounting and connecting circuits of the radio ignition interference capacitor(s) for security, cleanliness, and metal-to-metal contact. Refer to Section 415-01.

� Are the contacts clean, secure, and in metal-to-metal contact?

Yes GO to E4.

No CLEAN or SECURE the connections as necessary. TEST the system for normal operation.

E4 CHECK RADIO IGNITION INTERFERENCE CAPACITOR(S) AND GENERATOR

Check the operation of the radio ignition interference capacitor(s) by installing known good component(s).

Check the generator by disconnecting the wiring harness from the voltage regulator.

Check the operation of the ACM.

� Is the noise eliminated?

Yes REPAIR or INSTALL new components as necessary. TEST the system for normal operation.

No GO to E5.

E5 CHECK IGNITION CIRCUITS

Check the ignition circuits for correct routing, grounding, and security of connections.

� Are the circuits OK?

Yes GO to E6.

No REPAIR the circuit as necessary. TEST the system for normal operation.

E6 CHECK THE IGNITION SYSTEM

Test the ignition system; refer to Section 303-07A or Section 303-07B.

� Is the ignition system OK?

Yes GO to E7.

No REPAIR the ignition system. REFER to Section 303-07A or Section 303-07B. TEST the system for normal operation.

E7 SUBSTITUTE ACM

Substitute a known good ACM.




No REINSTALL the original audio unit. USE a jumper cable to GROUND various parts of the vehicle to the frame (for example: engine, fenders, quarter panels, stone deflectors, air cleaner, body sheet metal). When the noise is eliminated, PROVIDE a permanent ground where necessary. TEST the system for normal operation.

E8 CHECK FM ANTENNA FOR DAMAGE



FM Antenna Lead

Terminal

Measure the resistance between the FM antenna cable lead terminal and the end of the FM antenna grid wire.


Yes GO to E9.

No REPAIR the antenna; REFER to Section 415-02.

E9 SUBSTITUTE FM ANTENNA EXTENSION CABLE

Substitute a known good antenna cable between the antenna isolator module and the FM antenna.



Yes INSTALL a new antenna cable; REFER to Section 415-02. TEST the system for normal operation.

No REINSTALL the original antenna cable.GO to E13 .

E10 CHECK AM ANTENNA FOR DAMAGE

Rear Window

Defroster Grid

Measure the resistance between the left side rear window defroster terminal and the right side rear window defroster terminal.

� Is the resistance less than 1 ohm?

Yes GO to E11.


E11 SUBSTITUTE AM ANTENNA EXTENSION CABLE

Substitute a known good antenna cable between the antenna isolator module and the AM antenna (rear window defroster).




No REINSTALL the original antenna cable.GO to E13 .

E12 SUBSTITUTE ANTENNA EXTENSION CABLE(S)



PINPOINT TEST F: CONTINUOUS SEEK/SCAN IN AM/FM

Substitute a known good antenna cable(s) between the antenna isolator module and the ACM.




No REINSTALL the original antenna cable. GO to E13 .

E13 SUBSTITUTE ANTENNA ISOLATOR MODULE

Substitute a known good antenna isolator module.



Yes INSTALL a new antenna isolator module; REFER to Section 415-02. TEST the system for normal operation.

No REINSTALL the original antenna isolator module. REMOVE the audio unit and SEND it to an authorized Ford audio system repair facility. TEST the system for normal operation.


F1 CHECK OPERATION OF THE SEEK/SCAN FUNCTIONS

Operate the SEEK/SCAN functions with the ACM in both AM and FM tuner modes.

� Do the SEEK/SCAN functions search continuously in both AM and FM tuner modes?

Yes GO to F6.

No If FM only, GO to F2 . If AM only, GO to F4 .

F2 CHECK FM ANTENNA FOR DAMAGE

FM Antenna Lead

Terminal

Measure the resistance between the FM antenna cable lead terminal and the end of the FM antenna grid wire.


Yes GO to F3.


F3 SUBSTITUTE FM ANTENNA EXTENSION CABLE

Substitute a known good antenna cable between the antenna isolator module and the FM antenna.






No REINSTALL the original antenna cable.GO to F7 .

F4 CHECK AM ANTENNA FOR DAMAGE

Rear Window Defroster

Grid

Measure the resistance between the left side rear window defroster terminal and the right side rear window defroster terminal.

� Is the resistance less than 1 ohm?

Yes GO to F5.


F5 SUBSTITUTE AM ANTENNA EXTENSION CABLE

Substitute a known good antenna cable between the antenna isolator module and the AM antenna (rear window defroster).




No REINSTALL the original antenna cable. GO to F7 .

F6 SUBSTITUTE ANTENNA EXTENSION CABLE

Substitute a known good antenna cable between the antenna isolator module and the ACM.




No REINSTALL the original antenna cable. GO to F7 .

F7 SUBSTITUTE ANTENNA ISOLATOR MODULE

Substitute a known good antenna isolator module.



PINPOINT TEST G: POOR QUALITY/DISTORTED SOUND FROM ONE OR MORE SPEAKERS (NOT ALL SPEAKERS)


� Do the SEEK/SCAN functions operate correctly?

Yes INSTALL a new antenna isolator module; REFER to Section 415-02. TEST the system for normal operation.

No REINSTALL the original antenna isolator module. REMOVE the audio unit and SEND it to an authorized Ford audio system repair facility. TEST the system for normal operation.


G1 CHECK FOR POOR SOUND

Turn on the ACM.


� Do all the radio speakers have poor sound quality?


No GO to G2.

G2 CHECK THE CIRCUITS TO THE SPEAKER(S)

ACM C240c

Poor Sounding Radio

Speaker(s)

Measure the resistances between the distorted radio speaker connector and ACM C240c; and between the following distorted radio speaker connector pins, harness side and ground as follows:

Speaker Speaker Connector ACM C240c Pin Circuit

LR C702 13 10-MD11 (GY/WH)

LR C702 12 8-MD11 (WH/VT)

LF C523 15 10-MD10 (GY/BK)

LF C523 14 8-MD10 (WH/BK)

RR C802 6 10-MD18 (GY)

RR C802 5 8-MD18 (WH)

RF C612 8 10-MD17 (GY/RD)

RF C612 7 8-MD17 (WH/RD)

� Are the resistance(s) less than 5 ohms between the distorted radio speaker connector(s) and the ACM, and greater than 10,000 ohms

between the radio speaker connector(s) and ground?

Yes GO to G3.


G3 CHECK THE SPEAKER

Substitute the poor quality speaker with a known good component.

� Is the sound quality OK?

Yes INSTALL a new radio speaker(s). TEST the system for normal operation.



PINPOINT TEST H: NO SOUND FROM ONE OR MORE SPEAKERS (NOT ALL SPEAKERS)



H1 CHECK FOR SOUND

Turn on the ACM.


� Are all the radio speakers without sound?

Yes GO to Pinpoint Test J. .

No GO to H2.

H2 CHECK THE CIRCUITS BETWEEN THE SPEAKER(S) AND THE ACM

ACM C240c

Silent Radio Speaker

(s)

Measure the resistance between the silent radio speaker connector and ACM C240c; and between the silent radio speaker connector, harness side and ground as follows:

Speaker Speaker Connector ACM C240c Pin Circuit

LR C702 13 10-MD11 (GY/WH)

LR C702 12 8-MD11 (WH/VT)

LF C523 15 10-MD10 (GY/BK)

LF C523 14 8-MD10 (WH/BK)

RR C802 6 10-MD18 (GY)

RR C802 5 8-MD18 (WH)

RF C612 8 10-MD17 (GY/RD)

RF C612 7 8-MD17 (WH/RD)

� Are the resistance(s) less than 5 ohms between the radio speaker connector(s) and the ACM, and greater than 10,000 ohms between the radio

speaker connector(s) and ground?

Yes GO to H3.


H3 SUBSTITUTE SPEAKER

Substitute a known good radio speaker for each silent radio speaker.

Turn on the ACM.

� Are the known good radio speaker(s) silent?


No INSTALL a new radio speaker(s) in question. TEST the system for normal operation.



PINPOINT TEST I: NO SOUND FROM ONE OR MORE SPEAKERS (NOT ALL SPEAKERS) — CENTER IMAGING


I1 CHECK FOR SOUND

Turn on the ACM.



Yes GO to Pinpoint Test J.

No If one center imaging speaker is inoperative, GO to I2 . If both center imaging speakers are inoperative, GO to I4 .

I2 CHECK THE CIRCUITS BETWEEN THE SPEAKER(S) AND THE CENTER IMAGING AMPLIFIER

Center Imaging Amplifier C225

Silent Radio Speaker(s)

Measure the resistance between the silent radio speaker connector and center imaging amplifier C225; and between the silent radio speaker connector and ground as follows:

Speaker Speaker Connector Center Imaging Amplifier C225 Pin Circuit

LH C230 7 8-MD30 (WH/BU)

LH C230 8 10-MD30 (GY/VT)

RH C231 5 8-MD31 (WH/GN)

RH C231 6 10-MD31 (GY/OG)

� Are the resistance(s) less than 5 ohms between the radio speaker connector(s) and the ACM, and

greater than 10,000 ohms between the radio speaker connector(s) and ground?

Yes GO to I3.


I3 SUBSTITUTE SPEAKER

Substitute a known good radio speaker for each silent radio speaker.

Turn on the ACM.

� Are the known good radio speaker(s) silent?

Yes REMOVE the center imaging amplifier and SEND it to an authorized Ford audio system repair facility. TEST the system for normal operation.

No INSTALL a new radio speaker(s) in question. TEST the system for normal operation.

I4 CHECK CENTER IMAGING AMPLIFIER ENABLE CIRCUIT FOR POWER

Center Imaging Amplifier C225



Turn on the ACM.

Measure the voltage between center imaging amplifier C225 pin 13, circuit 7-MD12 (YE), harness side and ground.

� Is voltage present?

Yes GO to I5.

No GO to I9.

I5 CHECK POWER TO THE CENTER IMAGING AMPLIFIER

Measure the voltage between center imaging amplifier C225 pin 16, circuit 29-MD12 (OG/YE), harness side and ground.


Yes GO to I6.


I6 CHECK GROUND TO THE CENTER IMAGING AMPLIFIER

Measure the resistance between center imaging amplifier C225 pin 15, circuit 31-MD12 (BK), harness side and ground.


Yes GO to I7.


I7 CHECK THE CIRCUITS BETWEEN THE ACM AND THE CENTER IMAGING AMPLIFIER

ACM C240b

Measure the resistance between ACM C240b and center imaging amplifier C225; and between ACM C240b and ground as follows:



PINPOINT TEST J: NO SOUND FROM ALL SPEAKERS

ACM 240b Pin Center Imaging Amplifier C225 Pin Circuit

5 2 2-MD12 (GY)

6 1 1-MD12 (WH)

� Are the resistance(s) less than 5 ohms between the ACM and the center imaging amplifier, and greater

than 10,000 ohms between the ACM and ground?

Yes GO to I8.


I8 CHECK THE ACM

Substitute the ACM with a known good component.

� Do the center imaging speakers operate?


No REMOVE the center imaging amplifier and SEND it to an authorized Ford audio system repair facility. TEST the system for normal operation.

I9 CHECK THE ENABLE CIRCUIT TO THE CENTER IMAGING AMPLIFIER

Measure the resistance between center imaging amplifier C225 pin 13, circuit 7-MD12 (YE), harness side and ACM C240b pin 8, circuit 7-MD12 (YE), harness side; and between center imaging amplifier C225 pin 13, circuit 7-MD12 (YE), harness side and ground.

� Is the resistance less than 5 ohms between the center imaging amplifier and the ACM and greater than

10,000 ohms between the center imaging amplifier and ground?




J1 CHECK FOR ACM POWER

Turn on the ACM.

� Does the display on the ACM illuminate?

Yes GO to J2.

No GO to Pinpoint Test B.

J2 CHECK FOR SOUND




No GO to Pinpoint Test H.



PINPOINT TEST K: LOUD POPS WHEN CYCLING THE IGNITION SWITCH

PINPOINT TEST L: THE SUBWOOFER IS INOPERATIVE


K1 CHECK CIRCUIT 7-MD19 (WH/RD) AND 8-MD19 (WH/RD) FOR POWER

ACM C240b

Subwoofer Amplifier C466

Measure the voltage between the subwoofer amplifier C466 pin 1, circuit 8-MD19 (WH/RD), harness side and ground.


Yes REPAIR the circuit. TEST the system for normal operation.



L1 CHECK THE SUBWOOFER OPERATION

Turn the ACM on.

Check the operation of the subwoofer speakers.

� Are both subwoofer speakers inoperative?

Yes GO to L2.

No GO to L7.

L2 CHECK CIRCUIT 7-MD19 (YE/RD) FOR POWER

Subwoofer Amplifier C466

Measure the voltage between subwoofer amplifier C466 pin 1, circuit 7-MD19 (YE/RD), harness side and ground.




Yes GO to L3.

No GO to L8.

L3 CHECK CIRCUIT 30-MD19 (RD) FOR VOLTAGE

Measure the voltage between subwoofer amplifier C466 pin 5, circuit 30-MD19 (RD), harness side and ground.


Yes GO to L4.


L4 CHECK GROUND CIRCUIT 31-MD19 (BK)

Measure the resistance between subwoofer amplifier C466 pin 2, circuit 31-MD19 (BK), harness side and ground.


Yes GO to L5.


L5 CHECK CIRCUIT 1-MD19 (WH/RD)

ACM C240b

Measure the resistance between subwoofer amplifier C466 pin 7, circuit 1-MD19 (WH/RD), and ACM C240b pin 2, circuit 1-MD19 (WH/RD); and between subwoofer amplifier C466 pin 7, circuit 1-MD19 (WH/RD), harness side and ground.



� Is the resistance less than 5 ohms between the subwoofer amplifier and the ACM, and greater than

10,000 ohms between the subwoofer amplifier and ground?

Yes GO to L6.


L6 CHECK CIRCUIT 2-MD19 (GY/RD)

Measure the resistance between subwoofer amplifier C466 pin 8, circuit 2-MD19 (GY/RD), harness side and ACM C240b pin 1, circuit 2-MD19 (GY/RD), harness side; and between subwoofer amplifier C466 pin 8, circuit 2-MD19 (GY/RD), harness side and ground.

� Is the resistance less than 5 ohms between the subwoofer amplifier and the ACM, and greater than

10,000 ohms between the subwoofer amplifier and ground?

Yes REMOVE the subwoofer amplifier and SEND it to an authorized Ford audio system repair facility. TEST the system for normal operation.


L7 CHECK SUBWOOFER SPEAKER

Substitute the inoperative subwoofer speaker with a known good subwoofer speaker.

Check the operation of the subwoofer speakers.

� Does the known good subwoofer speaker operate correctly?

Yes INSTALL a new subwoofer speaker; REFER to Section 415-03. TEST the system for normal operation.

No REPAIR the circuit between the subwoofer amplifier and the inoperative subwoofer speaker. TEST the system for normal operation.

L8 CHECK CIRCUIT 7-MD19 (YE/RD) FOR OPEN

ACM C240b

Measure the resistance between subwoofer amplifier C466 pin 1, circuit 7-MD19 (YE/RD), harness side and ACM C240b pin 4, circuit 7-MD19 (YE/RD), harness side.



PINPOINT TEST M: THE AUXILIARY AUDIO CONTROL IS INOPERATIVE/DOES NOT OPERATE CORRECTLY — STEERING WHEEL CONTROL SWITCHES


Yes REMOVE the subwoofer amplifier and SEND it to an authorized Ford audio system repair facility. TEST the system for normal operation.



M1 CHECK THE STEERING WHEEL CONTROL SWITCH RESISTANCES

ACM C240a

Measure the resistance between ACM C240a pin 14, circuit 8-MD26 (WH/BK), harness side and ground while depressing the steering wheel control switches as follows:

Switch Resistance range

VOL Down 53.1-54.1 ohms

VOL Up 145.3-148.1 ohms

SEEK Up 297.7-303.7 ohms

SEEK Down 556.1-567.3 ohms

MEDIA 1026.4-1047.0 ohms

Phone/Mute 2016.4-2057.0 ohms

None greater than 10,000 ohms

� Are the resistances within specification?


No GO to M2.

M2 CHECK CIRCUIT 8-MD26 (WH/BK)

Air Bag Sliding Contact C218a

Measure the resistance between ACM C240a pin 14, circuit 8-MD26 (WH/BK), harness side and air bag sliding contact C218a pin 1, circuit 8-MD26 (WH/BK), harness side; and between ACM C240a pin 14, circuit 8-MD26 (WH/BK), harness side and ground.



� Is the resistance less than 5 ohms between the ACM and the air bag sliding contact, and greater than

10,000 ohms between the ACM and ground?

Yes GO to M3.


M3 CHECK CIRCUIT 31S-PG24 (BK/OG)

PCM 175a

Measure the resistance between air bag sliding contact C218a pin 8, circuit 31S-PG24 (BK/OG), harness side and PCM C175a pin 56, circuit 31S-PG24 (BK/OG), harness side; and between air bag sliding contact C218a pin 8, circuit 31S-PG24 (BK/OG), harness side and ground.


Yes GO to M4.


M4 CHECK THE AIR BAG SLIDING CONTACT

Air Bag Sliding Contact C217

Measure the resistance between air bag sliding contact C218a pin 1, component side and horn switch C217 pin 6, component side; and between air bag sliding contact C218a pin 8, component side and horn switch C217 pin 3, component side.


Yes GO to M5.

No INSTALL a new air bag sliding contact; REFER to Section 501-20B. TEST the system for normal operation.

M5 CHECK THE HORN SWITCH

Measure the resistance between horn switch C217 pin 6, component side and steering wheel control switch C208 pin 3, component side; and between horn switch C217 pin 3, component side and steering wheel control switch C208 pin 2, component side.


Yes INSTALL new steering wheel control switches. TEST the system for normal operation.

No



INSTALL a new horn switch; REFER to Section 413-06. TEST the system for normal operation.



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