1996 Bronco/F-Series

Section 15-00: Audio Systems, Service

1996 F-150, F-250, F-350, F-Super Duty and Bronco Workshop Manual

DIAGNOSIS AND TESTING

Pinpoint Tests — Sound System Function

PINPOINT TEST A: RADIO CHASSIS INOPERATIVE/DOES NOT OPERATE PROPERLY

A1 CHECK OPERATION OF RADIO CHASSIS

Key to RUN or ACCESSORY.
Press radio POWER on.

Is radio chassis display lit?

Yes	No
GO to A3.	GO to A2.

A2 CHECK QUALITY SOUND FROM RADIO SPEAKERS

Verify that quality sound is coming from radio speakers.

Is quality sound coming from radio speakers?

Yes	No
GO to Pinpoint Test B.	GO to A16.

A3 DISPLAY TEST — AM BAND INDICATOR

Press AM/FM button for AM band.
Press TUNE button to station 1000 AM.

Is display correct and is AM indicator lit?

Yes	No
GO to A4.	REMOVE radio chassis for service.

A4 DISPLAY TEST — FM1/FM2 BAND INDICATORS

Press AM/FM button FM1 band.
Press TUNE button to station 88.9 FM.
Verify for FM2 band.

Is display correct and are FM1 and FM2 indicators lighting respectively?

Yes	No
GO to A5.	REMOVE radio chassis for service.

A5 DISPLAY TEST — ST STEREO INDICATOR

Press SEEK or TUNE buttons to a local FM stereo station.

Is display correct and is ST indicator lit?

Yes	No
GO to A6.	REMOVE radio chassis for service.

A6 SEEK — HIGHER FREQUENCY STATION

Press SEEK (>) and verify that number on display increases.

NOTE: If display reads 1610 AM or 107.9 FM, display will not increase. The SEEK (>) button should be pressed until display reads less than 1610 AM or 107.9 FM.

Is SEEK (>) operating properly?

Yes	No
GO to A7.	REMOVE radio chassis for service.

A7 SEEK — LOWER FREQUENCY STATION

Press SEEK (<) and verify that number on display decreases.

NOTE: If display reads 530 AM or 88.1 FM, display will not decrease. The SEEK (<) button should be pressed until display reads greater than 530 AM or 88.1 FM.

Is SEEK (<) operating properly?

Yes	No
GO to A8.	REMOVE radio chassis for service.

A8 STATION RECALL MEMORY TEST

Press SEEK or TUNE buttons to a desired station.
Press and hold one of the (1 through 5) memory buttons for two seconds until station sound is returned (repeat for all five buttons).
Do for AM, FM1 and FM2 bands using 15 stations.
Turn radio chassis off, then on.
Press each station recall button and verify memory storage.

Is memory test successful?

Yes	No
GO to A9.	REMOVE radio chassis for service.

A9 VOLUME CONTROL TEST

Press VOLUME (+) and (-) to verify an increase and decrease in volume sound from radio chassis.

Does volume change properly?

Yes	No
GO to A10.	CHECK radio speakers and connections. REFER to Symptom Chart if diagnosis finds radio speakers inoperative. REPEAT volume test. If volume still inoperative, REMOVE radio chassis for service.

A10 TUNE CONTROL TEST (ESR)

Press TUNE button (>) or (<) to change the frequency station up or down one increment at a time. Change frequencies quickly by holding the (>) or (<) side of button. Verify for all bands.

Does TUNE operate properly?

Yes	No
GO to A11.	REMOVE radio chassis for service.

A11 TUNE ANTENNA TEST (OPTIONAL)

Tune radio on AM band outside of building.
Press SEEK to observe all listenable stations on band. Count number that can be tuned.
Compare to a vehicle with known good radio chassis.

Are normal number of stations received?

Yes	No
GO to A12.	If an absolute number of stations cannot be tuned, PERFORM radio antenna component test. REFER to Components Tests in this section. If antenna operative, REMOVE radio chassis for service.

A12 CLOCK — CONTROL TEST

Press CLOCK button and simultaneously press SEEK (>) to advance hours or SEEK (<) to advance minutes. Release CLOCK button.

Does CLOCK operate properly?

Yes	No
GO to A13.	REMOVE radio chassis for service.

A13 TONE CONTROL TEST

BASS: Press AUDIO button repeatedly until BASS is displayed. Press VOLUME (+) to increase low frequency sounds and VOLUME (-) to decrease low frequency sounds.
TREBLE: Press AUDIO button repeatedly until TREB is displayed. Press VOLUME (+) to increase high frequency sounds and VOLUME (-) to decrease high frequency sounds.
Verify proper display and sounds for each tone control.

Do BASS and TREBLE operate properly?

Yes	No
GO to A14.	CHECK radio speakers and connections. REFER to Symptom Chart if diagnosis finds radio speakers inoperative. If BASS and/or TREBLE still inoperative, REMOVE radio chassis for service.

A14 BALANCE CONTROL TEST

BALANCE: Press AUDIO button repeatedly until BAL is displayed. Press VOLUME (+) to shift sound to right radio speakers and VOLUME (-) to shift sound to left radio speakers.
Verify proper display and sound in proper radio speakers.

Does BALANCE operate properly?

Yes	No
GO to A15.	CHECK radio speakers and connections. REFER to Symptom Chart if diagnosis finds radio speakers inoperative. If BALANCE still inoperative, REMOVE radio chassis for service.

A15 FADER CONTROL TEST

FADER: Press AUDIO button repeatedly until FADE is displayed. Press VOLUME (+) to shift sound to rear radio speakers and VOLUME (-) to shift sound to front radio speakers.

Does FADER operate properly?

Yes	No
REFER to symptom chart to determine if an inoperative condition exists.	CHECK radio speakers and connections. REFER to Symptom Chart if diagnosis finds radio speakers inoperative. If FADER still inoperative, REMOVE radio chassis for service.

A16 CHECK INOPERATIVE OR INTERMITTENT

Verify if condition is intermittent or inoperative.

Is condition intermittent?

Yes	No
GO to A19.	GO to A17.

A17 CHECK FUSE

Key off.
Check fuse 11 (15A) in instrument panel fuse panel.
Check fuse 17 (50A) in power distribution box.

Are fuses open?

Yes	No
REMOVE open fuse and GO to A18.	GO to A19.

A18 CHECK FOR GROUNDED POWER FEED

Key off, check Circuit 137 (Y/BK) at radio chassis connector C1 for a short to ground.

Is power feed grounded?

Yes	No
LOCATE short to ground and REPLACE or SERVICE. REPLACE fuse(s). RETEST system.	REPLACE fuse and RETEST system. If fuse still opens, REMOVE radio chassis for service.

A19 CHECK POWER FEED

Connect digital volt-ohmmeter between radio chassis connector C1 Circuit 137 (Y/BK) and known good ground.
Key to RUN or ACCESSORY.

Does digital volt-ohmmeter indicate 10 volts or more?

Yes	No
GO to A23.	GO to A20.

A20 CHECK WIRING CONTINUITY — FUSE TO RADIO

Remove fuse 17 (50A) temporarily.
Check continuity between fuse 17 output cavity and radio chassis connector C1 Circuit 137 (Y/BK).

Is continuity present?

Yes	No
GO to A21.	SERVICE wiring as required. RETEST system.

A21 CHECK WIRING CONTINUITY — FUSE TO IGNITION SWITCH

Check continuity between fuse 11 (15A) input cavity and ignition switch Circuit 297 (BK/LG).

Is continuity present?

Yes	No
RECONNECT fuse and GO to A22.	SERVICE wiring as required. RETEST system.

A22 CHECK IGNITION SWITCH POWER

Connect digital volt-ohmmeter between ignition switch connector Circuit 297 (BK/LG).
Key to RUN or ACCESSORY.

Does digital volt-ohmmeter indicate 10 volts or more?

Yes	No
REMOVE radio chassis for service.	SERVICE ignition switch, fuse P (50A), or Circuit 37 (Y) for open. REFER to Section 14-00.

A23 CHECK RADIO SPEAKERS

With radio chassis operating, check if condition is on all radio speakers.

Is condition present on all radio speakers?

Yes	No
GO to A24.	GO to A25.

A24 CHECK RADIO ANTENNA

Check radio antenna, cable connections and wiring.

Is antenna system operating properly?

Yes	No
GO to A25.	CONNECT, SERVICE or REPLACE antenna components as required. RETEST system.

A25 CHECK RADIO CHASSIS

Substitute known good radio speakers to radio chassis.
Verify if condition is in radio speaker or radio chassis operation.

Is radio chassis operating?

Yes	No
CONNECT, SERVICE or REPLACE radio speakers and wiring as required. RETEST system.	REMOVE radio chassis for service.

PINPOINT TEST B: RADIO CHASSIS DISPLAY BLANK — RADIO CHASSIS OPERATES

B1 CHECK OPERATION OF RADIO CHASSIS

Key to RUN or ACCESSORY.
Press radio POWER on.

Isradio chassis display lit?

Yes	No
GO to A1.	GO to B2.

B2 CHECK QUALITY SOUND FROM RADIO SPEAKERS

Verify that quality sound is coming from radio speakers.

Is quality sound coming from radio speakers?

Yes	No
DISCONNECT fuse 11 (15A) and GO to B3.	GO to A1.

B3 CHECK WIRING CONNECTIONS

Check wiring connectors and wires for damage, corrosion or open wire at radio chassis connector C1 Pin 6, Circuit 137 (Y/BK).

Are wires and connections OK?

Yes	No
RECONNECT fuse and GO to B4.	SERVICE harness, connector and wiring as required. RETEST system.

B4 CHECK LCD SUPPLY

Connect digital volt-ohmmeter between radio chassis connector C1 Circuit 484 (O/BK) and known good ground.
Key to RUN or ACCESSORY.
Measure voltage at Circuit 484 (O/BK).

Does digital volt-ohmmeter indicate 10 volts or more?

Yes	No
REMOVEradio chassis for service. LCD display is internally inoperative.	GO to B5.

B5 CHECK FUSE

Key off.
Check fuse 10 (4A) in instrument panel fuse panel.

Is fuse open?

Yes	No
GO to B6.	GO to B7.

B6 CHECK FOR GROUNDED ILLUMINATION FEED

Turn radio chassis off.
Disconnect radio chassis connector C1.
Check Circuit 19 (LB/R) for continuity to known good ground.
Check Circuit 294 (W/LB) for continuity to known good ground.

Is continuity present?

Yes	No
LOCATE short to ground and SERVICE. REPLACE fuse. RETEST system.	REPLACE fuse. OPERATE. If fuse still opens, REMOVE radio chassis for service.

B7 CHECK WIRING — FUSE 4 (15A)

Check continuity between fuse 4 (15A) output cavity and IP fuse 10 (4A) input cavity Circuit 294 (W/LB).
Check Circuit 19 (LB/R) for continuity from fuse 10 (4A) output cavity to Pin 5 of radio chassis connector C1.

Is continuity present?

Yes	No
REFER to Section 14-00 for ignition switch or battery operation and circuit diagnosis.	REPLACE or SERVICE wiring as required. RETEST system.

PINPOINT TEST C: RADIO CHASSIS/TAPE PLAYER INOPERATIVE/DOES NOT OPERATE PROPERLY

C1 CHECK OPERATION OF RADIO CHASSIS

Key to RUN or ACCESSORY.
Press radio POWER on.

Is radio chassis display lit?

Yes	No
GO to C3.	GO to C2.

C2 CHECK QUALITY SOUND FROM RADIO SPEAKERS

Verify that quality sound is coming from radio speakers.

Is quality sound coming from radio speakers?

Yes	No
GO to D1.	GO to C28.

C3 DISPLAY TEST — AM BAND INDICATOR

Press AM/FM button for AM band.
Press TUNE, SCAN or SCAN/TUNE button to station 1000 AM.

Is display correct and is AM indicator lit?

Yes	No
GO to C4.	REMOVE radio chassis for service.

C4 DISPLAY TEST — FM1/FM2 BAND INDICATORS

Press AM/FM button FM1 band.
Press SCAN or SCAN/TUNE button to station 88.9 FM.
Verify for FM2 band.

Is display correct and are FM1 and FM2 indicators lighting respectively?

Yes	No
GO to C5.	REMOVE radio chassis for service.

C5 DISPLAY TEST — ST STEREO INDICATOR

Press SCAN, SEEK or SCAN/TUNE buttons to a local FM stereo station.

Is display correct and is ST indicator lit?

Yes	No
GO to C6.	REMOVE radio chassis for service.

C6 SEEK — HIGHER FREQUENCY STATION

Press SEEK (>) and verify that number on display increases.

NOTE: If display reads 1710 AM or 107.9 FM, display will not increase. The SEEK (>) button should be pressed until display reads less than 1710 AM or 107.9 FM.

Is SEEK (>) operating properly?

Yes	No
GO to C7.	REMOVE radio chassis for service.

C7 SEEK — LOWER FREQUENCY STATION

Press SEEK (<) and verify that number on display decreases.

NOTE: If display reads 530 AM or 87.7 FM, display will not decrease. The SEEK (<) button should be pressed until display reads greater than 530 AM or 87.7 FM.

Is SEEK (<) operating properly?

Yes	No
GO to C8.	REMOVE radio chassis for service.

C8 STATION RECALL MEMORY TEST

Press SCAN, SEEK or SCAN/TUNE buttons to a desired station.
Press and hold one of the memory buttons for two seconds until station sound is returned (repeat for all memory buttons).
Do for AM, FM1 and FM2 bands.
Turn radio chassis off, then on.
Press each station recall button and verify memory storage.

Is memory test successful?

Yes	No
GO to C9.	REMOVE radio chassis for service.

C9 VOLUME CONTROL TEST

Press VOLUME (+) and (-) to verify an increase and decrease in volume sound from radio chassis.

Does volume change properly?

Yes	No
GO to C10.	CHECK radio speakers and connections. REFER to Symptom Chart if diagnosis finds radio speakers inoperative. REPEAT volume test. If volume still inoperative, REMOVE radio chassis for service.

C10 SCAN MODE TEST (ESC OR CDR)

Press SCAN. (Go to CDR or ESC equipped).
(CDR) Display will blink SCN.
Press (>) side of SEEK button to begin forward scan mode up to next radio station for a five-second sampling. Verify several stations.
Press (<) side of SEEK button to begin reverse scan mode. Verify several stations.
Stop scan mode by pressing SCAN, or press the side of SEEK button presently matching direction of scanning.
Press SCAN button twice to change radio stations up or down one increment of frequency at a time. (Display will read "TUNE"), then, within five seconds, press (>) or (<) side of SEEK button.

NOTE: Change stations quickly by pressing and holding SEEK (>) or (<).

(ESC) Scan mode will begin to scan up to next radio selection for a five-second sampling.
Stop scan mode by pressing SCAN button.

Does (ESC/CDR) scan mode operate properly?

Yes	No
GO to C11.	REMOVE radio chassis for service.

C11 TUNE ANTENNA TEST (OPTIONAL)

Tune radio on AM band outside of building.
Press SEEK to observe all listenable stations on band. Count number that can be tuned.
Compare to a vehicle with known good radio chassis.

Are normal number of stations received?

Yes	No
GO to C12.	If an absolute number of stations cannot be tuned, PERFORM an Antenna System Check. If antenna operative, REMOVE radio chassis for service.

C12 SEEK — AUTOMATIC MUSIC SEARCH TEST

Press SEEK button to change frequency up or down one increment at a time. Press SEEK (>) or (<) and release to go in the direction desired. To change frequencies quickly, press SEEK (>) or (<) and hold.

Does SEEK function operate properly?

Yes	No
GO to C13.	REMOVE radio chassis for service.

C13 CLOCK — CONTROL TEST

Press CLOCK button and simultaneously press SEEK (<) to advance hours or SEEK (>) to advance minutes. Release CLOCK button.

Does CLOCK operate properly?

Yes	No
GO to C14 if AUTO PRESET button equipped, otherwise GO to C15.	REMOVE radio chassis for service.

C14 AUTO PRESET — AUTOMATIC MEMORY STORE (CDR)

Press AUTO PRESET button for three seconds.
Verify that radio chassis automatically presets strong stations sequentially on all memory recall buttons.
Turn off radio chassis, then turn back on.
Verify the same stations are in memory for all buttons.

Does AUTO PRESET operate properly?

Yes	No
GO to C15.	REMOVE radio chassis for service.

C15 TONE CONTROL TEST

BASS: Press AUDIO button repeatedly until BASS is displayed. Press VOLUME (+) to increase low frequency sounds and VOLUME (-) to decrease low frequency sounds.
TREBLE: Press AUDIO button repeatedly until TREB is displayed. Press VOLUME (+) to increase high frequency sounds and VOLUME (-) to decrease high frequency sounds.
Verify proper display and sounds for each tone control.

Do BASS and TREBLE operate properly?

Yes	No
GO to C16.	CHECK radio speakers and connections. REFER to Symptom Chart if diagnosis finds radio speakers inoperative. If BASS and/or TREBLE still inoperative, REMOVE radio chassis for service.

C16 BALANCE CONTROL TEST

BALANCE: Press AUDIO button repeatedly until BAL is displayed. Press VOLUME (+) to shift sound to right radio speakers and VOLUME (-) to shift sound to left radio speakers.
Verify proper display and sound in proper radio speakers.

Does BALANCE operate properly?

Yes	No
GO to C17.	CHECK radio speakers and connections. REFER to Symptom Chart if diagnosis finds radio speakers inoperative. If BALANCE still inoperative, REMOVE radio chassis for service.

C17 FADER CONTROL TEST

FADER: Press AUDIO button repeatedly until FADE is displayed. Press VOLUME (+) to shift sound to rear radio speakers and VOLUME (-) to shift sound to front radio speakers.
Verify proper display and sound in proper radio speakers.

Does FADER operate properly?

Yes	No
GO to C18.	CHECK radio speakers and connections. REFER to Symptom Chart if diagnosis finds radio speakers inoperative. If FADER still inoperative, REMOVE radio chassis for service.

C18 TAPE PLAYER — LOADING TEST

With radio chassis POWER on and key to RUN or ACCESSORY, insert known good cassette into tape player opening (with open edge of tape to the right).

NOTE: If tape is at the end, playing will start on reverse side of tape.

Display will indicate arrows for ESC.

Do loading of tape and display operate properly?

Yes	No
GO to C19.	REMOVE radio chassis with tape player for service.

C19 TAPE PLAYER — REV/FF TEST (ESC)

Press the left side of REV/FF button to rewind tape playing forward. Return to tape play by pressing right side of button.
Press the right side of REV/FF button to fast-forward tape playing forward. Return to play by pressing left side of button.
Pressing both sides of REV/FF button simultaneously will reverse tape to opposite side (track) of tape.

Do REV/FF operate properly?

Yes	No
GO to C20.	REMOVE radio chassis with tape player for service.

C20 TAPE PLAYER — DOLBY TEST

(ESC) Press memory button (3) to select Dolby® Noise Reduction. Verify quality of sound.
Eject tape and verify Dolby® for Dynamic Noise Reduction on an FM stereo station. Verify sound.

Does DOLBY operate properly?

Yes	No
GO to C21.	REMOVE radio chassis with tape player for service.

C21 TAPE PLAYER — EJECT TEST (ESC)

Press EJECT or EJCT button to eject tape from opening. Radio chassis will resume playing if power on.

NOTE: Tapes can be ejected with or without power on or ignition switch power.

Does EJECT operate properly?

Yes	No
GO to C22.	REMOVE radio chassis with tape player for service.

C22 TAPE PLAYER — RADIO SPEAKER CONTROL TEST

Adjust AUDIO button for BASS, TREBLE, BALANCE and FADER respectively, operating the VOLUME (+) and (-) for all conditions.
Adjust VOLUME in both conditions to verify loudness.

Do all radio speaker controls operate properly?

Yes	No
REFER to Symptom Chart to determine if an inoperative condition exists.	CHECK radio speakers and connections. REFER to Symptom Chart if diagnosis finds radio speakers inoperative. If radio speaker controls inoperative in radio chassis, GO to C23.

C23 CHECK INOPERATIVE OR INTERMITTENT

Verify if condition is intermittent or inoperative.

Is condition intermittent?

Yes	No
GO to C26.	GO to C24.

C24 CHECK FUSE

Key off.
Check fuse 11 (15A) in instrument panel fuse panel.
Check fuse 17 (50A) in power distribution box.

Is either fuse open?

Yes	No
REMOVE open fuse(s) and GO to C25.	GO to C27.

C25 CHECK FOR GROUNDED POWER FEED

With key off, check fuse 11 (15A), Circuit 137(Y/BK) at radio chassis connector C1 for a short to ground.
Check fuse 17 (50A), Circuit 37 (Y).

Is power feed grounded?

Yes	No
LOCATE short to ground and REPLACE or SERVICE. REPLACE fuse(s). RETEST system.	REPLACE fuse and RETEST system. If fuse still opens, REMOVE radio chassis for service.

C26 CHECK POWER FEED

Connect digital volt-ohmmeter between radio chassis connector C1, Pin 6 Circuit 137 (Y/BK) and a known good ground.
Key to RUN or ACCESSORY.

Does digital volt-ohmmeter indicate 10 volts or more?

Yes	No
GO to C30.	GO to C27.

C27 CHECK WIRING CONTINUITY — FUSE 17 (50A)

Remove fuse 17 (50A) temporarily.
Check continuity between fuse 17 (50A) and radio chassis connector C1, Pin 6 Circuit 137 (Y/BK).

Is continuity present?

Yes	No
GO to C28.	SERVICE wiring or ignition switch for open. RETEST system.

C28 CHECK RADIO SPEAKERS

With radio chassis operating, check if condition is on all radio speakers.

Is condition present on all radio speakers?

Yes	No
GO to C27.	GO to C29.

C29 CHECK RADIO ANTENNA

Check antenna, radio antenna lead in cable and wiring.

Is antenna system operating properly?

Yes	No
GO to C30.	CONNECT, SERVICE or REPLACE antenna components as required. RETEST system.

C30 CHECK RADIO CHASSIS

Substitute known good radio speaker to radio chassis.
Verify if condition is in radio speakers or radio chassis operation.

Is radio chassis operating?

Yes	No
CONNECT, SERVICE or REPLACE radio speakers and wiring as required. RETEST system.	REMOVE radio chassis for service.

PINPOINT TEST D: RADIO CHASSIS/TAPE PLAYER DISPLAY BLANK — RADIO CHASSIS/TAPE PLAYER OPERATES

D1 CHECK OPERATION OF RADIO CHASSIS

Key to RUN or ACCESSORY.
Press radio POWER on.

Is radio chassis display lit?

Yes	No
GO to C1.	GO to D2.

D2 CHECK QUALITY SOUND FROM RADIO SPEAKERS

Verify that quality sound is coming from radio speakers.

Is quality sound coming from radio speakers?

Yes	No
DISCONNECT fuse 11 (15A) and GO to D3.	GO to C1.

D3 CHECK WIRING CONNECTIONS

Check wiring connectors and wires for damage, corrosion or open wire at radio chassis connector C1 Circuit 137 (Y/BK) or Circuit 484 (O/BK) and Circuit 19 (LB/R).

Are wires and connections OK?

Yes	No
RECONNECT fuse 11 (15A) and GO to D4.	SERVICE harness, connector and wiring as required. RETEST system.

D4 CHECK LCD SUPPLY

Connect digital volt-ohmmeter between radio chassis connector C1 Circuit 484 (O/BK), Pin 4 and known good ground.
Key to RUN or ACCESSORY.
Measure voltage from Circuit 484 (O/BK) and ground.

Does digital volt-ohmmeter indicate 10 volts or more?

Yes	No
REMOVEradio chassis for service. LCD display is internally inoperative.	GO to D5.

D5 CHECK FUSE

Key off.
Check fuse 11 (15A) in instrument panel fuse panel. Check fuse 17 (50A) in power distribution box.

Is either fuse open?

Yes	No
GO to D6.	GO to D7.

D6 CHECK FOR GROUNDED LCD FEED

Turn radio chassis off.
Check fuse 11 (15A) Circuit 137 (Y/BK) for continuity to known good ground.
Check Circuit 484 (O/BK) for continuity to known good ground.
Check Circuit 297 (BK/LG) at ignition switch for continuity to known good ground.
Check Circuit 37 (Y) between IP fuse panel and power distribution box for continuity to known good ground.

Is continuity present?

Yes	No
SERVICE Circuit 137 (Y/BK), Circuit 484 (O/BK), Circuit 297 (BK/LG), Circuit 37 (Y), headlamp switch, or ignition switch for short to ground. REPLACE fuse. RETEST system.	REPLACE fuse. OPERATE. If fuse still opens, REMOVE radio chassis for service.

D7 CHECK WIRING — FUSE 17 (50A)

Check continuity between fuse 17 (50A) and radio chassis connector C1 Circuit 484 (O/BK).

Is continuity present?

Yes	No
REFER to Section 14-00 for ignition switch or battery operation and circuit diagnosis.	REPLACE or SERVICE wiring, headlamp switch or ignition switch as required. RETEST system.

PINPOINT TEST E: COMPACT DISC RADIO INOPERATIVE/DOES NOT OPERATE PROPERLY

E1 CHECK OPERATION OF COMPACT DISC RADIO

Key to RUN or ACCESSORY.
Press radio POWER on.
Verify radio chassis operates properly. (Refer to Pinpoint Test C.)
Handling test disc by its edge (label-side up), insert into compact disc radio. Verify powerloading.

Is compact disc radio display lit?

Yes	No
GO to E3.	GO to E2.

E2 CHECK QUALITY SOUND FROM RADIO SPEAKERS

Verify that quality sound is coming from radio speakers.

Is quality sound coming from radio speakers?

Yes	No
GO to Pinpoint Test F.	GO to E9.

E3 COMPACT DISC RADIO — PLAY/STOP TEST

STOP: Press PLAY/STOP button and verify disc stops playing, stop indicator illuminates and operation returns to radio or tape mode.
PLAY: Press PLAY/STOP button and verify disc resumes playing at point of stop, play indicator illuminates, track number illuminates and elapsed time illuminates.

Do PLAY and STOP operate properly?

Yes	No
GO to E4.	REMOVE compact disc radio for service.

E4 COMPACT DISC RADIO — REVERSE/FAST — FORWARD TEST

Press FF to fast-forward disc to a particular point.
Press FF to reverse disc to a particular point.

NOTE: Observe elapsed time to indicate where to stop.

Do REVERSE and FAST FORWARD operate properly?

Yes	No
GO to E5.	REMOVE compact disc radio for service.

E5 COMPACT DISC RADIO — SCAN MODE TEST

Press SCAN button to activate scan mode.
Verify that disc scans to next selection and plays a five second sample then advances to next until SCAN button is pressed again.
Verify display indicates track number and elapsed time.

Does SCAN operate properly?

Yes	No
GO to E6.	REMOVE compact disc radio for service.

E6 COMPACT DISC RADIO — CDR SEEK CONTROL TEST

Press SEEK (>>) to search for a later selection.
Press SEEK (<<) to search for a previous selection.
Verify during play and stop modes.

Does SEEK control operate properly?

Yes	No
GO to E7.	REMOVE compact disc radio for service.

E7 COMPACT DISC RADIO — COMPRESS TEST

Press COMPRESS to bring the softer and louder passages together.
Verify display indicates "COMP."

Does COMPRESS operate properly?

Yes	No
GO to E8.	REMOVE compact disc radio for service.

E8 COMPACT DISC RADIO — EJECT TEST

Press EJECT button to eject disc and stop unit.
Verify display turns off and radio program or tape resumes playing.

Does EJECT operate properly?

Yes	No
GO to E9.	REMOVE compact disc radio for service.

E9 COMPACT DISC RADIO — RADIO SPEAKER CONTROL TEST

With disc inserted, press AUDIO button on radio chassis for BASS, TREBLE, BALANCE, and FADER operating the VOLUME (+) and (-) for all conditions.
Perform just VOLUME in both conditions to verify sound loudness.

Do all radio speaker controls operate properly?

Yes	No
REFER to Symptom Chart to determine if an inoperative condition exists. PERFORM tests as directed.	REMOVE compact disc radio for service.

PINPOINT TEST F: COMPACT DISC RADIO DISPLAY BLANK/RADIO CHASSIS/DIGITAL AUDIO COMPACT DISC PLAYER OPERATES

F1 CHECK OPERATION OF COMPACT DISC RADIO

Key to RUN or ACCESSORY.
Press radio chassis POWER on.
Verify radio chassis operates properly. (Refer to Pinpoint Test C.)
Handling test disc by its edge (label-side up), insert into compact disc radio. Verify powerloading.

Is compact disc radio display lit?

Yes	No
GO to E1.	GO to F2.

F2 CHECK QUALITY SOUND FROM RADIO SPEAKERS

Verify that quality sound is coming from radio speakers.

Is quality sound coming from radio speakers?

Yes	No
GO to F3.	GO to Pinpoint Test E.

F3 CHECK WIRING CONNECTIONS

Check wiring connectors and wires for damage, corrosion or open wire at compact disc radio connectors.

Are wires and connections OK?

Yes	No
GO to F4.	SERVICE harness, connector and wiring as required. RETEST system.

F4 CHECK MEMORY SUPPLY

Connect digital volt-ohmmeter between compact disc radio connector C1 Circuit 797 (LG/P) and known good ground.

Does digital volt-ohmmeter indicate 10 volts or more?

Yes	No
REMOVE compact disc radio for service. LCD display is internally inoperative.	GO to F5.

F5 CHECK RADIO CHASSIS DISPLAY

Verify that radio chassis display is lit with power on.

Is radio chassis display lit?

Yes	No
GO to F6.	GO to D1.

F6 CHECK WIRING — MEMORY FUSE 1 (20A)

Check continuity between memory fuse 1 (20A) in power distribution box and compact disc radio chassis connector C1 Pin 8, Circuit 797 (LG/P).

Is continuity present?

Yes	No
REMOVE compact disc radio for service.	SERVICE wiring as required. RETEST system.

PINPOINT TEST G: TAPE PLAYER ONLY INOPERATIVE/DOES NOT OPERATE PROPERLY

G1 TAPE PLAYER LOADING TEST (ESC)

With radio chassis POWER on and key to RUN or ACCESSORY, insert known good cassette into tape player opening (with open edge of tape to the right). Verify automatic powerloading (tape player draws tape in and begins playing tape).

NOTE: If tape is at the end, playing will start on reverse side of tape.

Display will indicate arrows.

Does loading of tape and display operate properly?

Yes	No
GO to G2.	REMOVE radio chassis with tape player for service.

G2 TAPE PLAYER SEEK TEST (ESC)

Press AMS button. AMS will be displayed.
Press SEEK (>) button to change tape to next selection. Then press SEEK (<)button to return to beginning of selection currently being heard.

Does SEEK operate properly?

Yes	No
GO to G3.	REMOVE radio chassis with tape player for service.

G3 TAPE PLAYER REV/FF TEST (ESC)

Press the left side of REV/FF button to rewind tape playing forward. Return to tape play by pressing right side of button.
Press the right side of REV/FF button to fast-forward tape playing forward. Return to play by pressing left side of button.
Pressing both sides of REV/FF button simultaneously will reverse tape to opposite side (track) of tape.

Does REV/FF operate properly?

Yes	No
GO to G4.	REMOVE radio chassis with tape player for service.

G4 TAPE PLAYER DOLBY TEST (ESC)

Press memory button (3) to select Dolby® Noise Reduction. Verify quality of sound.
Eject tape and verify Dolby® for Dynamic Noise Reduction on an FM stereo station. Verify sound.

Does DOLBY operate properly?

Yes	No
GO to G5.	REMOVE radio chassis with tape player for service.

G5 TAPE PLAYER EJECT TEST (ESC)

Press EJECT or EJCT button to eject tape from opening. Radio chassis will resume playing if power is on.

NOTE: Tapes can be ejected with or without key on or ignition switch power.

Does EJECTING operate properly?

Yes	No
GO to G6.	REMOVE radio chassis with tape player for service.

G6 TAPE PLAYER RADIO SPEAKER CONTROL TEST

Press AUDIO button for BASS, TREBLE, BALANCE and FADER respectively, operating the VOLUME (+) and (-) for all conditions.
Press just VOLUME in both conditions to verify loudness.

Do all speaker controls operate properly?

Yes	No
REFER to Symptom Chart to determine if an inoperative condition exists.	CHECK radio speakers and connections. REFER to Symptom Chart if diagnosis finds radio speakers inoperative. If speaker controls inoperative in radio chassis, REMOVE radio chassis with tape player for service.