Diagnosis And Testing: Audio

Any diagnosis of the Audio system should begin with the use of scan tool. For information on the use of the scan tool, refer to the appropriate Diagnostic Service information.

For complete circuit diagrams, refer to the appropriate wiring information.

WARNING:

On vehicles equipped with airbags, refer to RESTRAINTS (SERVICE INFORMATION) - 500 - EXCEPT ELECTRIC before attempting any steering wheel, steering column, or instrument panel component diagnosis or service. Failure to take the proper precautions could result in accidental airbag deployment and possible personal injury.

AUDIO SYSTEM DIAGNOSIS

CONDITION	POSSIBLE CAUSE	CORRECTION
NO AUDIO	1. Fuse inoperative.	1. Check radio fuse in Body Control Module (BCM). Replace fuse as necessary. 2. Check radio fuse in the back of the radio. Replace fuse as necessary.
	2. Radio connector damaged.	2. Check for loose or corroded radio connector. Repair, if required.
	3. Wiring damaged.	3. Check for battery voltage at radio connector. Repair wiring, if required.
	4. Ground damaged.	4. Check for continuity between radio chassis and a known good ground. There should be continuity. Repair ground, if required.
	5. Radio inoperative.	5. Exchange or replace radio, if required.
	6. Amplifier inoperative.	6. Perform diagnosis on amplifier. Replace as necessary.
NO DISPLAY	1. Fuse inoperative.	1. Check radio fuse in Body Control Module (BCM). Replace fuse as necessary. 2. Check radio fuse in the back of the radio. Replace fuse as necessary.
	2. Radio connector damaged.	2. Check for loose or corroded radio connector. Repair, if required.
	3. Wiring damaged.	3. Check for battery voltage at radio connector. Repair wiring, if required.
	4. Ground damaged.	4. Check for continuity between radio chassis and a known good ground. There should be continuity. Repair ground, if required.
	5. Radio inoperative.	5. Exchange or replace radio, if required.
NO MEMORY	1. Fuse inoperative.	1. Check ignition-off draw fuse. Replace fuse as necessary. 2. Check radio fuse in the back of the radio. Replace fuse as necessary.
	2. Radio connector damaged.	2. Check for loose or corroded radio connector. Repair, if required.
	3. Wiring damaged.	3. Check for battery voltage at radio connector. Repair wiring, if required.
	4. Ground damaged.	4. Check for continuity between radio chassis and a known good ground. There should be continuity. Repair ground, if required.
	5. Radio inoperative.	5. Exchange or replace radio, if required.
POOR RADIO RECEPTION	1. Antenna or cable damaged or inoperative.	1. Refer to appropriate service information . Repair or replace antenna, if required.
	2. Ground damaged.	2. Check for continuity between radio chassis and a known good ground. There should be continuity. Repair ground, if required.
	3. Radio inoperative.	3. Exchange or replace radio, if required.
	4. Poor antenna connection at radio or in line.	4. Verify proper connection.
	5. Faulty rear window defogger.	5. Verify that the rear defogger grid is functioning properly, repair as necessary. Refer to DIAGNOSIS AND TESTING .
SOUND DISTORTION (VIBRATION FROM SPEAKER AREA, BUZZING - HUMMING	1. Door trim panel loose or missing fasteners.	1. Inspect door trim panel and correct as necessary. Replace any missing fasteners.
	2. Water shield loose or misaligned.	2. Inspect water shield and adjust as required.
	3. Items placed in door trim panel map pockets vibrating or moving from side to side.	3. Remove items from door trim panel. Ensure that vibration is no longer present.
NO COMPACT DISC OPERATION	1. CD damaged.	1. Insert known good CD and test operation. Avoid the use of "home made" CD's with adhesive labels. The labels may cause disc to become jammed in the radio.
	2. Foreign material on CD.	2. Clean CD and test operation.
	3. Condensation on CD or optics.	3. Allow temperature of vehicle interior to stabilize and test operation.
	4. Radio inoperative.	4. Exchange or replace radio, if required.