2007 Liberty KJ Factory Service Manual 8 - ELECTRICAL

AUDIO/VIDEO

DESCRIPTION

Several combinations of radio receivers and speaker systems are offered on this model. The audio system uses an ignition switched source of battery current so that the system will only operate when the ignition switch is in the RUN or ACCESSORY positions.

The audio system includes the following components:

Certain functions and features of the audio system rely upon resources shared with other electronic modules in the vehicle over the Programmable Communication Interface (PCI) bus network. The data bus network allows the sharing of sensor information. For diagnosis of these electronic modules or of the data bus network, the use of a scan tool and the proper Diagnostic Procedures information is recommended.

OPERATION

The audio system components are designed to provide audio entertainment and information through the reception, tuning and amplification of locally broadcast radio signals in both the Amplitude Modulating (AM) and Frequency Modulating (FM) commercial frequency ranges.

The audio system components operate on battery current received through a fuse in the Junction Block (JB) on a fused ignition switch output (run-acc) circuit so that the system will only operate when the ignition switch is in the Run or Accessory positions.

On vehicles that are equipped with the optional remote radio switches, the Body Control Module (BCM) receives hard wired resistor multiplexed inputs from the remote radio switches. The programming in the BCM allows it to process those inputs and send the proper messages to the radio receiver over the Programmable Communication Interface (PCI) bus network to control the radio volume up or down, station seek up or down, preset station advance, and mode advance functions.

Refer to the owner's manual for more information on the features, use and operation of each of the available audio systems.

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 information.

Refer to the appropriate wiring information.

WARNING: Disable the airbag system before attempting any steering wheel, steering column, seat belt tensioner, side airbag, or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the airbag system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the airbag system. Failure to take the proper precautions could result in accidental airbag deployment and possible personal injury.


AUDIO SYSTEM DIAGNOSIS TABLE

CONDITION
  		 POSSIBLE CAUSES
  		 CORRECTION
  
NO AUDIO
  

1. Fuse faulty.

 

1. Check radio fuse and Ignition-Off Draw (IOD) fuse in Junction Block (JB). Replace fuses, if required.

 
 

2. Radio connector faulty.

 

2. Check for loose or corroded radio connector. Repair, if required.

 
 

3. Wiring faulty.

 

3. Check for shorted or open wires. Repair wiring, if required.

 
 

4. Radio ground faulty.

 

4. Check for continuity between radio chassis and a known good ground. There should be continuity. Repair ground, if required.

 
 

5. Radio faulty.

 

5. Refer to appropriate Diagnostic Service Manual.

 
 

6. Speakers faulty.

 

6. Replace speaker as necessary.

 
 

7. Choke and relay faulty

 

7. Replace choke and relay as necessary.

 
NO RADIO DISPLAY
  

1. Fuse faulty.

 

1. Check radio fuse and Ignition-Off Draw (IOD) fuse in Junction Block (JB). Replace fuses, if required.

 
 

2. Radio connector faulty.

 

2. Check for loose or corroded radio connector. Repair, if required.

 
 

3. Wiring faulty.

 

3. Check for battery voltage at radio connector. Repair wiring, if required.

 
 

4. Radio ground faulty.

 

4. Check for continuity between radio chassis and a known good ground. There should be continuity. Repair ground, if required.

 
 

5. Radio faulty.

 

5. Refer to appropriate Diagnostic Service Manual.

 
CLOCK WILL NOT KEEP SET TIME
  

1. Fuse faulty.

 

1. Check Ignition-Off Draw (IOD) fuse in the Junction Block (JB). Replace fuse, if required.

 

2. Radio connector faulty.

 

2. Check for loose or corroded radio connector. Repair, if required.

 		  

3. Wiring faulty.

 

3. Check for battery voltage at radio connector. Repair wiring, if required.

 		  

4. Radio ground faulty.

 

4. Check for continuity between radio chassis and a known good ground. There should be continuity. Repair ground, if required.

 		  

5. Radio faulty.

 

5. Refer to appropriate Diagnostic Service Manual.

 		  
POOR RADIO RECEPTION
  

1. Antenna faulty.

 

1. (Refer to 8 - ELECTRICAL/AUDIO/ANTENNA BODY & CABLE - DIAGNOSIS AND TESTING).

 

2. Radio ground faulty.

 

2. Check for continuity between radio chassis and a known good ground. There should be continuity. Repair ground, if required.

 		  

3. Radio noise suppression faulty.

 

3. Repair or replace ground strap as necessary.

 		  

4. Radio faulty.

 

4. Refer to appropriate Diagnostic Service Manual.

 		  
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/POOR TAPE OPERATION
  

1. Faulty tape.

 

1. Insert known good tape and test operation.

 

2. Foreign objects behind tape door.

 

2. Remove foreign objects and test operation.

 		  

3. Dirty cassette tape head.

 

3. Clean head with Mopar Cassette Head Cleaner.

 		  

4. Faulty tape deck.

 

4. Exchange or replace radio, if required.

 		  
NO COMPACT DISC OPERATION
  

1. Faulty CD.

 

1. Insert known good CD and test operation.

 

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. Faulty CD player.

 

4. Refer to appropriate Diagnostic Service Manual.