Radio/Stereo: Description and Operation

AUDIO SYSTEM
An audio system is standard factory-installed equipment on this model unless the radio delete option is specified. Several combinations of radio receivers 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:
- Antenna
- Antenna - satellite radio (if equipped)
- Multiplexer (if equipped)
- Radio noise suppression components
- Radio receiver
- Satellite receiver module (if equipped)
- Speakers

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 DRB III(R) scan tool and the proper Diagnostic Procedures manual are recommended.

Refer to the appropriate wiring information in this service manual for complete standard and premium audio system circuit diagrams. The wiring information includes proper wire and connector repair procedures, further details on wire harness routing and retention, as well as pin-out and location views for the various wire harness connectors, splices, and grounds.

For operation of the factory installed standard and optional radios with cassette or compact disc player, refer to the Sound Systems Operating Instructions in the Owners Manual supplied with the vehicle.

RADIO
Available factory-installed radio receivers for this model include:
- AM/FM/cassette/CD (RAZ sales code)
- AM/FM/cassette with CD changer control feature (RBB sales code)
- AM/FM/CD with CD changer control (RBK sales code)
- AM/FM/cassette/CD with CD changer control (RAD, RBT or RBY sales code) - export only

All factory-installed radio receivers can communicate on the Programmable Communications Interface (PCI) data bus network. All factory-installed receivers are stereo Electronically Tuned Radios (ETR) and include an electronic digital clock function.

These radio receivers can only be serviced by an authorized radio repair station. See the latest Warranty Policies and Procedures manual for a current listing of authorized radio repair stations.

The radio receiver operates on ignition switched battery current that is available only when the ignition switch is in the On or Accessory positions. The electronic digital clock function of the radio operates on fused battery current supplied through the JOD fuse, regardless of the ignition switch position.

For more information on the features, setting procedures, and control functions for each of the available factory-installed radio receivers, refer to the owner 5 manual. For complete circuit diagrams, refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.

RADIO NOISE SUPPRESSION GROUND STRAP
Some components used on the vehicles are equipped with a capacitor to suppress radio frequency interference/static.

Ground straps are mounted from the engine to each shock tower and from the body to the muffler. The ground straps should be securely tightened to assure good metal to metal contact.

Capacitors are mounted in various locations internal to the generator, instrument cluster and windshield wiper motor.

Ground straps conduct very small high frequency electrical signals to ground and require clean large surface area contact.