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:
•
Amplifier choke and relay (with premium speaker system only)
•
Antenna
•
Compact disc changer (if equipped)
•
Power amplifier mounted to each front door speaker (with premium speaker system only)
•
Radio noise suppression components
•
Radio receiver
•
Remote radio switches (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 shar-
ing 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 ten-
sioner, 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 per-
forming 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
8A - 32
AUDIO/VIDEO
KJ