Many conditions that affect the operation of an audio system can be corrected without removing components from the vehicle. Before attempting to diagnose an audio system condition, be sure that the battery is fully charged. Batteries supplying less than 9 volts will cause improper diagnosis of the audio system.
The audio system uses the serial data line to receive information from several independent systems in the vehicle (BCM, DCM, etc.) in order to operate. The data may be accessed using a scan tool connected to the data link connector (DLC), located under the instrument panel on the driver's side.
Within the (Bose®) audio system, a different form of communications is used to allow certain components (Bose® signal processing module, radio control, etc.) to communicate. This communication between components is necessary in order to coordinate the operation of the system.
To help pinpoint the cause, always determine the exact nature of the audio system concern. Determine the following:
| • | Is the condition intermittent or constant? |
| • | Does the condition occur with the engine OFF or running? |
| • | Does the condition occur with the vehicle parked or moving? |
Radio
For further diagnostic information, refer to A Diagnostic System Check - Radio/Audio System .
For radio wiring schematics information, refer to Radio/Audio System Schematics.
For the radio replacement procedure, refer to Radio Replacement .
Static and Noise
Ground strap connections must be clean and tight. Spark plug cables must be TVRS-type and in good condition. Resistance-type spark plugs must be used.
The A/C blower motor has a built-in capacitor. Extra electrical equipment added to the vehicle could cause static if not properly grounded or if the wiring is improperly routed.
For further diagnostic information, refer to A Diagnostic System Check - Radio/Audio System .
For radio wiring schematics information, refer to Radio/Audio System Schematics.
Popping Noise
Operating devices such as the turn signals, the stoplamps, the cigar lighter, etc. may cause a popping noise on distant (weak) AM signals.
For further diagnostic information, refer to A Diagnostic System Check - Radio/Audio System .
For audio system wiring schematics, refer to Radio/Audio System Schematics.
