For 1990-2009 cars

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.

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 Radio/Audio System Check .

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 plugs and spark plug cables must be the right type and in good condition.

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 Radio/Audio System Check .

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 Radio/Audio System Check .

For audio system wiring schematics, refer to Radio/Audio System Schematics .