For 1990-2009 cars

Important: The following steps must be completed before using the symptom tables.

1. Perform the Diagnostic System Check - Radio/Audio System before using the Symptom Tables in order to verify that all of the following are true:

• | There are no DTCs set.

• | The control module(s) can communicate via the serial data link.

2. Review the system operation in order to familiarize yourself with the system functions. Refer to the following system operations:

• | Radio/Audio System Operation

• | Video System Operation

### Visual/Physical Inspection

• | Inspect for aftermarket devices which could affect the operation of the Entertainment System. Refer to Checking Aftermarket Accessories

• | Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

### Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections

### Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom.

• | Radio Poor Reception

• | Radio Controls Inoperative - Rear Seat

• | Radio Display/Illumination Inoperative with Park Lamps On

• | Rear Seat Audio Power Indicator Always On

• | Steering Wheel Controls Inoperative

• | Speakers Inoperative - One or More

• | For Video Entertainment System Symptoms, refer to Video System System Check .