For 1990-2009 cars

Important: Review the system operation in order to familiarize yourself with the system functions.

• | Radio/Audio System Description

• | Radio/Audio System Operation

• | Radio/Audio System Circuit Description

• | Steering Wheel Controls System Description

• | Steering Wheel Controls System Operation

### Visual/Physical Inspection

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

• | 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 in Wiring Systems.

### Symptom List

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

• | Audio System Troubleshooting Hints

• | Radio Poor Reception

• | Audio Distortion - One or More Speakers

• | Compact Disc Inoperative

• | Tape Player Inoperative

• | Steering Wheel Controls Inoperative

• | Speakers Inoperative - One or More

• | Speakers Inoperative - All