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.

• | Radio/Audio System Description

• | Radio/Audio System Operation-Radio Controls

• | Radio/Audio System Operation-Cassette Tape Player

• | Radio/Audio System Operation-Compact Disc Player

• | Radio/Audio System Operation-Theftlock

• | Radio/Audio System Operation-RDS Functions

• | Steering Wheel Controls System Circuit Description

### 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

• | Antenna Diagnostic Check

• | Radio Poor Reception

• | Audio Distortion - One or More Speakers

• | Speakers Inoperative -Left or Right - Systems with Remote Amplifier

• | Speakers - No Audio, Radio Display OK - Systems with Remote Amplifier

• | Radio Display and/or Buttons Do Not Illuminate

• | Steering Wheel Controls Inoperative

• | Speakers Inoperative - One or More

• | Speakers Inoperative - All

• | Speakers Inoperative - Subwoofer