For 1990-2009 cars

Important: Review the system operation in order to familiarize yourself with the system functions. Refer to Radio/Audio System Operation .

### Visual/Physical Inspection

• | Inspect for aftermarket devices which could affect the operation of the radio. 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:

• | Antenna Diagnostic Check

• | Radio Poor Reception

• | Compact Disc General Diagnosis

• | Compact Disc Inoperative

• | Radio Display Inoperative, Speakers Operative

• | Radio Controls Inoperative

• | Radio Displays LOC, LOCKED, or CODE

• | Radio Buttons Do Not Dim with Instrument Panel Dimmer Switch

• | Radio Display Inoperative, Speakers Operative

• | Radio Display Inoperative, No Sound from Speakers

• | Radio Memory Inoperative

• | Speakers General Diagnosis

• | Speakers Inoperative - One

• | Tape Player Inoperative