For 1990-2009 cars

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

### Visual/Physical Inspection

• | Inspect for aftermarket devices which could affect the operation of the Radio/Audio 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:

• | Audio/Video Disc Player Adapter - Audio or Video Inoperative or Degraded Quality

• | Audio Distortion - One or More Speakers

• | Digital Radio Poor or No Reception

• | Radio Displays LOC, LOCKED, or CODE

• | Radio Displays CAL or CAL ERR

• | Radio Poor Reception

• | Reduced Volume - One or More Speakers

• | Speakers Inoperative - One or More

• | Video Display is Poor or Blank

• | Video Entertainment System Inoperative

• | Video Entertainment System Remote Control Inoperative

• | Video Entertainment System Wireless Headphone Inoperative