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

Inspect for aftermarket devices which could affect the operation of the radio/audio system. Refer to Checking Aftermarket Accessories in Wiring Systems.

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

Faulty electrical connections or wiring may cause intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

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