Important: The following steps must be completed before doing the Symptom tables.
• | No DTCs are set. |
• | The control modules can communicate via the serial data link. |
• | Inspect for aftermarket devices which could affect the operation of the lighting system. Refer to Checking Aftermarket Accessories . |
• | Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom. |
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom: