For 1990-2009 cars only
Important: For the inside rearview mirror with the automatic day-night feature or the rear window defogger (w/o C68), review the system operation in order to familiarize yourself with the system functions. Refer to the following: For the rear window defogger (w/ C68) system, perform the following steps before using the symptom tables.
- Perform the Diagnostic System Check - Vehicle in Vehicle DTC Information, before using the symptom tables in order to verify that all of the following conditions are true:
- Review the rear window defogger system operation in order to familiarize yourself with the system functions. Refer to Rear Window Defogger Description and Operation .
| • | No DTCs are set. |
| • | The control modules can communicate via the serial data link. |
Visual/Physical Inspection
| • | Inspect for aftermarket devices which could affect the operation of the rear window defogger or the automatic day-night feature of the inside rearview mirror. 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
Bad electrical connections or bad 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:
