For 1990-2009 cars only
Important: For the Automatic Day-Night Mirror and Rear Window Defogger (w/oC68) systems, 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, the following steps must be performed before using the symptom tables.
- Perform the Diagnostic System Check - Defogger before using the symptom tables in order to verify that all of the following 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 .
| • | There are no DTCs set. |
| • | The control module(s) can communicate via the serial data link. |
Visual/Physical Inspection
| • | Inspect for aftermarket devices which could affect the operation of the Rear Window Defogger and Automatic Day-Night Mirror systems. 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:
