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:
• | The control module(s) can communicate via the serial data link. |
- Review the Rear Window Defogger system operation in order to familiarize
yourself with the system functions. Refer to
Rear Window Defogger Description and Operation
.
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: