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:
• | The control modules 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 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: