Important: For the rear window defogger system, the following steps must be performed before
using the symptom tables.
- Perform the
Diagnostic System Check - Vehicle, before using the symptom tables
in order to verify that all of the following 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. |
• | 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.
Symptom List
Refer to a symptom diagnostic procedure from the following list in order to
diagnose the symptom: