A Symptoms

SYMPTOMS

IMPORTANT:
- For the inside rearview mirror with the automatic day-night feature, review the system operation in order to familiarize yourself with the system functions. Refer to Automatic Day-Night Mirror Description and Operation.
- For the rear window defogger system, the following steps must be performed before using the symptom tables.

1. Perform the Diagnostic System Check - Vehicle, before using the symptom tables in order to verify that all of the following are true: Refer to Diagnostic System Check - Vehicle. Diagnostic System Check - Vehicle

- There are no DTCs set.
- The control modules can communicate via the serial data link. Diagnostic System Check - Vehicle
2. 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.
- 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.

Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
- Defogger Inoperative - Rear Window
- Defogger Indicator Always On
- Defogger Grid Lines Diagnosis
- Mirrors - Automatic Day-Night Inoperative