A Symptoms

IMPORTANT: The following steps must be completed before using the symptom tables.

1. Perform A Diagnostic System Check - Defogger or A Diagnostic System Check - Automatic Day-Night Mirror in order to verify that all of the following are true:
- There are no DTCs set.
- The control module(s) can communicate via the serial data link.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to
- Rear Window Defogger Operation
- Automatic Day-Night Mirrors Circuit Description

Visual/Physical Inspection
- Inspect for aftermarket devices which could affect the operation. Refer to Checking Aftermarket Accessories in Diagrams.
- 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 and Poor Connections in Diagrams.

Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
- Defogger Inoperative - Rear Window
- Mirrors - Outside Automatic Day-Night Feature Inoperative
- Mirrors - Compass Inoperative or Inaccurate