A Symptoms

IMPORTANT: Review the system operation in order to familiarize yourself with the system functions. Refer to the following:
^ Rear Window Defogger Description
^ Rear Window Defogger Circuit Description
^ Automatic Day-Night Mirror Description
^ Automatic Day-Night Mirrors Circuit Description

Visual/Physical Inspection
^ Inspect for aftermarket devices which could affect the operation of the rear defogger system. Refer to Checking Aftermarket Accessories in Wiring Systems.
^ Inspect the easily accessible or visible system components for obvious damage or conditions which may 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 Wiring Systems.

Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
^ Defogger Inoperative - Rear Window (W/O E52) or Defogger Inoperative - Rear Window (W/ E52)
^ Defogger Grid Lines Diagnosis
^ Mirrors - Automatic Day-Night Inoperative
^ Mirrors - Automatic Day-Night Mirror Displays OC
^ Mirrors - Automatic Day-Night Mirror Displays SC
^ Mirrors - Compass Inoperative or Inaccurate

For a description of the RPO Code(s) shown in this article refer to the RPO Code List found at Vehicle/Application ID RPO Codes