TrailBlazer 4WD L6-4.2L VIN S (2002)
Heated Glass Element: Symptom Related Diagnostic Procedures
A 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 Inside Rearview 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 - Defogger before using the symptom tables in order to verify that all of the following are true:
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There are no DTCs set.
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The control module(s) can communicate via the serial data link. See: Initial Inspection and Diagnostic Overview/Diagnostic System Check -
Heated Glass Element
2. Review the system operation in order to familiarize yourself with the system functions. Refer to Rear Window Defogger Description and
Operation.
Visual/Physical Inspection
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Inspect for aftermarket devices which could affect the operation of the rear window defogger and the automatic day-night feature of the inside
rearview mirror. Refer to Checking Aftermarket Accessories in Diagnostic Aids.
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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
Diagnostic Aids.
Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
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Defogger Inoperative - Rear Window
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Defogger Grid Lines Diagnosis
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Mirrors - Automatic Day-Night Inoperative
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Mirrors - Automatic Day-Night Mirror Displays OC
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Mirrors - Automatic Day-Night Mirror Displays SC
