Suburban 1/2 Ton 2WD V8-5.3L VIN T (2004)
Heated Glass Element: Symptom Related Diagnostic Procedures
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 - 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 modules 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 or the automatic day-night feature of the inside
rearview mirror.
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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.
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 (w/ Cargo Doors) Defogger Inoperative - Rear Window (w/o Cargo Doors)
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Defogger Grid Lines Diagnosis
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Mirrors - Automatic Day-Night Inoperative
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Mirrors - Temperature Displays SC or OC
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Mirrors - Compass Display Inoperative or Inaccurate
Automatic Day/Night Mirror Inoperative - Mirrors
MIRRORS - AUTOMATIC DAY-NIGHT INOPERATIVE
DIAGNOSTIC AIDS
The automatic day-night feature of the inside rearview mirror may not operate properly or become inoperative due to an intermittent short to battery
voltage in the backup lighting system.
TEST
