Yukon/Denali 2WD V8-6.0L VIN U (2004)
Heated Glass Element: Initial Inspection and Diagnostic Overview
Diagnostic Starting Point - Heated Glass Element
DIAGNOSTIC STARTING POINT
For the inside rearview mirror with the automatic day-night feature, begin the diagnosis by reviewing the system Description and Operation. Reviewing
the Description and Operation information will help you determine the correct symptom diagnostic procedure when a malfunction exists. Reviewing the
Description and Operation information will also help you determine if the condition described by the customer is normal operation. Refer to Symptoms -
Heated Glass Element in order to identify the correct procedure for diagnosing the system and where the procedure is located. See: Symptom Related
Diagnostic Procedures
For the rear window defogger, begin the diagnosis with the Diagnostic System Check - Defogger. The Diagnostic System Check will provide the
following information:
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The identification of the control modules which command the system
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The ability of the control modules to communicate through the serial data circuit
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The identification of any stored diagnostic trouble codes (DTCs) and their status
The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.
Diagnostic System Check - Heated Glass Element
DIAGNOSTIC SYSTEM CHECK
TEST DESCRIPTION
