VUE FWD V6-3.5L (2008)
Heated Glass Element: Testing and Inspection
Rear Window Defogger Malfunction
Diagnostic Instructions
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PerformDiagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System Check -
Vehicle) prior to using this diagnostic procedure.
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ReviewStrategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
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Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure Instructions)
provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
Battery positive voltage is supplied through the underhood fuse block to the defog relay switched input. When the rear defog switch button is pressed,
the HVAC control module energizes the defog relay by providing a B+ to the control circuit of the defog relay. This allows battery positive voltage from
the relay switched input through the switch contacts and out the relay switched output to the rear window defogger grid. The HVAC control module
houses the rear defog switch and also illuminates the rear defog indicator on the switch button, upon this request. Ground for the rear window defogger
grid is provided by G401 .
When you start the engine and press the rear defog switch button, the defog cycle lasts for 10 minutes. Further operation will result in 5 minute defog
cycles.
The rear defogger feature will not time out if vehicle speed is above 48 km/h (30 mph).
If battery voltage is low, the rear defogger feature will be disabled.
Reference Information
Schematic Reference
Defogger Schematics (See: Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Rear Window Defogger Description and Operation (See: Windows/Description and Operation/Rear Window Defogger Description and Operation)
Electrical Information Reference
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Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics)
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Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics)
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Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics)
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Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for Scan Tool Information
