Astra L4-1.8L (2009)
Heated Glass Element: Testing and Inspection
Rear Window Defogger Malfunction
Diagnostic Instructions
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Perform Diagnostic 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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Review Strategy 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
When the rear defogger button is pressed a signal is sent to the rear fuse block which then supplies a ground to the K2 relay coil. The instrument panel
cluster illuminates the rear window defogger indicator. B+ voltage is supplied at all times to the K2 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.
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
Circuit/System Verification
1. Ignition ON, observe the scan tool Defrost Switch parameter while pressing the rear window defogger switch. The parameter should change
between Active and Inactive.
‹› If the value does not change between the commanded states, refer to Rear Window Defogger Switch Malfunction.
2. Command the REC Heated Rear Window Test ON and OFF with a scan tool. The rear window defogger should turn ON and OFF when changing
between the commanded states.
