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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 643 (Fixed & MOVEABLE Window Systems) >> Diagnostic Information and Procedures >> Rear Window Defogger Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, observe the scan tool Manual HVAC Rear Defog Sw parameter while pressing the defog switch. The reading should change between ON and OFF.
    • If the reading does not change between the commanded states, refer to HVAC Defog Switch Malfunction below.
  2. Command the rear window defogger ON and OFF with the scan tool. The rear window defogger and defogger indicator should turn ON and OFF when changing between the commanded states.
    • If the rear window defogger does not turn ON and OFF when changing between the commanded states, refer to Rear Defogger Malfunction below.
    • If the Defogger Indicator does not illuminate or continuously illuminates, refer to Rear Defogger Indicator Malfunction below.
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