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Home >> Pontiac >> 2007 >> G5 Base, Automatic >> Repair and Diagnosis >> Body & Frame >> Windows >> Fixed & MOVEABLE Window Systems >> Diagnostic Information and Procedures >> Rear Window Defogger Malfunction >> Circuit/System Verification
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Circuit/System Verification

  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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