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Home >> GMC >> 2008 >> Acadia SLT, AWD >> 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 operation of the rear window defogger grid while pressing the rear defogger switch. The rear defogger grid should ACTIVATE and DEACTIVATE when changing between commanded states.
  2. Command the rear window defogger ON and OFF with the scan tool. The rear window defogger indicator should turn ON and OFF when changing between the commanded states.
    • If the defogger indicator does not illuminate or continuously illuminates, replace the HVAC control module.
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