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Home >> Hummer >> 2010 >> H3 Base, Standard >> Repair and Diagnosis >> Body & Frame >> Fixed And MOVEABLE Windows >> Diagnostic Information and Procedures >> Rear Window Defogger Malfunction >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON, observe the scan tool Rear Defog 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 Rear Defog Relay ON and OFF with a scan tool. The rear window defogger and rear window 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 Window Defogger Malfunction.
    • If the rear window defogger indicator is always ON or always OFF, refer to Rear Window Defogger Indicator Malfunction.
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