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Circuit/System Verification

  1. Ignition ON, observe the scan tool Rear Defog Switch parameter while pressing the Rear Defogger Switch. The reading should change between ON and OFF.
    • If the reading does not change between the commanded states, refer to Rear Defogger Switch Malfunction in Circuit/System Testing
  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 in Circuit/System testing.
    • If the Defogger Indicator does not illuminate, replace the HVAC control module.
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