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Circuit/System Verification

  1. Engine running.
  2. Verify the scan tool Rear Defogger Switch parameter changes between On and Off when pressing the rear window defogger switch.
    • If the parameter does not change between On and Off 

      Replace the A26 HVAC controls.

    • If the parameter changes between On and Off 
  3. Verify the E18 Rear Defogger Grid turns ON and OFF when commanding the Rear Defogger On and Off with a scan tool.
    • If the E18 Rear Defogger Grid does not turn ON and OFF 

      Refer to Circuit/System Testing

    • If the E18 Rear Defogger Grid turns ON and OFF 
  4. Verify the rear defogger indicator turns ON and OFF when pressing the rear window defogger switch.
    • If the rear defogger indicator does not turn ON and OFF 

      Replace the A26 HVAC controls.

    • If the rear defogger indicator turns ON and OFF 
  5. All OK.
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