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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 222 (Fixed And MOVEABLE Window System) >> Diagnostic Information and Procedures >> Rear Window Defogger Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
  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 P17 Info Display Module.

    • If the parameter changes between On and Off 
  3. Verify the rear window defog indicator turns ON and OFF when commanding the Illuminate All Indicators On and Off with a scan tool.
    • If the rear window defog indicator does not turn ON and OFF 

      Replace the P17 Info Display Module.

    • If the rear window defog indicator turns ON and OFF 
  4. 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 
  5. All OK.
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