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Home >> Cadillac >> 2018 >> CT6 Plug-In >> Repair and Diagnosis >> Body & Frame >> Windows >> Fixed And MOVEABLE Window System >> Diagnostic Information and Procedures >> Rear Window Defogger Malfunction >> Circuit/System Verification
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Circuit/System Verification

  1. Ignition - On/Vehicle - In Service Mode
  2. Operate the component: Rear Defogger Switch - Pressed

    Verify the component turns On and Off: E18 Rear Defogger Grid

    • If the component does not turn On and Off 

      Refer to: Circuit/System Testing

    • Go to next step: If the component turns On and Off 
  3. Perform the scan tool control function: Illuminate All Indicators - On and Off

    Verify the component turns On and Off: Rear Defogger Indicator

    • If the component does not turn On and Off 

      Replace the component: A26 HVAC Controls

    • Go to next step: If the component turns On and Off 
  4. All OK.
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