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Home › Buick › 2018 › Regal Base › Repair and Diagnosis › Body & Frame › Windows › Fixed And MOVEABLE Window System › Diagnostic Information and Procedures › Rear Window Defogger Malfunction › Circuit/System Verification

Circuit/System Verification

  1. Ignition - On / Vehicle - In Service Mode
  2. Verify the scan tool parameter: Rear Defogger Switch = Off
    • If not the specified state 

      Test or replace the component: A26 HVAC Controls

    • Go to next step: If the specified state 
  3. Operate the component: Rear Defogger Switch - Pressed

    Verify the scan tool parameter: Rear Defogger Switch = On

    • If not the specified state 

      Test or replace the component: A26 HVAC Controls

    • Go to next step: If the specified state 
  4. Perform the scan tool control function: Rear Defogger - On and Off

    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 
  5. All OK.
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