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Home >> Chevrolet >> 2017 >> SS Automatic Trans >> 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 scan tool parameter: Rear Defogger Switch = Off & On

    • If not the specified state 

      Replace the component: A26 HVAC Controls

    • If the specified state 
  3. 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

    • If the component turns On and Off 
  4. Operate the component: Rear Defogger Switch - Pressed
  5. 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

    • If the component turns On and Off 
  6. All OK.
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