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Home >> Chevrolet >> 2018 >> Corvette Z51, 2D Convertible, Standard Trans >> 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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