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Home >> Chevrolet >> 2018 >> Sonic LS, 1.8L Eng VIN H, Automatic 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: K33 HVAC Control Module

    • 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: K33 HVAC Control Module

    • Go to next step: If the specified state 
  4. 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 below

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

    Verify the component turns On and Off: Rear Defogger Indicator

    • If not the specified state 

      Test or replace the component: K33 HVAC Control Module

    • Go to next step: If the specified state 
  6. All OK.
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