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Home >> GMC >> 2018 >> Terrain SL >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Wiper/Washer Systems >> Wiper System And Washer System >> Diagnostic Information And Procedures >> DTC B370B: Rear Wiper Function Control Circuit >> Circuit/System Verification
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Circuit/System Verification

  1. Ignition ON.
  2. Verify the scan tool Rear Closure Ajar Switch parameter changes between Inactive and Active when opening and closing the liftgate.
    • Go to next step: If the parameter changes 
  3. Verify the rear wiper turns ON and OFF when commanding the Rear Wiper Active and Inactive with a scan tool.
    • If the rear wiper does not turn ON and OFF 

      Refer to Circuit/System Testing

    • Go to next step: If the rear wiper turns ON and OFF 
  4. All OK.