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Home >> Buick >> 2017 >> Envision Base >> Repair and Diagnosis >> Accessories & Equipment >> Wiper/Washer Systems >> Wiper System And Washer System >> Diagnostic Information and Procedures >> Rear Wiper System Malfunction >> Circuit/System Verification

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.
    • If the parameter changes 
  3. Verify the scan tool Rear Wiper Switch parameter changes between Off and On when turning the rear wipers ON and OFF.
    • If the parameter does not change 

      Refer to Circuit/System Testing - Rear Wiper/Washer Switch Malfunction.

    • If the parameter changes 
  4. Verify the M45 Rear Wiper Motor turns On when commanding the Rear Wiper Active and Inactive with a scan tool.
    • If the Rear Wiper Motor does not turn ON 

      Refer to Circuit/System Testing - Rear Wiper Motor Malfunction

    • If the Rear Wiper Motor turns ON 
  5. Verify the Rear Wiper finishes the wiping cycle and will park at the end of the rear window when cycling the S82 Rear Wiper/Washer Switch Malfunction from Rear Wiper to Off.
    • If the Rear Wiper does not park at the end of the rear window 

      Refer to Circuit/System Testing - Wiper Park Feature Malfunction

    • If the Rear Wiper park at the end of the rear window 
  6. All OK.
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