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Home >> Buick >> 2014 >> Verano Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Wiper/Washer Systems >> Wiper System And Washer System >> Diagnostic Information and Procedures >> DTC B3873: Windshield Wiper/Washer Switch >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON.
  2. Verify the scan tool Windshield Washer Switch parameter changes between Active and Inactive when pressing the windshield washer switch.
    • If the parameter does not change 

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

    • If the parameter changes 
  3. Verify the scan tool Instrument Cluster Washer Fluid Level Switch parameter changes between Closed when the fluid level is low and Open when the fluid level is full.
    • If the parameter does not change 

      Refer to Circuit/System Testing - Windshield Washer Fluid Level Switch Malfunction.

    • If the parameter changes 
  4. Verify the windshield washers turn ON when commanding the Windshield Washer Relay Active with a scan tool.
    • If the windshield washers do not turn ON 

      Refer to Circuit/System Testing - Windshield Washer Pump Malfunction

    • If the windshield washers turn ON 
  5. All OK.
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