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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 346 (Wiper System And Washer System) >> Diagnostic Information and Procedures >> Rear Washer System Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. Verify the scan tool Rear Washer Relay Command parameter changes between Active and Inactive when cycling the rear washer switch ON and OFF.
    • If the parameter does not change 

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

    • If the parameter changes 
  3. Verify the G19 Rear Window Washer Pump turns on and off when commanding the Rear Washer Relay Inactive and Active with the scan tool
    • If the G19 Rear Window Washer Pump does not turn ON and OFF 

      Refer to Circuit/System Testing - Rear Washer Pump Malfunction

    • If the G19 Rear Window Washer Pump turns ON and OFF 
  4. All OK.
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