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Home >> Buick >> 2022 >> Encore FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 21 (Wiper System And Washer System) >> Diagnostic Information and Procedures >> Rear Washer System Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2022 Buick Envision. However, it is still accessible from the selected car via links, so may be relevant.

Windshield Wiper and Washer Switch Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the connector at the S82 Windshield Wiper and Washer Switch. It may take up to 2 min for all vehicle systems to power down.
  2. Verify a test lamp illuminates between the low reference circuit terminal 1 and B+.
    • If test lamp does not illuminate 
    1. Test circuit 6009 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found.
    2. Replace the K9 Body Control Module.
    • Go to next step: If test lamp illuminates 
  3. Ignition ON.
  4. Test for 4.8 - 5.2 V between circuit terminal 4 and ground.
    • If greater than 5.2 V 
    1. Test circuit 94 for a short to voltage.
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to voltage is not found.
    2. Replace the K9 Body Control Module.
    • If less than 4.8 V 
    1. Test circuit 94 for a short to ground.
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    2. Test circuit 94 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found.
    3. Replace the K9 Body Control Module.
    • Go to next step: If 4.8 - 5.2 V 
  5. Test or replace the S82 Windshield Wiper and Washer Switch.

Windshield Washer Pump Malfunction

  1. Ignition OFF, and all vehicle systems OFF, disconnect the connector at the G19 Rear Window Washer Pump. It may take up to 2 min for all vehicle systems to power down.
  2. Verify a test lamp illuminates between the G19 Rear Window Washer Pump ground circuit terminal 2 and B+.
    • If test lamp does not illuminate 

      Repair the open/high resistance on circuit 1150 or ground connection

    • Go to next step: If test lamp illuminates 
  3. Connect a test lamp between the control circuit terminal 1 and the ground circuit terminal 2, ignition ON.
  4. Verify the test lamp does not turn ON and OFF when requesting rear window wash with the S82 Windshield Wiper and Windshield Washer Switch.
    • If the test lamp turns ON and OFF 

      Replace the G19 Rear Window Washer Pump

    • Go to next step: If the test lamp does not turn ON and OFF 
  5. Ignition OFF, connect the connector at the G19 Rear Window Washer Pump. Disconnect the X5 connector at the X50A Fuse Block - Underhood, ignition ON
  6. Verify the G19 Rear Window Washer Pump is not activated.
    • If the G19 Rear Window Washer Pump is activated 
    1. Test circuit 392 for a short to voltage.
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to voltage is not found.
    2. Replace the G19 Rear Window Washer Pump.
    • Go to next step: If the G19 Rear Window Washer Pump is not activated 
  7. Connect a 20 A fused jumper wire between the control circuit terminal F2 X5 and B+.
  8. Verify the G19 Rear Window Washer Pump activates.
    • If the G19 Rear Window Washer Pump does not activate 
    1. Test circuit 392 for a short to ground.
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    2. Test circuit 392 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found.
    3. Replace the G19 Rear Window Washer Pump.
    • Go to next step: If the G19 Rear Window Washer Pump activates 
  9. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down.
  10. Verify a test lamp illuminates between the X50A Fuse Block - Underhood ground circuit terminal H2 and B+.
    • If test lamp does not illuminate 

      Repair the open/high resistance on circuit 1150 or ground connection.

    • Go to next step: If test lamp illuminates 
  11. Connect the X5 connector at the X50A Fuse Block - Underhood. Disconnect the X2 connector at the K219 Lighting Control Module, ignition ON.
  12. Verify the G19 Rear Window Washer Pump is not activated.
    • If the G19 Rear Window Washer Pump is activated 
    1. Test circuit 2270 for a short to voltage.
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to voltage is not found.
    2. Replace the X50A Fuse Block - Underhood.
    • Go to next step: If the G19 Rear Window Washer Pump is not activated 
  13. Connect a 3 A fused jumper wire between the control circuit terminal 4 and B+.
  14. Verify the G19 Rear Window Washer Pump activates.
    • If the G19 Rear Window Washer Pump does not activate 
    1. Test circuit 2270 for a short to ground.
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    2. Test circuit 2270 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • If less than 2 Ω, test or replace the X50A Fuse Block - Underhood.
      • Go to next step: If an open/high resistance is not found.
    3. Replace the X50A Fuse Block - Underhood.
    • Go to next step: If the G19 Rear Window Washer Pump activates 
  15. Replace the K219 Lighting Control Module.
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