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Circuit/System Testing

WARNING: This page is about a different car, the 2018 Buick Regal TourX and 2018 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.

Rear Wiper/Washer Switch Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the X3 harness connector at the S82 Windshield Wiper/Washer Switch. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the low reference circuit terminal 1 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
    • Go to next step: If less than 10 Ω 
  3. Ignition ON.
  4. Test for greater than 8 V between the signal circuit terminal 5 and ground.
    • If less than 8 V 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the signal circuit and ground
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
    • Go to next step: If 8 V or greater 
  5. Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module, ignition ON.
  6. Test for less than 1 V between the S82 Windshield Wiper/Washer Switch signal circuit terminal 5 and ground.
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 1 V 
  7. Test or replace the S82 Windshield Wiper/Washer Switch.

Rear Washer Pump Malfunction

  1. Ignition OFF, and all vehicle systems OFF. Disconnect the X1 harness connector at the X50A Fuse Block - Underhood. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the X50A Fuse Block - Underhood ground circuit terminal 53 and ground.
    • If 10 Ω or greater 
    1. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 Ω 
  3. Test for infinite resistance between each control circuit listed below and ground:
    1. Terminal 2 X1
    2. Terminal 1 X1
    • If less than Infinite resistance 

      Repair the short to ground on the circuit.

    • Go to next step: If infinite resistance 
  4. Disconnect the harness connector at the G24 Windshield Washer Pump and connect the X1 harness connector at the X50A Fuse Block - Underhood.
  5. Test for less than 10 Ω between the control circuit terminal 1 and the control circuit terminal 2.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the X1 harness connectors at the X50A Fuse Block - Underhood.
    2. Test for less than 2 Ω in each of the control circuits listed below end to end:
      • Terminal 2
      • Terminal 1
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the X50A Fuse Block - Underhood.
    • Go to next step: If less than 10 Ω 
  6. Connect a test lamp between the control circuit terminal 1 and the control circuit terminal 2, ignition ON.
  7. Verify the test lamp does NOT turn ON and OFF when commanding the Rear Window Washer Relay Active and Inactive with a scan tool.
    • If the test lamp turns ON and OFF 

      Test or replace the G24 Windshield Washer Pump.

    • Go to next step: If the test lamp does not turn ON and OFF 
  8. Ignition OFF, connect the harness connector at the G24 Windshield Washer Pump, ignition ON.
  9. Verify the G24 Windshield Washer Pump is NOT activated.
    • If the G24 Windshield Washer Pump is activated 
    1. Ignition OFF, disconnect the harness connector at the G24 Windshield Washer Pump, ignition ON.
    2. Test for less than 1 V between each of the control circuits listed below and ground:
      • Terminal 1
      • Terminal 2
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the G24 Windshield Washer Pump.
    • Go to next step: If the G24 Windshield Washer Pump is not activated 
  10. Ignition OFF, disconnect the X5 harness connector at the K9 Body Control Module, ignition ON.
  11. Verify the G24 Windshield Washer Pump is NOT activated.
    • If the G24 Windshield Washer Pump is activated 
    1. Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood, ignition ON.
    2. Test for less than 1 V between the X50A Fuse Block - Underhood control circuit terminal 52 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the X50A Fuse Block - Underhood.
    • Go to next step: If the G24 Windshield Washer Pump is not activated 
  12. Connect a 10 A fused jumper wire between the control circuit terminal 11 X5 and B+.
  13. Verify the G24 Windshield Washer Pump activates.
    • If the G24 Windshield Washer Pump does not activate 
    1. Ignition OFF, remove the jumper wire, disconnect the X2 harness connector at the X50A Fuse Block - Underhood.
    2. Test for infinite resistance between the X50A Fuse Block - Underhood control circuit terminal 52 X2 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If less than infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the X50A Fuse Block - Underhood.
    • Go to next step: If the G24 Windshield Washer Pump activates 
  14. Replace the K9 Body Control Module.
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