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Circuit/System Testing

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.

Windshield Washer Switch Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S82 Windshield Wiper/Washer Switch. It may take up to 11 minutes for all vehicle systems to power down.
  2. Test for less than 10 Ω between the low reference circuit terminal 2 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
    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. Verify the scan tool Windshield Washer Switch parameter is Inactive.
    • If not Inactive 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the signal circuit terminal 5 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K9 Body Control Module.
    • Go to next step: If Inactive 
  5. Install a 3 A fused jumper wire between the signal circuit terminal 5 and the low reference circuit terminal 2.
  6. Verify the scan tool Windshield Washer Switch parameter is Active.
    • If not Active 
    1. Ignition OFF, remove the jumper wire, disconnect the harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    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 Active 
  7. Test or replace the S82 Windshield Wiper/Washer Switch.

Windshield 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 11 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal 48 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. 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. Connect the X1 harness connector at the X50A Fuse Block - Underhood, disconnect the harness connector at the G24 Windshield Washer Pump. It may take up to 2 min for all vehicle systems to power down.
  4. Test for less than 10 Ω between the control circuit terminals listed below and ground:
    • Control circuit terminal 1
    • Control circuit terminal 2
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the X50A Fuse Block - Underhood.
    2. 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, replace the X50A Fuse Block - Underhood.
    • Go to next step: If less than 10 Ω 
  5. Connect a test lamp between the control circuit terminal 1 and ground, ignition ON.
  6. Verify the test lamp does not turn ON and OFF when commanding the Windshield Washer Relay On and Off 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 
  7. Ignition OFF, connect the harness connector at the G24 Windshield Washer Pump. Disconnect the X12 harness connector at the X50A Fuse Block - Underhood, ignition ON.
  8. 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 the G24 Windshield Washer Pump control circuit terminals listed below and ground:
      • Control circuit terminal 1
      • Control circuit terminal 2
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, test or replace the G24 Windshield Washer Pump.
      • Go to next step: If the G24 Windshield Washer Pump is not activated 
  9. Connect a 10 A fused jumper wire between the control circuit terminal 14 X1 and B+. Momentarily install a jumper wire between the control circuit terminal 49 X1 and ground. Reverse the jumper wires at least two times.
  10. 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 harness connector at the Windshield Washer Pump.
    2. Test for infinite resistance between the Windshield Washer Pump control circuit terminals listed below and ground:
      • Control circuit terminal 1
      • Control circuit terminal 2
      • 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 control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, all OK.
    • Go to next step: If the G24 Windshield Washer Pump activates 
  11. Connect the X1 harness connector at the X50A Fuse Block - Underhood. Disconnect the X2 and X4 harness connectors at the K9 Body Control Module, ignition ON.
  12. 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 K9 Body Control Module control circuit terminals listed below and ground:
      • Control circuit terminal 9 X5
      • Control circuit terminal 14 X4
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, test or replace the X50A Fuse Block - Underhood.
    • Go to next step: If the G24 Windshield Washer Pump is not activated 
  13. Connect a 10 A fused jumper wire between the control circuit terminal 14 X4 and B+.
  14. 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 K9 Body Control Module control circuit terminal 14 X4 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 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 
  15. Connect a 10 A fused jumper wire between the control circuit terminal 9 X5 and B+.
  16. 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 X5 harness connector at the X50A Fuse Block - Underhood.
    2. Test for infinite resistance between the K9 Body Control Module control circuit terminal 9 X5 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 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 
  17. Replace the K9 Body Control Module.
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