Circuit/System Testing

WARNING: This page is about a different car, the 2020 Buick Regal TourX, 2020 Buick Regal, 2019 Buick Regal TourX, and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.

Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module, ignition ON.
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.
2. Test for less than 1 V between the K9 Body Control Module control circuit terminal 14 X4 and ground.
  - 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
Connect a 3 A fused jumper wire between the control circuit terminal 14 and B+.
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, ignition ON.
2. Test for infinite resistance between the control 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 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
Replace the K9 Body Control Module.