• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

For symptom byte information, refer to Symptom Byte List.

The windshield washer pump is controlled by the body control module (BCM) via a printed circuit board (PCB) relay. The BCM monitors the windshield wiper/washer switch signal circuit and when washer activation is requested, the BCM applies voltage through the window washer pump relay control circuit. With the relay energized, fused battery voltage is applied through the switch contacts of the relay and the windshield washer pump control circuit to activate the windshield washer pump.

• Ignition ON.
• The system voltage is between 9–16 V.

The body control module detects a short to B+ in the windshield washer pump relay control circuit.

The body control module detects a short to ground in the windshield washer pump relay control circuit.

The body control module detects an open or high resistance in the windshield washer pump relay control circuit.

Washer operation is suspended.

A current DTC clears when the diagnostic runs and passes.

Wiper/Washer Schematics

Master Electrical Component List

Wiper/Washer System Description and Operation

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Control Module References for scan tool information

1. Ignition ON.
2. Verify the G24 Windshield Washer Pump activates when commanding the Windshield Washer Relay On and Off with a scan tool.
• If the G24 Windshield Washer Pump does not activate

  Refer to Circuit/System Testing

• If the G24 Windshield Washer Pump activates
3. All OK.

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. 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.
• If less than 10 Ω
3. Connect the X1 harness connector at the X50A Fuse Block – Underhood and disconnect the X4 harness connector at the K9 Body Control Module, ignition ON.
4. 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 25 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.
• If the G24 Windshield Washer Pump is not activated
5. Connect a 10 A fused jumper wire between the control circuit terminal 14 X4 and B+.
6. 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 25 X2 and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• 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, replace the X50A Fuse Block – Underhood.
• If the G24 Windshield Washer Pump activates
7. Replace the K9 Body Control Module.

Perform the Diagnostic Repair Verification after completing the repair.

• Engine Wiring Harness Junction Block Replacement
• Control Module References for BCM replacement, programming and setup.