Buick Regal: Washer Malfunction

Diagnostic Instructions

• 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.

Diagnostic Fault Information

Circuit/System Description

The windshield washer pump is controlled by the body control module (BCM) via a removable relay. When the washer switch is depressed, the BCM monitors the signal circuit by the washer request circuit. The BCM then applies voltage through a control circuit to the removable windshield washer pump relay. With the relay energized, fused battery voltage is applied through the switch contacts of the relay and the control circuit to activate the windshield washer pump.

Reference Information

Schematic Reference

Wiper/Washer Wiring Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Wiper/Washer System Description and Operation

Electrical Information Reference

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

Scan Tool Reference

Control Module References for scan tool information.

Circuit/System Verification

1. Ignition ON.

2. Verify the scan tool Windshield Washer Switch parameter changes between Active and Inactive when pressing the windshield washer switch.

• If the parameter does not change

Refer to Circuit/System Testing - Windshield Wiper/Washer Switch Malfunction.

• Go to next step: If the parameter changes

3. Verify the Windshield Washers turn On when commanding the Windshield Washer Relay Active with a scan tool.

• If the Windshield Washers do not turn ON

Refer to Circuit/System Testing - Windshield Washer Pump Malfunction

• Go to next step: If the Windshield Washers turn ON

4. All OK.

Circuit/System Testing

Windshield Wiper/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 min for all vehicle systems to power down.

2. Test for less than 5 Ω between the low reference circuit terminal 2 and ground.

• If 5 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 5 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 KR11 Windshield Washer Pump Relay. It may take up to 2 min for all vehicle systems to power down.

2. Test for less than 10 Ω between the ground circuit terminal 85 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. Ignition ON.

4. Verify a test lamp illuminates between the B+ circuit terminal 87 and ground.

• If the test lamp does not illuminate

Replace the X50 Fuse Block-Underhood.

• Go to next step: If the test lamp illuminates

5. Connect a test lamp between the control circuit terminal 86 and the ground circuit terminal 85.

6. Verify the test lamp turns ON and OFF when commanding the Windshield Washer Relay On and Off with a scan tool.

• If the test lamp is always OFF

1. Ignition OFF, remove the test lamp, disconnect the X4 harness connector at the K9 Body Control Module.
2. Test for infinite resistance between the 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, replace the K9 Body Control Module.

• If the test lamp is always ON

1. Ignition OFF, remove the test lamp, disconnect the X4 harness connector at the K9 Body Control Module, ignition ON.
2. Test for less than 1 V between the control circuit and ground.
   • If 1 V or greater, repair the short to voltage on the circuit.
   • If less than 1 V, replace the K9 Body Control Module.

• Go to next step: If the test lamp turns ON and OFF

7. Verify that a test lamp does not illuminate between the control circuit terminal 87 and ground.

• If the test lamp illuminates

Repair the short to voltage on the control circuit

• Go to next step: If the test lamp does not illuminate

8. Ignition OFF and all vehicle systems OFF, remove the test lamp, disconnect the harness connector at the G24 Windshield Washer Pump. It may take up to 2 min for all vehicle systems to power down.

9. Test for less than 10 Ω between the ground circuit terminal 2 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

10. Connect the harness connector at the G24 Windshield Washer Pump.

11. Ignition ON, connect a 3 A fused jumper wire between the B+ circuit terminal 87 and the control circuit terminal 30.

12. Verify the G24 Windshield Washer Pump is activated.

• If the G24 Windshield Washer Pump does not activate

1. Ignition OFF, remove the jumper wire, disconnect the harness connector at the G24 Windshield Washer Pump.
2. Test for infinite resistance between the control circuit terminal 1 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 G24 Windshield Washer Pump.

• Go to next step: If the G24 Windshield Washer Pump activates

13. Test or replace the KR11 Windshield Washer Pump Relay.

Component Testing

Windshield Wiper/Washer Switch

1. Ignition OFF, disconnect the harness connector at the S82 Windshield Wiper/Washer Switch.

2. Test for infinite resistance between the signal terminal 5 and the low reference terminal 2 with the switch in the open position.

• If less than infinite resistance

Replace the S82 Windshield Wiper/Washer Switch.

• Go to next step: If infinite resistance

3. Test for less than 2 Ω between the signal circuit terminal 5 and the low reference circuit terminal 2 with the switch in the closed position.

• If 2 Ω or greater

Replace the S82 Windshield Wiper/Washer Switch.

• Go to next step: If less than 2 Ω

4. All OK

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Engine Wiring Harness Junction Block Replacement (LTG) Engine Wiring Harness Junction Block Replacement (LGX)
• Windshield Washer Pump Replacement
• Windshield Washer Solvent Container Level Sensor Replacement
• Windshield Wiper and Washer Switch Replacement
• Control Module References for BCM and Instrument Cluster replacement, programming, and setup

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