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Washer Malfunction




Washer Malfunction

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information






Circuit/System Description

The body control module (BCM) controls the windshield washer fluid pump based on an input from the windshield wiper/washer switch. The BCM monitors the washer switch through the windshield washer switch signal circuit. When the washer switch is closed, ground is supplied to the windshield washer switch signal circuit. When this is the case, the BCM will command the windshield washer fluid pump and the low speed wipers on.

Reference Information

Schematic Reference

Wiper/Washer Schematics Electrical Diagrams

Connector End View Reference

Component Connector End Views Fuel Pump and Level Sensor Assembly

Description and Operation

Wiper/Washer System Description and Operation Description and Operation

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References 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 the windshield washer switch is pressed and released.

• If the parameter does not change
Refer to Circuit/System Testing - Windshield Wiper/Washer Switch Circuit Test.

• If the parameter changes

3. Verify the washer turns on and off when the Windshield Washer Relay is commanded On and Off with a scan tool.

• If the washers do not turn on and off
Refer to Circuit/System Testing - Washer Pump Circuit Test.

• If the washers turn on and off

4. Verify the scan tool Washer Fluid Level Switch parameter changes between On and Off when filling or depleting the windshield washer reservoir.

• If the parameter does not change
Refer to Circuit/System Testing - Low Washer Fluid Indication Malfunction.

• If the parameter changes

5. All OK.

Circuit/System Testing

Windshield Wiper/Washer Switch Circuit Test

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S82 windshield wiper/washer switch. It may take up to 2 minutes for all vehicle systems to power down.

2. Test for less than 10 ohms between the low reference circuit terminal 2 and ground.

• If 10 ohms or greater

1. Ignition OFF, disconnect the harness connector at the K9 body control module.

2. Test for less than 2 ohms in the low reference circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K9 body control module.

• If less than 10 ohms

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.

• 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, 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.

• If less than 1 V

3. Test for less than 2 ohms in the signal circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K9 body control module.

• If Active

7. Test or replace the S82 windshield wiper/washer switch.

Washer Pump Circuit Test

1. Ignition OFF, disconnect the X2 harness connector at the X50A underhood fuse block.

2. Connect a test lamp between the control circuit terminal 60 and ground, ignition ON.

3. 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, disconnect the harness connector at the K9 body control module, 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.

• If infinite resistance

3. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K9 body control module.

• If the test lamp is always ON

1. Ignition OFF, disconnect the 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.

• If the test lamp turns ON and OFF

4. Ignition OFF and all vehicle systems OFF, connect the X2 harness connector at the X50A underhood fuse block. Disconnect the harness connector at the G24 windshield washer pump. It may take up to 2 minutes for all vehicle systems to power down.

5. Test for less than 10 ohms between the ground circuit terminal 2 and ground.

• If 10 ohms or greater

1. Ignition OFF.

2. Test for less than 2 ohms in the ground circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, repair the open/high resistance in the ground connection.

• If less than 10 ohms

6. Connect a test lamp between the control circuit terminal 1 and ground.

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

• If the test lamp is always OFF and the circuit fuse is good

1. Ignition OFF, disconnect the X1 harness connector at the X50A underhood fuse block.

2. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the X50A underhood fuse block.

• If the test lamp is always OFF and the circuit fuse is open

1. Ignition OFF.

2. Test for infinite resistance between the control circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance, replace the X50A underhood fuse block.

• If the test lamp is always ON

1. Ignition OFF, disconnect the X1 harness connector at the X50A underhood fuse block.

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 X50A underhood fuse block.

• If the test lamp turns ON and OFF

8. Test or replace the G24 windshield washer pump.

Low Washer Fluid Indication Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B118B windshield washer fluid level switch. It may take up to 2 minutes for all vehicle systems to power down.

2. Test for less than 10 ohms between the ground circuit terminal B and ground.

• If 10 ohms or greater

1. Ignition OFF.

2. Test for less than 2 ohms in the ground circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, repair the open/high resistance in the ground connection.

• If less than 10 ohms

3. Ignition ON.

4. Verify the scan tool Washer Fluid Level Switch parameter is Off.

• If not Off

1. Ignition OFF, disconnect the harness connector at the P16 instrument cluster.

2. Test for infinite resistance between the signal circuit terminal A and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance, replace the P16 instrument cluster.

• If Off

5. Install a 3 A fused jumper wire between the signal circuit terminal A and the ground circuit terminal B.

6. Verify the scan tool Washer Fluid Level Switch parameter is On.

• If not On

1. Ignition OFF, disconnect the harness connector at the P16 instrument cluster, 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.

• If less than 1 V

3. Test for less than 2 ohms in the signal circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the P16 instrument cluster.

• If On

7. Test or replace the B118B windshield washer fluid level switch.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Windshield Washer Pump Replacement Windshield Washer Pump Replacement

* Accessory Wiring Junction Block Replacement Removal and Replacement

* Windshield Wiper and Washer Switch Replacement Service and Repair

* Control Module References Control Module References for BCM and instrument cluster replacement and programming and setup

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