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Washer Malfunction

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 has overviews of all diagnostic categories.


Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Windshield Washer Switch Signal

2

1

1

-

Washer Fluid Level Switch Signal

4

4

3

-

Windshield Washer Fluid Pump Control

1

1

2

-

Windshield Washer Relay Control

B3873 02

1

2

-

Windshield Washer Fluid Pump Ground

-

1

-

-

Washer Fluid Level Switch Ground

-

3

-

-

1. Front Washer Inoperative

2. Front Washer Always ON

3. Washer Fluid Level Indicator Inoperative

4. Washer Fluid Level Indicator Always ON



Circuit/System Description

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

On some vehicles warning information (wash fluid low) will be conveyed to the instrument panel. This instrument panel will provide visual feedback to the customer while in the RUN power mode.

Reference Information

Schematic Reference

Wiper/Washer Schematics

Connector End View Reference

Component Connector End Views

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 information on diagnostic tools

Circuit/System Verification


1. Ignition ON, observe the scan tool Windshield Washer Switch parameter while activating the S80 Window Wiper/Washer Switch. The parameter should change between Active and Inactive.

2. If the value does not change, refer to Multifunction Switch Malfunction.

3. Operate the windshield washer using the S80 Window Wiper/Washer Switch. Verify the G24 Windshield Washer Pump activates. Verify the washer fluid reservoir is filled up.

4. If the G24 Windshield Washer Pump does not run, refer to Washer Pump Malfunction.


Circuit/System Testing

Note

You must perform the circuit/system verification before proceeding with circuit/system testing.



Multifunction Switch Malfunction

1. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module.

2. Test for less than 5 Ω between the ground circuit terminal 10 and the signal circuit terminal 25 while activating the wash function.

3. If greater than the specified value, test the signal circuit and the ground circuit for open circuit/high resistance. If the circuit tests normal, replace the S80 Window Wiper/Washer Switch.

4. If all circuits test normal, test or replace the K9 Body Control Module.



Washer Pump Malfunction

1. Ignition OFF, disconnect the harness connector X1 at the G24 Windshield Washer Pump.

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

3. If greater than the specified range, test the ground circuit for an open/high resistance. If all circuits test normal, replace the X50A Fuse Block - Underhood.

4. Ignition ON, verify a test lamp does not illuminate between the control circuit terminal 1 and the ground circuit terminal 2.

5. If the test lamp illuminates, test the control circuit for a short to voltage.

6. Verify a test lamp illuminates between the control circuit terminal 1 and the ground circuit terminal 2 while activating the wash function.

7. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance.



Low Washer Fluid Indicator Malfunction

1. Verify the washer fluid reservoir is filled up.

2. Ignition OFF, disconnect the harness connector X1 at the B118 Windshield Washer Fluid Level Sensor.

3. Test for less than 5 Ω between the ground terminal B and ground.

4. If greater than the specified value, test the ground circuit for a short to voltage or an open/high resistance.

5. Ignition OFF, disconnect the harness connector X1 at the P16 Instrument Cluster.

6. Test for less than 5 Ω between the signal circuit terminal A at the B118B Windshield Washer Fluid Level Switch harness connector and signal terminal 15 at the P16 Instrument Cluster harness connector.

7. If greater than the specified value, test the signal circuit for a short to voltage or an open/high resistance.

8. Reconnect all harness connectors.

9. Ignition ON, command the Driver Information Center Segment test ON and OFF with the scan tool, verify that the low washer fluid indicator display reacts to ON and OFF positions.

10. If the low washer fluid indicator display stays always ON or always OFF, replace the P16 Instrument Cluster.

11. If the low washer fluid indicator display changes between ON and OFF, test or replace the B118B Windshield Washer Fluid Level Switch.


Component Testing

Multifunction Switch Malfunction

Ignition OFF, disconnect the Harness Connector at the S80 Window Wiper/Washer Switch. Test for less than 5 Ω between the Wiper/Washer Switch terminal 2 and 5 while activating the washer function.


Washer Pump Malfunction

1. Ignition OFF, disconnect the harness connector at the G24 Windshield Washer Pump.

2. Install a 10 A fused jumper wire between the control terminal 1 and 12 V. Install a jumper wire between the ground terminal 2 and ground.

3. Verify the G24 Windshield Washer Pump is activated.

4. If the G24 Windshield Washer Pump does not activate, replace the G24 Windshield Washer Pump.



Low Washer Fluid Indicator Malfunction

1. Ignition OFF, remove the B118 Windshield Washer Fluid Level Sensor.

2. Install a wire at terminal A and terminal B. Observe the resistance while moving the level switch.

3. The resistance should be changing between less than 5 Ω to infinite resistance while moving the level switch.

4. If not the specified range, replace the B118B Windshield Washer Fluid Level Switch.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Control Module References for information on BCM replacement, setup, and programming

• Windshield Wiper and Washer Switch Replacement

• Windshield Washer Pump Replacement (Sedan)

• Windshield Washer Solvent Level Sensor Replacement

• Front Compartment Fuse Block Housing Replacement