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 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. When this is the case, the BCM will command the windshield washer fluid pump and the low speed wipers on.
The intent of the heated washer fluid feature is to automatically clear the windshield of snow or ice upon activation. The system may also be used to improve the bug clearing performance of the wash feature under summer driving conditions.
On some vehicles warning information (wash fluid low ) will be conveyed via the GMLAN to the controls and displays subsystem (responsible for display). This subsystem will provide visual feedback to the customer while in the RUN power mode.
Reference Information
Schematic Reference
Wiper/Washer Schematics (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
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 (Programming and Relearning) for scan tool information
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.
• If the value does not change, refer to Multifunction Switch Malfunction.
2. 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.
• 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 ohm between the ground circuit terminal 10 and the signal circuit terminal 25 while activating the wash function.
• If greater than the specified value, test the signal circuit and the ground circuit for an open/high resistance. If the circuit tests normal, replace the S80 Window Wiper/Washer Switch.
3. 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. Ignition ON, verify a test lamp does not illuminate between the control circuit terminal 1 and the ground circuit terminal 2.
• If the test lamp illuminates, test the control circuit for a short to voltage.
3. Verify a test lamp illuminates between the control circuit terminal 1 and the ground circuit terminal 2 while activating the wash function.
• If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
4. Test for less than 5 ohm between the ground circuit terminal 2 and ground.
• If greater than the specified value, test the ground circuit for an short to voltage or an open/high resistance.
• If all circuits test normal, replace the X50A Fuse Block - Underhood.
Low Washer Fluid Indicator Malfunction
1. Verify the washer fluid reservoir is filled up.
2. Ignition OFF, disconnect the harness connector X1 at the B118B Windshield Washer Fluid Level Switch.
3. Test for less than 5 ohm between the ground terminal B and ground.
• If greater than the specified value, test the ground circuit for a short to voltage or an open/high resistance.
4. Ignition OFF, disconnect the harness connector X1 at the P16 Instrument Cluster.
5. Test for less than 5 ohm 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.
• If greater than the specified value, test the signal circuit for a short to voltage or an open/high resistance.
6. Reconnect all harness connectors.
7. 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.
• If the low washer fluid indicator display stays always ON or always OFF, replace the P16 Instrument Cluster.
8. 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
1. Ignition OFF, disconnect the Harness Connector at the S80 Window Wiper/Washer Switch. Test for less than 5 ohm between the Wiper/Washer Switch terminal 2 and 5 while activating the washer function.
• If not the specified value, replace the S80 Window Wiper/Washer Switch.
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.
• 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 B118B Windshield Washer Fluid Level Switch.
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 ohm to infinite resistance while moving the level switch.
• If not the specified range, replace the B118B Windshield Washer Fluid Level Switch.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Windshield Wiper and Washer Switch Replacement (Service and Repair)
* Windshield Washer Pump Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for BCM replacement, setup, and programming