Windshield Wiper Washer System Malfunction
Windshield Wiper Washer System 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 washer motor based on an input from the windshield washer switch, a part of the multifunction switch. The BCM monitors the washer switch through the windshield washer pump control circuit. When the WASH switch is closed, accessory voltage is supplied to the BCM which 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 Connector End Views By Name
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, wiper switch in the OFF position, observe the scan tool Windshield Washer Switch parameter while cycling the WASH switch ON and OFF. The parameter should cycle between Active and Inactive.
• If the parameter does not cycle between the specified values, refer to Windshield Wiper/Washer Switch Circuit Malfunction.
2. Operate the washers using the WASH switch. Verify the washer pump activates and the low speed wipers turn on.
• If the washer pump does not activate, refer to Washer Pump Circuit Malfunction.
• If the low speed wipers do not turn on, refer to Windshield Wiper System Malfunction Windshield Wiper System Malfunction.
Circuit/System Testing
Windshield Wiper/Washer Switch Circuit Malfunction
1. Ignition OFF, disconnect the X1 harness connector at the multifunction switch.
2. Test for less than 20 ohm between the low reference circuit terminal 7 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the scan tool Windshield Washer Switch parameter is Inactive.
• If not the specified value, test the control circuit terminal 6 (with WA9) or terminal 8 (without WA9) for a short to B+. If the circuit tests normal, replace the BCM.
4. Install a 3 A fused jumper wire between the control circuit terminal 6 (with WA9) or terminal 8 (without WA9) and B+. Verify the scan tool Windshield Washer Switch parameter is Active.
• If not the specified value, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
5. If all circuits test normal, test or replace the multifunction switch.
Washer Pump Circuit Malfunction
1. Ignition OFF, Disconnect harness connector at Windshield Washer Fluid Pump.
2. Ignition ON, test for B+ at control circuit terminal A of Windshield Washer Fluid Pump connector while activating washers.
• If not the specified value, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
3. Install a test light between control circuit terminal A and ground circuit terminal B at the windshield washer fluid pump connector
4. The test lamp should turn ON and OFF when the windshield washers are commanded ON and OFF.
• If not the specified value, test the ground circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
Component Testing
Multifunction Switch
1. With the WASH switch in the open position, test for infinite resistance between the Accessory Voltage terminal 7 and the control terminal 6 (with WA9) or terminal 8 (without WA9).
• If not the specified value, replace the multifunction switch.
2. With the WASH switch in the closed position, test for less than 2 ohm between the Accessory Voltage terminal 7 and the control terminal 6 (with WA9) or terminal 8 (without WA9).
• If greater than the specified range, replace the multifunction switch.
Washer Pump
1. Ignition OFF, disconnect the harness connector at the washer pump.
2. Install a 10 A fused jumper wire between the control terminal A and 12 V. Install a jumper wire between the ground terminal B and ground.
3. Verify the washer pump is activated.
• If the washer pump does not activate, replace the washer pump.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Control Module References Programming and Relearning for BCM replacement, setup, and programming
* Turn Signal Multifunction Switch Replacement Turn Signal Multifunction Switch Replacement
* Washer Pump Replacement Service and Repair