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 windshield 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.
Reference Information
Schematic Reference
Wiper/Washer Schematics Electrical Diagrams
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly - Primary
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, observe the scan tool Windshield Washer Switch parameter while pressing and releasing the washer switch. The reading should change between INACTIVE and ACTIVE.
• If the reading does not change between INACTIVE and ACTIVE, refer to Windshield Washer Switch Circuit Test.
2. Command the Windshield Washer Relay Command ON and OFF with a scan tool. The windshield washers should turn ON and OFF when changing between the commanded states.
• If windshield washers do not turn ON and OFF, refer to the Washer Pump Circuit Test.
Circuit/System Testing
Windshield Washer Switch Circuit Test
1. Ignition OFF, disconnect the harness connector at the S82 windshield wiper/washer switch.
2. Test for less than 5 ohms between the low reference terminal 2 and ground.
• If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K9 BCM.
3. Ignition ON, verify the scan tool Windshield Washer Switch parameter is INACTIVE.
• If not the specified value, test the signal circuit terminal 5 for a short to ground. If the circuit tests normal, replace the K9 BCM.
4. Install a 3 A fused jumper wire between the signal circuit terminal 5 and the ground circuit terminal 2. Verify the scan tool Windshield Washer Switch parameter is ACTIVE.
• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
5. If all circuits test normal, 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 21 and ground.
3. Ignition ON, command the Windshield Washer Relay Command ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
• If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
4. Ignition OFF, connect the X2 harness connector at the X50A underhood fuse block and disconnect the harness connector at the G24 windshield washer pump.
5. Test for less than 5 ohms between the ground circuit terminal B and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
6. Connect a test lamp between control circuit terminal A and ground.
7. Ignition ON, command the Windshield Washer Relay Command ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the X50A underhood fuse block.
• If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the X50A underhood fuse block.
8. If all circuits test normal, test or replace the G24 windshield washer pump.
Component Testing
Washer Switch Test
1. Disconnect the harness connector at the S82 windshield wiper/washer switch.
2. Test for less that 5 ohms between signal circuit terminal 5 and ground.
• If not the specified range, replace the S82 windshield wiper/washer switch.
Washer Pump Test
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 A and B+. Install a jumper wire between the ground terminal B 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.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Windshield Washer Pump Replacement Windshield Washer Pump Replacement
* Windshield Wiper and Washer Switch Replacement Service and Repair
* Control Module References Control Module References for BCM replacement, programming and setup