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.
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 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, 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.
3. Verify the windshield washer fluid level is above the minimum level.
• If not above the minimum level, fill the reservoir and inspect for leaks. If the low washer fluid indicator is still ON, refer to Low Washer Fluid Indicator Test.
Circuit/System Testing
Note:
You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
Windshield Washer Switch Circuit Test
1. Ignition OFF, disconnect the harness connector at the S82 windshield wiper/washer switch.
2. With RAP OFF, MDI disconnected, wait one minute, test for less that 5 ohms between the low reference terminal 2 and ground.
• If greater than the specified range, 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 ground. 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 60 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 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 2 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 1 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.
Low Washer Fluid Indicator Malfunction
1. Ignition OFF, disconnect the harness connector at the B118B windshield washer fluid level sensor.
2. Test for less than 5 ohms between the ground terminal B and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the scan tool Washer Fluid Level Switch parameter is OFF.
• If not the specified value, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the P16 instrument cluster.
4. Install a 3 A fused jumper wire between the signal circuit terminal A and ground. Verify the scan tool Washer Fluid Level Switch parameter is ON.
• 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 P16 instrument cluster.
5. If all circuits test normal, test or replace the B118B windshield washer fluid level sensor.
Component Testing
Washer Switch Test
1. Ignition OFF, disconnect the harness connector at the S82 windshield wiper/washer switch.
2. Test for less than 5 ohms between the signal circuit terminal 5 and ground.
• If not the specified value, replace the S82 windshield 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. Ignition ON, 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 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 ohms to infinite resistance while moving the level switch.
• If not the specified range, replace the B118B windshield washer fluid level sensor.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* 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, programming and setup