Rear Washer System Malfunction
Rear 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
When the body control module (BCM) detects that the rear wiper/wash switch has activated the momentary wash switch, it activates a high side drive output which supplies battery to the coil of the rear washer pump relay. This energizes the relay, which switches battery power to the washer pump motor. The BCM will also activate continuous low speed windshield wipers as described above. This washer and wiper operation shall be continued so long as the switch remains active. Upon termination the rear wash motor will be deactivated and the wiper shall move to its park position and deactivate.
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
Operate the rear washers by using the S80 Window Wiper/Washer Switch. Verify the G24 Windshield Washer Pump activates.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the X50A Fuse Block - Underhood.
2. Disconnect the harness connector X5 at the K9 Body Control Module.
3. Test for less than 5 ohm between the control circuit terminal 6 K at the X50A Fuse Block - Underhood and the control circuit terminal 11 X5 at the K9 Body Control Module.
• If the value is not within the specified range, test the control circuit for a short to voltage or an open/high resistance.
• If the circuit tests normal, test or replace the K9 Body Control Module.
4. Test for infinite resistance between the control circuit terminal 6 K at the X50A Fuse Block - Underhood and ground.
• If the value is not within the specified range, test the control circuit for a short to ground.
5. Test for less than 5 ohm between the ground circuit terminal G 1 at the X50A Fuse Block - Underhood and ground.
• If the value is not within the specified range, test the ground circuit for a short to voltage or an open/high resistance.
6. If all circuits test normal, test or replace the X50A Fuse Block - Underhood.
7. Disconnect the harness connector X2 at the K9 Body Control Module and the harness connector X1 at the S80 Window Wiper/Washer Switch.
8. Test for less than 5 ohm between the signal circuit terminal 12 X2 at the K9 Body Control Module and the signal circuit terminal 4 X1 at the S80 Window Wiper/Washer Switch.
• If the value is not within the specified range, test the signal circuit for a short to voltage or an open/high resistance.
9. Test for infinite resistance between the signal circuit terminal 12 X2 at the K9 Body Control Module and ground.
• If the value is not within the specified range, test the control circuit for a short to ground.
• If the circuit tests normal, test or replace the S80 Window Wiper/Washer Switch.
10. Connect all connectors.
11. Disconnect the harness connector X1 at the G24 Windshield Washer Pump.
12. Test for less than 5 ohm between the ground circuit terminal A X1 at the G24 Windshield Washer Pump and ground.
• If the value is not within the specified range, test the ground circuit for a short to voltage or an open/high resistance.
• If the circuit tests normal, test or replace the K9 Body Control Module.
13. Install a test lamp between the control circuit terminal B X1 at the G24 Windshield Washer Pump and the ground circuit terminal A X1 at the G24 Windshield Washer Pump.
14. Ignition ON, activate the rear washer by using the S80 Window Wiper/Washer Switch. The test lamp should turn ON.
• If the test lamp is always OFF, test the control circuit for a short to ground or an open.
• If the test lamp is always ON, test the control circuit for a short to voltage.
15. If all circuits test normal, test or replace the G24 Windshield Washer Pump.
Component Testing
Multifunction Switch - Static Test
1. Ignition OFF, remove the S80 Window Wiper/Washer Switch.
2. Test for 5.90-6.30 kohm between signal terminal 2 and 4 at the S80 Window Wiper/Washer Switch while activating the rear wash switch.
• If the resistance is not within the specified range, replace the S80 Window Wiper/Washer Switch.
Washer Pump - Dynamic 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 B and 12 V. Install a jumper wire between the ground terminal A 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 diagnostic procedure.
* Control Module References (Programming and Relearning) for BCM replacement, setup, and programming
* Windshield Washer Pump Replacement (Equinox) (Service and Repair)Windshield Washer Pump Replacement (Terrain) (Service and Repair)
* Windshield Wiper and Washer Switch Replacement (Service and Repair)