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.
DTC Descriptors
DTC B3873 01
- Front Washer Relay Circuit Short to Battery
DTC B3873 02
- Front Washer Relay Circuit Short to Ground
DTC B3873 04
- Front Washer Relay Circuit Open Circuit
Diagnostic Fault Information
Circuit/System Description
The body control module (BCM) controls the windshield washer pump based on an input from the windshield wiper/washer switch. The BCM monitors the washer switch through the windshield washer switch signal circuit. When the washer 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 pump and the low speed wipers on.
Conditions for Running the DTC
* Ignition ON.
* The system voltage is between 9-16 V.
Conditions for Setting the DTC
* A short to ground or an open/high resistance is detected in the windshield washer relay control circuit.
* A short to voltage is detected in the windshield washer relay control circuit.
Action Taken When the DTC Sets
Washer operation is suspended.
Conditions for Clearing the DTC
A current DTC clears when the diagnostic runs and passes.
Reference Information
Schematic Reference
Wiper/Washer Schematics Electrical Diagrams
Connector End View Reference
Component Connector End Views Sunshade - Left
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.
2. Verify the scan tool Windshield Washer Switch parameter changes between Active and Inactive when pressing the windshield washer switch.
• If the parameter does not change
Refer to Circuit/System Testing - Windshield Wiper/Washer Switch Malfunction.
• If the parameter changes
3. Verify the scan tool Instrument Cluster Washer Fluid Level Switch parameter changes between Open when the fluid level is full and Closed when the fluid level is low.
• If the parameter does not change
Refer to Circuit/System Testing - Windshield Washer Fluid Level Switch Malfunction.
• If the parameter changes
4. Verify the Windshield Washers turn On when commanding the Windshield Washer Relay Active with a scan tool.
• If the Windshield Washers do not turn ON
Refer to Circuit/System Testing - Windshield Washer Pump Malfunction
• If the Windshield Washers turn ON
5. All OK.
Circuit/System Testing
Windshield Wiper/Washer Switch Malfunction
1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S82 Windshield Wiper/Washer Switch. It may take up to 11 min for all vehicle systems to power down.
2. Test for less than 5 ohms between the low reference circuit terminal 2 and ground.
• If 5 ohms or greater
1. Ignition OFF.
2. Test for less than 2 ohms in the low reference circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 Body Control Module.
• If less than 5 ohms
3. Ignition ON.
4. Verify the scan tool Windshield Washer Switch parameter is Inactive.
• If not Inactive
1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
2. Test for infinite resistance between the signal circuit terminal 5 and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the K9 Body Control Module.
• If Inactive
5. Install a 3 A fused jumper wire between the signal circuit terminal 5 and the low reference circuit terminal 2.
6. Verify the scan tool Windshield Washer Switch parameter is Active.
• If not Active
1. Ignition OFF, remove the jumper wire, disconnect the harness connector at the K9 Body Control Module, ignition ON.
2. Test for less than 1 V between the signal circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 Body Control Module.
• If Active
7. Test or replace the S82 Windshield Wiper/Washer Switch.
Windshield Washer Fluid Level Switch Malfunction
1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B118B Windshield Washer Fluid Level Switch. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal B and ground.
• If 10 ohms or greater
1. Ignition OFF.
2. Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 10 ohms
3. Ignition ON.
4. Verify the scan tool Washer Fluid Level Switch parameter is Open.
• If not Open
1. Ignition OFF, disconnect the harness connector at the P16 Instrument Cluster.
2. Test for infinite resistance between the signal circuit terminal A and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the P16 Instrument Cluster.
• If Open
5. Install a 3 A fused jumper wire between the signal circuit terminal A and the ground circuit terminal B.
6. Verify the scan tool Washer Fluid Level Switch parameter is Closed.
• If not Closed
1. Ignition OFF, remove the jumper wire, disconnect the harness connector at the P16 Instrument Cluster, ignition ON.
2. Test for less than 1 V between the signal circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the P16 Instrument Cluster.
• If Closed
7. Test or replace the B118B Windshield Washer Fluid Level Switch.
Windshield Washer Pump Malfunction
1. Ignition OFF, and all vehicle systems OFF. Disconnect the harness connector at the G24 Windshield Washer Pump. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 2 and ground.
• If 10 ohms or greater
1. Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 10 ohms
3. Connect a test lamp between the control circuit terminal 1 and the ground circuit terminal 2, ignition ON.
4. Verify the test lamp does NOT turn ON and OFF when commanding the Windshield Washer Relay Active and Inactive with a scan tool.
• If the test lamp turns ON and OFF
Test or replace the G24 Windshield Washer Pump.
• If the test lamp does not turn ON and OFF
5. Ignition OFF, connect the harness connector at the G24 Windshield Washer Pump. Disconnect the X1 harness connector at the X50A Fuse Block - Underhood, It may take up to 2 min for all vehicle systems to power down.
6. Test for less than 10 ohms between the ground circuit terminal 71 and ground.
• If 10 ohms or greater
1. Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 10 ohms
7. Ignition ON.
8. Verify the G24 Windshield Washer Pump is not activated.
• If the G24 Windshield Washer Pump is activated
1. Ignition OFF, disconnect the harness connector at the G24 Windshield Washer Pump, ignition ON.
2. Test for less than 1 V between the control circuit terminal 1 and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the G24 Windshield Washer Pump.
• If the G24 Windshield Washer Pump is not activated
9. Connect a 20 A fused jumper wire between the control circuit terminal 30 and B+.
10. Verify the G24 Windshield Washer Pump activates.
• If the G24 Windshield Washer Pump does not activate
1. Ignition OFF, remove the jumper wire, disconnect the harness connector at the G24 Windshield Washer Pump, ignition ON.
2. Test for infinite resistance between the control circuit and ground.
• If less than Infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the G24 Windshield Washer Pump.
• If the G24 Windshield Washer Pump activates
11. Ignition OFF, connect the X1 harness connector at the X50A Fuse Block - Underhood. Disconnect the X4 harness connector at the K9 Body Control Module, ignition ON.
12. Verify the G24 Windshield Washer Pump is not activated.
• If the G24 Windshield Washer Pump is activated
1. Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood, ignition ON.
2. Test for less than 1 V between the X2 harness connector at the X50A Fuse Block - Underhood control circuit terminal 60 and B+.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the X50A Fuse Block - Underhood.
• If the G24 Windshield Washer Pump is not activated
13. Connect a 10 A fused jumper wire between the control circuit terminal 14 and B+.
14. Verify the G24 Windshield Washer Pump activates.
• If the G24 Windshield Washer Pump does not activate
1. Ignition OFF, remove the jumper wire, disconnect the X2 harness connector at the X50A Fuse Block - Underhood.
2. Test for infinite resistance between the X2 harness connector at the X50A Fuse Block - Underhood control circuit terminal 60 and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If less than infinite resistance
3. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, test or replace the X50A Fuse Block - Underhood.
• If the G24 Windshield Washer Pump activates
15. Replace the K9 Body Control Module.
Component Testing
Windshield Wiper/Washer Switch
1. Ignition OFF, disconnect the harness connector at the S82 Windshield Wiper/Washer Switch.
2. Test for infinite resistance between the signal terminal 5 and the low reference terminal 2 with the switch in the open position.
• If less than infinite resistance
Replace the S82 Windshield Wiper/Washer Switch.
• If infinite resistance
3. Test for less than 2 ohms between the signal circuit terminal 5 and the low reference circuit terminal 2 with the switch in the closed position.
• If 2 ohms or greater
Replace the S82 Windshield Wiper/Washer Switch.
• If less than 2 ohms
4. All OK
Windshield Washer Fluid Level Switch
1. Ignition OFF, disconnect the harness connector at the B118B Windshield Washer Fluid Level Switch.
2. Test for infinite resistance between the signal circuit terminal A and the ground circuit terminal B with the switch in the open position.
• If less than infinite resistance
Replace the B118B Windshield Washer Fluid Level Switch.
• If infinite resistance
3. Test for less than 2 ohms between the signal circuit terminal A and the ground circuit terminal B with the switch in the closed position.
• If 2 ohms or greater
Replace the B118B Windshield Washer Fluid Level Switch.
• If less than 2 ohms
4. All OK
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Underhood Electrical Center or Junction Block Replacement Underhood Electrical Center or Junction Block Replacement
* Windshield Washer Pump Replacement Service and Repair
* Windshield Washer Solvent Level Sensor Replacement Service and Repair
* Windshield Wiper and Washer Switch Replacement Service and Repair
* Control Module References Control Module References for BCM and Instrument Cluster replacement and programming and setup