Windshield Wiper System Malfunction
Windshield Wiper 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.
DTC Descriptors
DTC B3715 01
- Windshield Wiper Relay Circuit Short to Battery
DTC B3715 02
- Windshield Wiper Relay Circuit Short to Ground
DTC B3715 04
- Windshield Wiper Relay Circuit Open
DTC B3875 01
- Windshield Wiper High Speed Relay Circuit Short to Battery
DTC B3875 02
- Windshield Wiper High Speed Relay Circuit Short to Ground
DTC B3875 04
- Windshield Wiper High Speed Relay Circuit Open
Diagnostic Fault Information
Circuit/System Description
The body control module (BCM) controls the wiper motor based on input from the windshield wiper/washer switch. The BCM monitors the wiper/washer switch through two separate signal circuits and a low reference circuit. The windshield wiper switch high signal circuit is used to determine high speed wiper operation, the windshield wiper switch low signal is used to determine low speed, intermittent, and mist operation through the use of a resistor ladder, and the windshield washer switch signal circuit is used to determine washer operation.
The BCM controls the windshield wiper motor through two output controls, controlling two relays which determine the desired wiper speed, high or low.
Conditions for Running the DTC
* The DTC runs only when a wiper output is actively being requested by the BCM.
* The system voltage is between 9-16 V.
Conditions for Setting the DTC
* A short to ground is detected in the front wiper relay control circuit or in the high speed relay control circuit.
* A short to voltage or an open/high resistance is detected in the front wiper relay control circuit or in the high speed relay control circuit.
Action Taken When the DTC Sets
The BCM will not activate the wiper output.
Conditions for Clearing the DTC
* A current DTC will clear when the condition for setting the fault is no longer present.
* A history DTC will clear after 50 consecutive ignition cycles without a fault present.
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 Wiper High Speed Switch parameter changes between Active and Inactive when activating the high speed windshield wipers.
• 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 Windshield Wiper Switch parameter changes between Off and Low when activating the low speed windshield wipers.
• If the parameter does not change
Refer to Circuit/System Testing - Windshield Wiper/Washer Switch Malfunction.
• If the parameter changes
4. Verify the scan tool Windshield Wiper Switch parameter changes between Delay 1 and Delay 5 when cycling the intermittent speed windshield wipers.
• If the parameter does not change
Test or replace the S82 Windsheild Wiper/Washer Switch.
• If the parameter changes
5. Verify the M75 Windshield Wiper Motor changes between Off, Low, and High when cycling the S82 Windshield Wiper/Washer Switch between Off, Low, and High.
• If the Windshield Wiper Motor does not cycle between Off, Low, and High
Refer to Circuit/System Testing - Windshield Wiper Motor Malfunction
• If the Windshield Wiper Motor cycles between Off, Low, and High
6. Ignition OFF.
7. Verify the scan tool Windshield Wiper Park Switch parameter is Active.
• If the parameter does not change
Refer to Circuit/System Testing - Windshield Wiper Motor Malfunction.
• If the parameter changes
8. 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 10 ohms between the low reference circuit terminal 2 and ground.
• If 10 ohms or greater
1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
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 10 ohms
3. Ignition ON.
4. Verify the scan tool Windshield Wiper High Speed 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 1 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 1 and the low reference circuit terminal 2.
6. Verify the scan tool Windshield Wiper High Speed 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 for greater than 8 V between the signal circuit terminal 3 and ground.
• If less than 8 V
1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
2. Test for infinite resistance between the signal 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 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 8 V or greater
8. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module, ignition ON.
9. Test for less than 1 V between the S82 Windshield Wiper/Washer Switch signal circuit terminal 3 and ground.
• If 1 V or greater
Repair the short to voltage on the circuit.
• If less than 1 V
10. Test or replace the S82 Windshield Wiper/Washer Switch.
Windshield Wiper Motor Malfunction
1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the M75 Windshield Wiper Motor. 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 D 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 Windshield Wiper Park 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 C 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 C and the ground circuit terminal D.
6. Verify the scan tool Windshield Wiper Park 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. Ignition OFF and all vehicle systems OFF, disconnect the KR12B Windshield Wiper Relay. It may take up to 2 min for all vehicle systems to power down.
8. Test for less than 10 ohms between the ground circuit terminals listed below and ground.
* terminal 85
* terminal 87A
• 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
9. Ignition ON.
10. Verify a test lamp illuminates between the B+ circuit terminal 87 and the ground circuit terminal 87A.
• If the test lamp does not illuminate and the circuit fuse is good
Replace the X50A Fuse Block - Underhood.
• If the test lamp does not illuminate and the circuit fuse is open
1. Ignition OFF, remove the test lamp. Disconnect the KR12C Windshield Wiper Speed Control Relay.
2. Test for infinite resistance between the control circuits listed below and gound.
* Terminal 87A
* Terminal 87
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the M75 Windshield Wiper Motor
• If the test lamp illuminates
11. Connect a test lamp between the control circuit terminal 86 and the ground circuit terminal 85.
12. Verify the test lamp turns ON and OFF when commanding the Windshield Wiper Motor Relay Low and Off with a scan tool.
• If the test lamp is always OFF
1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module.
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 K9 Body Control Module.
• If the test lamp is always ON
1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module, ignition ON.
2. Test for less than 1 V between the control circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K9 Body Control Module.
• If the test lamp turns ON and OFF
13. Ignition OFF, connect the KR12B Windshield Wiper Relay and disconnect the KR12C Windshield Wiper Speed Control Relay, ignition ON.
14. Test for less than 10 ohms between the control circuit terminal 30 and ground.
• If 10 ohms or greater
Test or replace the KR12B Windshield Wiper Relay.
• If less than 10 ohms
15. Connect a test lamp between the control circuit terminal 30 and ground.
16. Verify the test lamp turns ON and OFF when commanding the Windshield Wiper Motor Relay Low and Off with a scan tool.
• If the test lamp does not turn ON and OFF
Test or replace the KR12B Windshield Wiper Relay.
• If the test lamp turns ON and OFF
17. Verify a test lamp illuminates between the B+ circuit terminal 85 and ground.
• If the test lamp does not illuminate
Replace the X50A Fuse Block - Underhood.
• If the test lamp illuminates
18. Connect a test lamp between the B+ circuit terminal 85 and the control circuit terminal 86.
19. Verify the test lamp turns ON and OFF when commanding the Windshield Wiper High Speed Relay High and Off with a scan tool.
• If the test lamp is always OFF
1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module, ignition ON.
2. Test for less than 1 V between the control circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V
3. Ignition OFF.
4. 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 K9 Body Control Module.
• If the test lamp is always ON
1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module.
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, replace the K9 Body Control Module.
• If the test lamp turns ON and OFF
20. Ignition OFF, connect the KR12C Windshield Wiper Speed Control Relay.
21. Connect a test lamp between the M75 Windshield Wiper Motor control circuit terminal B and ground circuit terminal D, ignition ON.
22. Verify the test lamp turns ON and OFF when commanding the Windshield Wiper Motor Relay Low and Off with a scan tool.
• If the test lamp is always OFF
1. Ignition OFF, remove the test lamp, disconnect the KR12C Windshield Wiper Speed Control Relay.
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, test or replace the KR12C Windshield Wiper Speed Control Relay.
• If the test lamp is always ON
1. Ignition OFF, remove the test lamp, disconnect the KR12C Windshield Wiper Speed Control Relay, ignition ON.
2. Test for less than 1 V between the control circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, test or replace the KR12C Windshield Wiper Speed Control Relay.
• If the test lamp turns ON and OFF
23. Connect a test lamp between the M75 Windshield Wiper Motor control circuit terminal A and ground circuit terminal D, ignition ON.
24. Verify the test lamp turns ON and OFF when commanding the Windshield Wiper High Speed Relay High and Off with a scan tool.
• If the test lamp is always OFF
1. Ignition OFF, remove the test lamp, disconnect the KR12C Windshield Wiper Speed Control Relay.
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, test or replace the KR12C Windshield Wiper Speed Control Relay.
• If the test lamp is always ON
1. Ignition OFF, remove the test lamp, disconnect the KR12C Windshield Wiper Speed Control Relay, ignition ON.
2. Test for less than 1 V between the control circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, test or replace the KR12C Windshield Wiper Speed Control Relay.
• If the test lamp turns ON and OFF
25. Test or replace the M75 Windshield Wiper Motor.
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 1 and the low reference terminal 2 with the high speed 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 1 and the low reference circuit terminal 2 with the high speed switch in the closed position.
• If 2 ohms or greater
Replace the S82 Windshield Wiper/Washer Switch.
• If less than 2 ohms
4. Test for infinite resistance between the signal terminal 3 and the low reference terminal 2 with the low speed switch in the open position.
• If less than infinite resistance
Replace the S82 Windshield Wiper/Washer Switch.
• If infinite resistance
5. Test for the resistance values listed below between the signal circuit terminal 3 and the low reference circuit terminal 2 by cycling the switch between Delay 1 and Delay 5.
* Delay 1 : 3.8kohms
* Delay 2 : 2.8kohms
* Delay 3 : 1.9kohms
* Delay 4 : 2.8kohms
* Delay 5 : 770ohms
• If not within the resistance values listed
Replace the S82 Windshield Wiper/Washer Switch.
• If within the resistance values listed
6. All OK
Relay Test
1. Ignition OFF, disconnect the appropriate relay.
2. Test for 60-200 ohms between terminals 85 and 86.
• If less than 60 or greater than 200
Replace the relay.
• If between 60-200 ohms
3. Test for infinite resistance between the terminals listed below:
* 30 and 86
* 30 and 87
* 30 and 85
* 85 and 87
• If less than infinite resistance
Replace the relay.
• If infinite resistance
4. Test for less than 5 ohms between terminals 30 and 87A.
• If 5 ohms or greater
Replace the relay.
• If less than 5 ohms
5. Install a 10 A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground.
6. Test for less than 5 ohms between terminals 30 and 87.
• If 5 ohms or greater
Replace the relay.
• If less than 5 ohms
7. All OK
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Windshield Wiper Motor Replacement Service and Repair
* Relay Replacement (Within an Electrical Center) Relay Replacement (Within an Electrical Center)Relay Replacement (Attached to Wire Harness) Relay Replacement (Attached to Wire Harness)
* Windshield Wiper and Washer Switch Replacement Service and Repair
* Control Module References Control Module References for BCM replacement, setup, and programming