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Rear Wiper System Malfunction




Rear 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.

Diagnostic Fault Information






Circuit/System Description

The body control module (BCM) controls the single speed rear wiper motor by its active high output to the external rear wiper motor relay. When the BCM activates its output and applies battery to the coil of the relay, the relay energizes, allowing battery voltage from the fuse to be applied through the switched contacts of the rear wiper motor relay to the control input of the rear wiper motor. The motor then operates continuously at low speed.

Reference Information

Schematic Reference

Wiper/Washer Schematics Electrical Diagrams

Connector End View Reference

Component Connector End Views Sunshade - Left Front

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 DTC B370B is not set.

• If DTC B370B is set
Refer to DTC B370B B370B

• If DTC B370B is not set

3. S78 turn signal/multifunction switch in rear wiper ON position.

4. Verify rear wipers ON.

• If wipers not ON

1. Verify the scan tool Rear Wiper Switch parameter is Active when operating the rear wipers.

• If the parameter is not Active, refer to Rear Wiper/Washer Switch Circuit Test.

• If the parameter is Active

2. Verify the solenoid in the relays listed below turn on and off/clicks when commanding the Windshield Wipers ON and OFF with a scan tool.

• If the solenoid does not turn on and off/clicks, refer to Rear Wiper Relay Control Circuit Test.

• If the solenoid does turn on and off/clicks, refer to Rear Wiper Motor Circuit Test.

• If wipers ON

5. All OK.

Circuit/System Testing

Rear Wiper/Washer Switch Circuit Test

1. Ignition OFF and all vehicle systems OFF. Disconnect the harness connector at the S82 Windshield Wiper/Washer Switch. It may take up to 2 minutes for all vehicle systems to power down.

2. Test for less than 2 ohms between the low reference circuit terminal 2 at the S82 Windshield Wiper/Washer Switch and ground.

• If greater than 10 ohms

1. Test for less than 2 ohms in the ground circuit end to end.

• If greater than 2 ohms, 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. Test for 11-13 V between the signal circuit terminal 4 at the S82 Windshield Wiper/Washer Switch and ground.

• If less than 11 V

1. Ignition OFF, disconnect the X2 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 in 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 greater than 13 V

1. Ignition OFF, 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 greater than 1 V, repair the short to voltage on the circuit.

• If less than 1 V, replace the K9 body control module.

• If between 11-13 V

5. Test or replace the S82 Windshield Wiper/Washer Switch.

Rear Wiper Motor Circuit Test

1. Ignition OFF and all vehicle systems OFF, disconnect the X2 harness connector at the M45 rear wiper motor. It may take up to 2 minutes for all vehicle systems to power down.

2. Disconnect the harness connector at the M45 rear wiper motor.

3. Test for less than 10 ohms between the ground circuit terminal 3 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

4. Disconnect the harness connector at the M45 rear wiper motor.

5. Test for less than 10 ohms between the ground circuit terminal 3 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

6. Ignition ON.

7. Verify a test lamp illuminates between the rear wiper motor B+ circuit terminal 2 and ground.

• If the test lamp does not illuminate and the circuit fuse is good

1. Ignition OFF.

2. Test for less than 2 ohms in the B+ circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If there is voltage at the fuse, replace the X50A underhood fuse block.

• If the test lamp does not illuminate and the circuit fuse is open

1. Ignition OFF, test for infinite resistance between the B+ circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance

2. Test for less than 2 ohms between the B+ circuit and ground.

• If , 2 ohms or greater, repair the open/high resistance in the circuit.

• If infinite resistance, test or replace the X50A underhood fuse block.

• If the test lamp illuminates

8. Connect a test lamp between the control circuit terminal 4 and the ground circuit terminal 3.

9. Verify the test lamp turns ON and OFF when commanding the rear wipers ON and OFF using the S78 turn signal/multifunction switch.

• If the test lamp is always OFF

1. Ignition OFF, 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

2. 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 underhood fuse block.

• If the test lamp is always ON

1. Ignition OFF, 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 X50A underhood fuse block.

• If the test lamp turns ON and OFF

10. Test or replace the M45 rear wiper motor.

Rear Wiper Relay Circuit Test

1. Ignition OFF and all vehicle systems OFF. Disconnect the X2 harness connector at the X50A underhood fuse block. It may take up to 2 minutes for all vehicle systems to power down.

2. Test for less than 2 ohms between the low reference circuit terminal B5 at the S82 Windshield Wiper/Washer Switch and ground.

• If greater than 10 ohms

1. Test for less than 2 ohms in the ground circuit end to end.

• If greater than 2 ohms, 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. Connect a test lamp between the control circuit terminal C5 and the ground circuit terminal B5.

5. Verify the test lamp turns ON and OFF when commanding the rear wipers ON and OFF using the S78 turn signal/multifunction switch.

• If the test lamp is always OFF

1. Ignition OFF, 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

2. 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, 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

6. Test or replace the X50A underhood fuse block.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Rear Window Wiper Motor Replacement (Equinox) Rear Window Wiper Motor Replacement (Equinox)Rear Window Wiper Motor Replacement (Terrain) Rear Window Wiper Motor Replacement (Terrain)

* Windshield Wiper and Washer Switch Replacement Service and Repair

* Control Module References Control Module References or BCM replacement, programming and setup

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