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.

Circuit/System Description

The rear wiper is controlled based on an input from the rear wiper/washer switch. When the switch is in the ON or DELAY, a voltage signal is sent to the rear window wiper motor indicating the desired speed. Each switch position has resistor that drops the voltage to a specified value which is interpreted by the rear window wiper motor as ON or DELAY. The rear wiper motor receives B+ voltage from the I/P fuse block and accessory voltage from the body control system (BCM).

Reference Information

Schematic Reference

Wiper/Washer Schematics Electrical Diagrams

Connector End View Reference

Component Connector End Views A/C Compressor Clutch

Description and Operation

Wiper/Washer System Description and Operation (Wiper and Washers) Wiper/Washer System (Wipers and Washers)

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. Verify the front wipers operate in all modes.

• If the front wipers do not operate in all modes, refer to Windshield Wiper System Malfunction Windshield Wiper System Malfunction.

2. Press and release the rear window washer switch. The rear window wiper motor and pump should operate continuously for as long as the wash switch is pressed and several wipe cycles will occur after the switch is released.

• If the rear wiper motor and the rear washer pump are inoperative, refer to Rear Wiper Washer Switch Circuit Test.

• If the rear washer pump operates normal and the rear wiper motor is inoperative, refer to the Rear Wiper Motor Circuit Test.

• If the rear wiper motor operates and the rear washer pump is inoperative, refer to Washer Malfunction (Sedan) Washer Malfunction (Sedan)Washer Malfunction (Wagon) Washer Malfunction (Wagon).

Circuit/System Testing

Rear Wiper Washer Switch Circuit

1. Ignition OFF, disconnect the harness connector at the rear wiper motor.

2. Test for less than 5 ohms between ground terminal C and ground.

• If greater than the specified range, test the ground circuit for an open/high resistance.

3. Verify a test lamp illuminates between the B+ terminal E and ground.

• If test lamp does not illuminate, test the B+ circuit for a short to ground or open/high resistance.

4. Ignition ON, verify a test lamp illuminates between ignition circuit terminal B and ground.

• If test lamp does not illuminate, test the ignition circuit for a short to ground or open/high resistance.

5. Test for less that 1 V between signal circuit terminal A and ground.

• If greater than the specified voltage, test the signal circuit for a short to voltage.

6. Ignition OFF, connect the rear wiper motor connector. Disconnect the rear wiper switch connector.

7. Ignition ON, test for B+ between the signal circuit terminal 4 and ground.

• If less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If circuit tests normal, replace the rear window wiper motor.

8. Perform the Rear Window Wiper Switch Component Test.

• If the switch fails the component test, replace the switch.

9. If all circuits test normal, replace the rear wiper motor.

Rear Wiper Motor Circuit Test

1. Ignition OFF, disconnect the harness connector at the rear wiper motor.

2. Test for less than 5 ohms between ground terminal C and ground.

• If greater than the specified range, test the ground circuit for an open/high resistance.

3. Verify a test lamp illuminates between the B+ terminal E and ground.

• If test lamp does not illuminate, test the B+ circuit for a short to ground or open/high resistance.

4. Ignition ON, verify a test lamp illuminates between ignition circuit terminal B and ground.

• If test lamp does not illuminate, test the ignition circuit for a short to ground or open/high resistance.

5. If all circuits test normal, test or replace the rear wiper motor.

Component Testing

Rear Window Wiper Switch

1. Ignition OFF, disconnect the harness connector at the rear wiper switch.

2. Rear wiper switch in the WASH position, test for 5500-6750 ohms between the signal circuit terminal A and ground.

• If not within the specified range, test or replace the rear wiper washer switch.

3. Rear wiper switch in the DELAY position, test for 1500-2500 ohms between the signal circuit terminal A and ground.

• If not within the specified range, test or replace the rear wiper washer switch.

4. Rear wiper switch in the ON position, test for 600-675 ohms between the signal circuit terminal A and ground.

• If not within the specified range, test or replace the rear wiper washer switch.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Windshield Wiper and Washer Switch Replacement Service and Repair

* Rear Window Wiper Motor Replacement (Wagon) Rear Window Wiper Motor Replacement (Wagon)