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Rear Wiper System Malfunction

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    • Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Wiper Switch Ignition Supply

1

1

--

--

Rear Wiper Motor Control

1

3

2

--

Rear Wiper Motor Ground

--

1

--

--

1. Wiper Inoperative All Modes

2. Wiper Always On

3. Low Speed Modes Inoperative

Circuit/System Description

The rear wiper motor operation is controlled by supplying ignition voltage through the wiper switch to the rear wiper motor control circuits. Ignition voltage is supplied though the WIPER, REAR fuse. The rear wiper motor uses the ignition voltage circuit to supply power to the motor after the switch is turned off to park the rear wiper.

Reference Information

Schematic Reference

Wiper/Washer Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Wiper/Washer System Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Circuit/System Verification
  1. Ignition ON, Verify that the front windscreen wipers operate.
    2. ⇒If the front windscreen wipers do not operate, refer to Windscreen Wiper System Malfunction .
  2. Verify the rear window wiper operates.
    3. ⇒If the rear window wiper does not operate, refer to Rear Wiper Malfunction.
  3. Verify the rear window wiper parks.
    4. ⇒If the rear window wiper does not park, refer to Rear Wiper Malfunction.

Circuit/System Testing

Rear Wiper Malfunction

  1. Ignition OFF, disconnect the wiring harness plug at the windscreen wiper/washer switch.
  2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 3 and ground.
    3. ⇒If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  3. Ignition OFF, connect the harness at the windscreen wiper/washer switch. Disconnect the wiring harness plug at the rear window wiper motor.
  4. Test for less than 1 Ω between the ground circuit terminal 1 and ground.
    5. ⇒If greater than the specified range, test the ground circuit for an open/high resistance.
  5. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 3 and ground.
    6. ⇒If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  6. Place the rear wiper switch in the ON position, verify that a test lamp illuminates between the control circuit terminal 2 and ground.
    7. ⇒If the test lamp does not illuminate, test the control circuit for an open/high resistance. If the circuit tests normal replace the wiper switch.
  7. If all circuits test normal replace the rear window wiper motor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Windscreen Wiper and Washer Switch Replacement
    •  Rear Window Wiper Motor Replacement
   


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