Wipers and Washers

DTC B1017 or B3970

Diagnostic Instructions

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

DTC Descriptor

DTC B1017
- Output Driver Module Performance

Circuit/System Description

The rear wiper motor is supplied battery positive voltage and ground. The liftgate control module controls rear wiper motor operation through the rear wiper motor speed signal circuit. The rear wiper motor speed signal circuit is supplied a battery positive reference voltage by the rear wiper motor module and is pulse width modulated to ground by the liftgate control module. The duty cycle of the pulse width modulation (PWM) determines the rear wiper motor operating mode.

Conditions for Running the DTC

The battery voltage must be between 9-16 volts.

Conditions for Setting the DTC

The rear wiper motor speed signal circuit is open or shorted to ground.

Action Taken When the DTC Sets

The rear wiper/washer system will be disabled for as long as the DTC is current.

Conditions for Clearing the DTC

* This DTC will clear on current status after the condition for setting the fault is corrected and the ignition is cycled.
* A history DTC will clear after 100 consecutive ignition cycles without a fault present.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the rear window wiper motor.
2. Test for less than 1.0 ohm of resistance between the ground circuit terminal A and ground.

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

3. Verify that a test lamp illuminates between the B+ circuit terminal C and ground.

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

4. Connect the harness connector at the rear window wiper motor.
5. Disconnect the X2 harness connector at the LGM.
6. Ignition ON, test for 10.0 - 14.0 volts between the signal circuit terminal 3 and ground.

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

7. If all circuits test normal, replace the LGM.

Repair Instructions

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

* Rear Window Wiper Motor Replacement (Trailblazer, Envoy)