Pinpoint Test C: The Wipers Stay ON Continuously - Windshield

Wipers and Washers

Pinpoint Test C: The Wipers Stay ON Continuously - Windshield

Refer to Wiring Diagram Set 81, Wipers and Washers for schematic and connector information. Diagrams By Number

Normal Operation

The Body Control Module (BCM) supplies a signal voltage(s) to the wiper/washer switch for the HIGH speed, LOW speed, and INTERMITTENT functions. Each function has its own dedicated signal (sense) line. The wiper/washer switch physically grounds the signal voltage(s) when a function is selected. The BCM then reacts to the grounded signal voltage(s) and its integral electronics make a decision on which wiper system function to carry out.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Wiper/washer switch
- Windshield wiper motor
- BCM

PINPOINT TEST C: THE WIPERS STAY ON CONTINUOUSLY - WINDSHIELD

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C1 CHECK FOR BCM DTCs

- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self-Test - BCM.
- Are any BCM DTCs present?

Yes
REFER to the Body Control Module (BCM) DTC Chart for further diagnosis. [1][2]Diagnostic Trouble Code Descriptions

No
GO to C2.

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C2 CHECK THE BCM WINDSHIELD WIPER SWITCH PIDs

- Enter the following diagnostic mode on the scan tool: DataLogger - BCM.
- Monitor the BCM PIDs listed below while operating the wiper/washer switch in the INTERMITTENT, LOW and HIGH positions.
- Front Wiper Interval/Auto Wiper Switch (FRNWIPER_Int)
- Front Wiper Command Low Speed (FRNWIPER_Lo)
- Front Wiper Command High Speed (FRNWIPER_Hi)
- Does the status of each PID match the wiper/washer switch setting?

Yes
GO to C4.

No
GO to C3.

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C3 CHECK THE WIPER/WASHER SWITCH

- Ignition OFF.
- Disconnect: Wiper/Washer Switch C2081.
- Carry out the wiper/washer switch component test.
Refer to Windshield Washer Switch or Wiper Switch for component testing.

- Does the wiper/washer switch pass the component test?

Yes
GO to C5.

No
INSTALL a new wiper/washer switch. REFER to Steering Column Switches Steering Column Multifunction Switch. TEST the system for normal operation.

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C4 CHECK WINDSHIELD WIPER MOTOR LOW AND HIGH RELAY OUTPUT CIRCUITS FOR A SHORT TO VOLTAGE

- Ignition OFF.
- Disconnect: Windshield Wiper Motor C125.
- Disconnect: BCM C2280A.
- Ignition ON.
- Measure the voltage between windshield wiper motor C125-1, circuit CRW15 (BN/WH), harness side and ground and between windshield wiper motor C125-2, circuit CRW16 (GY/BN), harness side and ground.




- Is voltage present on either circuit?

Yes
REPAIR the affected circuit. TEST the system for normal operation.

No
GO to C5.

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C5 CHECK FOR CORRECT BCM OPERATION

- Ignition OFF.
- Inspect the BCM connectors for the following conditions:
- corrosion
- damaged or pushed out pins
- Connect the BCM connectors and make sure they seat correctly.
- Connect: Windshield Wiper Motor C125.
- Operate the system and verify if the concern is still present.
- Is the concern still present?

Yes
INSTALL a new BCM. REFER to Multifunction Electronic Modules Body Control Module (BCM). TEST the system for normal operation.

No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.

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