Pinpoint Test K: The Speed Dependent Interval Mode Does Not Operate Correctly

Wipers and Washers

Pinpoint Tests

Pinpoint Test K: The Speed Dependent Interval Mode Does Not Operate Correctly

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

Normal Operation

Under normal operation, the windshield wiper motor receives vehicle speed information from the PCM through circuit VMC05 (VT/OG). The speed dependent wipers function in all INT modes except INT 1.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Windshield wiper motor
- PCM



PINPOINT TEST K: THE SPEED DEPENDENT INTERVAL MODE DOES NOT OPERATE CORRECTLY

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K1 REVIEW THE DTCs


- Review the DTCs from the PCM self-test.
- Are any Vehicle Speed Sensor (VSS) related DTCs present?

Yes
REFER to Computers and Control Systems Information to diagnose the fault.

No
GO to K2.

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K2 CHECK CIRCUIT VMC05 (VT/OG) FOR AN OPEN


- Disconnect: PCM C175b.
- Disconnect: Windshield Wiper Motor C125.
- Measure the resistance between PCM C175b-1, circuit VMC05 (VT/OG), harness side and windshield wiper motor C125-4, circuit VMC05 (VT/OG), harness side.




- Is the resistance less than 5 ohms?

Yes
GO to K3.

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

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K3 CHECK CIRCUIT VMC05 (VT/OG) FOR A SHORT TO GROUND


- Measure the resistance between PCM C175b-1, circuit VMC05 (VT/OG), harness side and ground.




- Is the resistance greater than 10,000 ohms?

Yes
GO to K4.

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

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K4 CHECK FOR CORRECT WIPER MOTOR OPERATION


- Disconnect all wiper motor connectors.
- Check for:
- corrosion.
- pushed-out pins.
- Connect all wiper motor connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?

Yes
INSTALL a new windshield wiper motor. REFER to Wiper Motor - Windshield Wiper Motor - Windshield.

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

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