Pinpoint Test G: The Intermittent Wiper Speed Does Not Operate Correctly - Windshield

Wipers and Washers

Pinpoint Tests

Pinpoint Test G: The Intermittent Wiper Speed Does Not Operate Correctly - Windshield

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 open and ground inputs from the multifunction switch through circuits CRW17 (GN/VT), CRW18 (VT/WH), CRW19 (BU/OG) and CRW08 (VT/OG) to activate the wipers to the appropriate speeds.

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



PINPOINT TEST G: THE INTERMITTENT WIPER SPEED DOES NOT OPERATE CORRECTLY - WINDSHIELD

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G1 CHECK THE MULTIFUNCTION SWITCH


- Ignition OFF.
- Disconnect: Multifunction Switch C202.
- Carry out the Multifunction Switch Component Test.

- Did the multifunction switch pass the component test?

Yes
GO to G2.

No
INSTALL a new multifunction switch. TEST the system for normal operation.

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G2 CHECK CIRCUITS CRW19 (BU/OG), CRW18 (VT/WH) AND CRW17 (GN/VT) FOR AN OPEN


- Disconnect: Windshield Wiper Motor C125.
- Measure the resistance between multifunction switch C202 harness side and windshield wiper motor C125 harness side using the following chart:









- Is the resistance less than 5 ohms?

Yes
GO to G3.

No
REPAIR the circuit(s) in question. TEST the system for normal operation.

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G3 CHECK CIRCUITS CRW19 (BU/OG), CRW18 (VT/WH), CRW08 (VT/OG) AND CRW17 (GN/VT) FOR A SHORT TO GROUND


- Measure the resistance between ground and windshield wiper motor:
- C125-9, circuit CRW17 (GN/VT), harness side.
- C125-10, circuit CRW19 (BU/OG), harness side.
- C125-11, circuit CRW18 (VT/WH), harness side.




- Is the resistance greater than 10,000 ohms?

Yes
GO to G4.

No
REPAIR the circuit(s) in question. TEST the system for normal operation.

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G4 CHECK FOR SHORTS IN THE WINDSHIELD WIPER MOTOR HARNESS


- Measure the resistance at windshield wiper motor C125 between the circuits shown in the following chart.









- Is the resistance greater than 10,000 ohms for all measurements?

Yes
GO to G5.

No
REPAIR the circuit. TEST the system for normal operation.

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G5 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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