Pinpoint Test B: The Wipers Stay on Continuously

Wipers and Washers

Pinpoint Tests

Pinpoint Test B: The Wipers Stay on Continuously

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

Normal Operation

During normal operation, the windshield wiper motor receives voltage at all times through the front wiper relay through circuit CBB49 (VT/GY). The windshield wiper motor also receives power with the ignition switch in RUN or ACC positions through Smart Junction Box (SJB) fuse 45 (5A), circuit CBP45 (YE). The run/park and high/low relays are contained in the wiper motor electronics. Mode of operation is dependent on the signal(s) received from the multifunction switch. 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. Shorts in any of these circuits could cause the wipers to stay on continuously.

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



PINPOINT TEST B: THE WIPERS STAY ON CONTINUOUSLY

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

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B1 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 B2.

No
INSTALL a new multifunction switch. REFER to Steering Column.

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B2 CHECK CIRCUIT CRW19 (BU/OG), CRW18 (VT/WH), CRW08 (VT/OG) OR CRW17 (GN/VT) FOR SHORTS


- Disconnect: Windshield Wiper Motor C125.
- Using the following table, measure the resistance between windshield wiper motor C125, harness side and ground:









- Is the resistance greater than 10,000 ohms?

Yes
GO to B3.

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

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B3 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 Service and Repair.

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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