Pinpoint Test C: The High/Low Wiper Speeds Do Not Operate Correctly

Wipers and Washers

Pinpoint Tests

Pinpoint Test C: The High/Low Wiper Speeds Do Not Operate Correctly

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

Normal Operation

During normal operation, mode of operation is dependent on the signal(s) received from the multifunction switch.The run/park and high/low relays are contained in the wiper motor electronics. 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 not to operate correctly.

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



PINPOINT TEST C: THE HIGH/LOW WIPER SPEEDS DO NOT OPERATE CORRECTLY

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C1 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 C2.

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

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C2 CHECK CIRCUITS CRW19 (BU/OG), CRW08 (VT/OG) AND CRW17 (GN/VT) FOR OPENS


- Disconnect: Windshield Wiper Motor C125.
- Using the following table, measure the resistance between multifunction switch C202, harness side and windshield wiper motor C125, harness side:









- Are the resistances less than 5 ohms?

Yes
GO to C3.

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

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C3 CHECK CIRCUITS CRW19 (BU/OG), CRW18 (VT/WH), CRW08 (VT/OG) AND CRW17 (GN/VT) FOR A SHORT TO GROUND


- 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 C4.

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

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C4 CHECK FOR SHORTS IN THE WINDSHIELD WIPER MOTOR HARNESS


- Measure the resistance between wiper motor C125, harness side, using the following chart:









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

Yes
GO to C5.

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

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C5 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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