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 (Fusion/Milan/MKZ, Fusion Hybrid/Milan Hybrid), Wipers and Washers for schematic and connector information. Diagrams By Number

Normal Operation

Under normal operation, the wiper motor receives open and ground inputs from the multifunction switch through circuits CRW08 (VT/OG), CRW17 (GN/VT), CRW18 (VT/WH) and CRW19 (BU/OG) to activate the wipers to the appropriate speeds. The wiper/washer module supplies voltage to the wiper motor through circuits CRW16 ([GY/BN] low) and CRW15 ([BN/WH] high).

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Multifunction switch
- Wiper/washer module



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 WIPER MOTOR FOR SHORT TO VOLTAGE


- Ignition OFF.
- Disconnect: Wiper Motor C125.
- Disconnect: Wiper/Washer Module C2157.
- Ignition ON.
- With the wipers in the OFF position, measure the voltage between wiper motor C125-3, circuit CRW15 (BN/WH), harness side and ground; and between wiper motor C125-5, circuit CRW16 (GY/BN), harness side and ground.




- Is the voltage greater than 10 volts?

Yes
REPAIR the circuit(s) for a short to voltage. TEST the system for normal operation.

No
GO to B2.

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B2 CHECK THE MULTIFUNCTION SWITCH


- Disconnect: Multifunction Switch C202.
- Carry out the Multifunction Switch component test.

- Did the multifunction switch pass the component test?

Yes
GO to B3.

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

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B3 CHECK FOR A SHORT TO GROUND IN THE MULTIFUNCTION SWITCH HARNESS


- Measure the resistance between ground and wiper/washer module:
- C2157-8, circuit CRW08 (VT/OG), harness side.
- C2157-13, circuit CRW17 (GN/VT), harness side.
- C2157-14, circuit CRW19 (BU/OG), harness side.
- C2157-6, circuit CRW18 (VT/WH), harness side.




- Is the resistance greater than 10,000 ohms?

Yes
GO to B4.

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

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B4 CHECK FOR CORRECT WIPER/WASHER MODULE OPERATION


- Disconnect all wiper/washer module connectors.
- Check for:
- corrosion.
- pushed-out pins.
- Connect all wiper/washer module 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 wiper/washer module. REFER to Wiper/Washer Module 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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