Pinpoint Test A: The Wipers Are Inoperative - Windshield

Wipers and Washers

Pinpoint Tests

Pinpoint Test A: The Wipers are Inoperative - Windshield

Refer to Wiring Diagram Set 81 (Escape/Mariner, Escape Hybrid/Mariner Hybrid), Wipers and Washers for schematic and connector information. Diagrams By Number

Normal Operation

Under normal operation, the front windshield wiper motor receives power through circuit CBP45 (YE) and SBB10 (YE/RD). The front windshield wiper motor is grounded through circuits GD123 (BK/GY) and GD120 (BK/GN). The multifunction switch is grounded through circuit GD114 (BK/BU). The front 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 modes.

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



PINPOINT TEST A: THE WIPERS ARE INOPERATIVE - WINDSHIELD

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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A1 CHECK CIRCUIT CBP45 (YE) AND SBB10 (YE/RD) FOR VOLTAGE


- Ignition OFF.
- Disconnect: Windshield Wiper Motor C125.
- Ignition ON.
- Measure the voltage between ground and windshield wiper motor:
- C125-5, circuit SBB10 (YE/RD), harness side.
- C125-8, circuit CBP45 (YE), harness side.




- Are the voltages greater than 10 volts?

Yes
GO to A2.

No
VERIFY the Battery Junction Box (BJB) fuse 10 (30A) and Smart Junction Box (SJB) fuse 45 (5A) are OK. If OK, REPAIR the circuit(s) in question.
If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. TEST the system for normal operation.

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A2 CHECK CIRCUITS GD120 (BK/GN) AND GD123 (BK/GY) FOR AN OPEN


- Ignition OFF.
- Measure the resistance between ground and windshield wiper motor:
- C125-3, circuit GD123(BK/GY), harness side.
- C125-6, circuit GD120 (BK/GN), harness side.




- Are the resistances less than 5 ohms?

Yes
GO to A3.

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

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A3 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 A4.

No
INSTALL a new multifunction switch.

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A4 CHECK CIRCUIT GD114 (BK/BU) FOR AN OPEN


- Measure the resistance between multifunction switch C202-15, circuit GD114 (BK/BU), harness side and ground.




- Is the resistance less than 5 ohms?

Yes
GO to A5.

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

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A5 CHECK FOR CORRECT WINDSHIELD WIPER MOTOR OPERATION


- Disconnect all windshield wiper motor connectors.
- Check for:
- corrosion.
- pushed-out pins.
- Connect all the windshield 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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