Pinpoint Test I: The Washer Pump Is Inoperative

Wipers and Washers

Pinpoint Tests

Pinpoint Test I: The Washer Pump is Inoperative - Explorer Sport Trac

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

Normal Operation

During normal operation, the washer pump motor is powered through an internal relay in the wiper motor using circuit CRW14 (BU/WH). The multifunction switch provides input to the windshield wiper motor through circuit CRW07 (GY/BN) to activate the washer. The washer pump motor is grounded at all times through circuit GD120 (BK/GN).

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



PINPOINT TEST I: THE WASHER PUMP IS INOPERATIVE - EXPLORER SPORT TRAC

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I1 CHECK THE WASHER PUMP MOTOR FOR VOLTAGE


- Ignition OFF.
- Disconnect: Washer Pump Motor C137.
- Ignition ON.
- Measure the voltage between washer pump motor C137-1, circuit CRW14 (BU/WH) harness side and ground while depressing the multifunction switch to the WASH position.




- Is the voltage greater than 10 volts?

Yes
GO to I2.

No
GO to I3.

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I2 CHECK CIRCUIT GD120 (BK/GN) FOR GROUND


- Ignition OFF.
- Measure the resistance between washer pump motor C137-2, circuit GD120 (BK/GN), harness side and ground.




- Is the resistance less than 5 ohms?

Yes
INSTALL a new washer pump. REFER to Washer Pump Service and Repair.

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

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I3 CHECK CIRCUIT CRW14 (BU/WH) FOR AN OPEN


- Ignition OFF.
- Disconnect: Windshield Wiper Motor C125.
- Measure the resistance between windshield wiper motor C125-7, circuit CRW14 (BU/WH), harness side and washer pump motor C137-1, circuit CRW14 (BU/WH), harness side.




- Is the resistance less than 5 ohms?

Yes
GO to I4.

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

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I4 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 I5.

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

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I5 CHECK CIRCUIT CRW07 (GY/BN) FOR AN OPEN OR SHORT TO GROUND


- Measure the resistance between windshield wiper motor C125-12, circuit CRW07 (GY/BN), harness side and multifunction switch C202-10, circuit CRW07 (GY/BN), harness side; and between multifunction switch C202-10, circuit CRW07 (GY/BN), harness side and ground.




- Is the resistance less than 5 ohms between multifunction switch and wiper motor; and greater than 10,000 ohms between multifunction switch and ground?

Yes
GO to I6.

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

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I6 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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