Pinpoint Test I: The Washer Pump Is Inoperative
Wipers and Washers
Pinpoint Tests
Pinpoint Test I: The Washer Pump is Inoperative - Taurus X
Refer to Wiring Diagram Set 81, Wipers and Washers for schematic and connector information. Diagrams By Number
Normal Operation
Under normal operation, the washer pump motor is grounded through internal relays in the wiper motors using circuits CRW14 (BU/WH), GD120 (BK/GN) and GD133 (BK). The multifunction switch provides input to the windshield wiper motor through circuit CRW07 (GY/BN) to activate the windshield washer. The windshield wiper motor activates the internal relay and then provides power to the washer pump through circuit CRW14 (BU/WH). The multifunction switch provides input to the rear window wiper motor through circuit CRW20 (GY/YE) to activate the rear window washer. When the rear window washer is activated, the internal relay in the rear window wiper motor provides power through circuit GD120 (BK/GN).
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Multifunction switch
- Washer pump motor
- Windshield wiper motor
- Rear window wiper motor
PINPOINT TEST I: THE WASHER PUMP IS INOPERATIVE - TAURUS X
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I1 CHECK CIRCUIT CRW14 (BU/WH) FOR GROUND
- Disconnect: Washer Pump Motor C137.
- Ignition ON.
- Measure the resistance between washer pump motor C137-2, circuit CRW14 (BU/WH) harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to I3.
No
GO to I2.
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I2 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 C137-2, circuit CRW14 (BU/WH) harness side.
- Is the resistance less than 5 ohms?
Yes
GO to I14.
No
REPAIR the circuit. TEST the system for normal operation.
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I3 CHECK CIRCUIT GD120 (BK/GN) FOR GROUND
- Measure the resistance between washer pump motor C137-1, circuit GD120 (BK/GN) harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to I6.
No
GO to I4.
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I4 CHECK CIRCUIT GD120 (BK/GN) FOR AN OPEN
- Ignition OFF.
- Disconnect: Rear Window Wiper Motor C476.
- Measure the resistance between rear window wiper motor C476-6, circuit GD120 (BK/GN), harness side and washer pump motor C137-1, circuit GD120 (BK/GN) harness side.
- Is the resistance less than 5 ohms?
Yes
GO to I5.
No
REPAIR the circuit. TEST the system for normal operation.
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I5 CHECK CIRCUIT GD133 (BK) FOR AN OPEN
- Measure the resistance between rear window wiper motor C476-5, circuit GD133 (BK), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to I15.
No
REPAIR the circuit. TEST the system for normal operation.
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I6 CHECK CIRCUIT CRW14 (BU/WH) FOR VOLTAGE
- Ignition ON.
- Measure the voltage between washer pump motor C137-2, 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 I10.
No
GO to I7.
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I7 CHECK CIRCUIT CRW14 (BU/WH) FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: Windshield Wiper Motor C125.
- Measure the resistance between washer pump motor C137-2, circuit CRW14 (BU/WH) harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to I8.
No
REPAIR the circuit. TEST the system for normal operation.
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I8 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 I9.
No
INSTALL a new multifunction switch. TEST the system for normal operation.
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I9 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 I14.
No
REPAIR the circuit. TEST the system for normal operation.
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I10 CHECK CIRCUIT GD120 (BK/GN) FOR VOLTAGE
- Measure the voltage between washer pump motor C137-1, circuit GD120 (BK/GN) harness side and ground while depressing the multifunction switch to the rear wash position.
- Is the voltage greater than 10 volts?
Yes
INSTALL a new washer pump. TEST the system for normal operation.
No
GO to I11.
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I11 CHECK CIRCUIT GD120 (BK/GN) FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: Rear Window Wiper Motor C476.
- Measure the resistance between washer pump motor C137-1, circuit GD120 (BK/GN) harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to I12.
No
REPAIR the circuit. TEST the system for normal operation.
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I12 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 I13.
No
INSTALL a new multifunction switch. TEST the system for normal operation.
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I13 CHECK CIRCUIT CRW20 (GY/YE) FOR AN OPEN OR SHORT TO GROUND
- Measure the resistance between rear window wiper motor C476-3, circuit CRW20 (GY/YE) harness side and multifunction switch C202-14, circuit CRW20 (GY/YE) harness side; and between multifunction switch C202-14, circuit CRW20 (GY/YE) 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 I15.
No
REPAIR the circuit. TEST the system for normal operation.
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I14 CHECK THE WINDSHIELD WIPER MOTOR
- 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. TEST the system for normal operation.
No
REPAIR the circuit. TEST the system for normal operation.
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I15 CHECK THE REAR WINDOW WIPER MOTOR
- Disconnect all wiper motor connectors.
- Check for:
- liftgate open.
- 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 rear window wiper motor. REFER to Wiper Motor - Rear Window Wiper Motor - Rear Window. TEST the system for normal operation.
No
REPAIR the circuit. TEST the system for normal operation.
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