Pinpoint Test H: The Washer Pump Is Inoperative
Wipers and Washers
Pinpoint Tests
Pinpoint Test H: The Washer Pump is Inoperative
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 windshield and rear window wiper motors using circuits CRW14 (BU/WH) and CPW23 (VT/GN). 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 CPW23 (VT/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 H: THE WASHER PUMP IS INOPERATIVE
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H1 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 H3.
No
GO to H2.
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H2 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 H13.
No
REPAIR the circuit. TEST the system for normal operation.
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H3 CHECK CIRCUIT CPW23 (VT/GN) FOR GROUND
- Measure the resistance between washer pump motor C137-1, circuit CPW23 (VT/GN), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to H5.
No
GO to H4.
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H4 CHECK CIRCUIT CPW23 (VT/GN) FOR AN OPEN
- Ignition OFF.
- Disconnect: Rear Window Wiper Motor C476.
- Measure the resistance between rear window wiper motor C476-7, circuit CPW23 (VT/GN), harness side and washer pump motor C137-1, circuit CPW23 (VT/GN), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to H14.
No
REPAIR the circuit. TEST the system for normal operation.
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H5 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 windshield wash position.
- Is the voltage greater than 10 volts?
Yes
GO to H9.
No
GO to H6.
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H6 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 H7.
No
REPAIR the circuit. TEST the system for normal operation.
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H7 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 H8.
No
INSTALL a new multifunction switch. TEST the system for normal operation.
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H8 CHECK CIRCUIT CRW07 (GY/BN) FOR AN OPEN OR SHORT TO GROUND
- Measure the resistance between 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 H13.
No
REPAIR the circuit. TEST the system for normal operation.
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H9 CHECK CIRCUIT CPW23 (VT/GN) FOR VOLTAGE
- Measure the voltage between washer pump motor C137-1, circuit CPW23 (VT/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. REFER to Washer Pump Washer Pump. TEST the system for normal operation.
No
GO to H10.
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H10 CHECK CIRCUIT CPW23 (VT/GN) FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: Rear Window Wiper Motor C476.
- Measure the resistance between washer pump motor C137-1, circuit CPW23 (VT/GN), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to H11.
No
REPAIR the circuit. TEST the system for normal operation.
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H11 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 H12.
No
INSTALL a new multifunction switch. TEST the system for normal operation.
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H12 CHECK CIRCUIT CRW20 (GY/YE) FOR AN OPEN OR SHORT TO GROUND
- Measure the resistance between multifunction switch C202-14, circuit CRW20 (GY/YE), harness side and rear window wiper motor C476-4, 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 H14.
No
REPAIR the circuit. TEST the system for normal operation.
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H13 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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H14 CHECK THE REAR WINDOW 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 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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