Pinpoint Test E: The Washer Pump is Inoperative
Wipers and Washers
Pinpoint Tests
Pinpoint Test E: The Washer Pump is Inoperative
Refer to Wiring Diagram Set 81, Wipers and Washers for schematic and connector information. Diagrams By Number
Normal Operation
The multifunction switch provides a ground signal to the wiper motor through circuit CRW07 (GY/BN) when the wash function is selected on the multifunction switch. When the wiper motor detects this input, the wiper motor activates an internal washer relay that provides voltage to the washer pump through circuit CRW14 (BU/WH). The washer pump is grounded through circuit GD122 (BK).
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Multifunction switch
- Washer pump
- Windshield wiper motor
PINPOINT TEST E: THE WASHER PUMP IS INOPERATIVE
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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E1 CHECK CIRCUIT GD122 (BK) FOR AN OPEN
- Ignition OFF.
- Disconnect: Washer Pump Motor C137.
- Measure the resistance between washer pump motor C137-2, circuit GD122 (BK), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to E2.
No
REPAIR the circuit. TEST the system for normal operation.
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E2 CHECK CIRCUIT CRW14 (BU/WH) FOR VOLTAGE
- 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
INSTALL a new washer pump. REFER to Washer Pump and Reservoir Service and Repair.
No
GO to E3.
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E3 CHECK CIRCUIT CRW14 (BU/WH) FOR AN OPEN
- Ignition OFF.
- Disconnect: 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 E4.
No
REPAIR the circuit. TEST the system for normal operation.
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E4 CHECK CIRCUIT CRW07 (GY/BN) FOR AN OPEN OR SHORT TO GROUND
- Disconnect: Multifunction Switch C202C.
- Measure the resistance between wiper motor C125-12, circuit CRW07 (GY/BN) harness side and multifunction switch C202C-2, circuit CRW07 (GY/BN) harness side; and between multifunction switch C202C-2, 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 E5.
No
REPAIR the circuit. TEST the system for normal operation.
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E5 CHECK THE MULTIFUNCTION SWITCH
- Ignition OFF.
- Disconnect: Multifunction Switch C202C.
- Carry out the Multifunction Switch Component Test.
Refer to Headlamp Dimmer Switch, Turn Signal Switch, Windshield Washer Switch, or Wiper Switch for component testing.
- Did the multifunction switch pass the component test?
Yes
GO to E6.
No
INSTALL a new multifunction switch. REFER to Steering Column Switches Steering Column Multifunction Switch.
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E6 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 wiper motor. REFER to Wiper Motor 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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