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
When activated, the windshield wiper/washer switch sends a ground signal through circuit 680 (LB/OG) to the windshield wiper motor. The windshield wiper motor then supplies voltage through circuit 941 (BK/WH) to activate the windshield washer pump motor. Ground is provided to the windshield washer pump through circuit 1205 (BK).
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Windshield wiper motor
- Windshield washer pump
PINPOINT TEST E: THE WASHER PUMP IS INOPERATIVE
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E1 CHECK CIRCUIT 1205 (BK) FOR AN OPEN
- Ignition OFF.
- Disconnect: Washer Pump Motor C137.
- Measure the resistance between the windshield washer pump C137-2, circuit 1205 (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 THE WINDSHIELD WASHER PUMP FOR VOLTAGE
- Ignition ON.
- Measure the voltage between the windshield washer pump C137-1, circuit 941 (BK/WH) harness side and ground while pressing the windshield wiper/washer 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 THE WINDSHIELD WIPER/WASHER SWITCH
- Ignition OFF.
- Disconnect: Windshield Wiper/Washer Switch C2137.
- Carry out the windshield wiper/washer switch component test.
- Does the windshield wiper/washer switch pass the component test?
Yes
GO to E4.
No
INSTALL a new windshield wiper/washer switch. REFER to Wiper/Washer Switch Wiper/Washer Switch.
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E4 CHECK CIRCUIT 680 (LB/OG) FOR AN OPEN CIRCUIT
- Disconnect: Windshield Wiper Motor C125.
- Measure the resistance between the windshield wiper/washer switch C2137-5, circuit 680 (LB/OG), harness side and windshield wiper motor connector C125-12, circuit 680 (LB/OG), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to E5.
No
REPAIR the circuit. TEST the system for normal operation.
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E5 CHECK CIRCUIT 941 (BK/WH) FOR AN OPEN CIRCUIT
- Measure the resistance between the windshield wiper motor connector C125-7, circuit 941 (BK/WH), harness side and the windshield washer pump connector C137-1, circuit 941 (BK/WH), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to E6.
No
REPAIR the circuit. TEST the system for normal operation.
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E6 CHECK FOR CORRECT WINDSHIELD WIPER MOTOR OPERATION
- Disconnect the 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 Service and Repair. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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