Pinpoint Test A: The Wipers Are Inoperative
Wipers and Washers
Pinpoint Tests
Pinpoint Test A: The Wipers are Inoperative
Refer to Wiring Diagram Set 81, Wipers and Washers for schematic and connector information. Diagrams By Number
Normal Operation
The windshield wiper motor receives open and ground inputs from the windshield wiper/washer switch through circuits 56 (DB/OG), 58 (WH), 61 (YE/RD) and 63 (RD) to activate the wipers to the appropriate modes. The internal wiper motor module controls the internal wiper run/park relay to control the windshield wiper motor in conjunction with the internal wiper high/low relay. The windshield wiper motor receives voltage from circuit 2026 (RD/OG) and is grounded through circuit 1205 (BK). The windshield wiper motor internal microprocessor and relays receive voltage from circuit 2025 (RD/YE) and are grounded through circuit 1205 (BK).
This pinpoint test is intended to diagnose the following:
- Fuse(s)
- Wiring, terminals or connectors
- Windshield wiper/washer switch
- Windshield wiper motor
PINPOINT TEST A: THE WIPERS ARE INOPERATIVE
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A1 CHECK CIRCUITS 2025 (RD/YE) AND 2026 (RD/OG) FOR VOLTAGE
- Ignition OFF.
- Disconnect: Windshield Wiper Motor C125.
- Ignition ON.
- Measure the voltage between the windshield wiper motor C125-5, circuit 2026 (RD/OG), harness side and ground; and between windshield wiper motor C125-8, circuit 2025 (RD/YE), harness side and ground.
- Are the voltages greater than 10 volts?
Yes
GO to A2.
No
VERIFY the Smart Junction Box (SJB) fuse 3 (10A) and Bussed Electrical Center (BEC) fuse 10 (30A) are OK. If OK, REPAIR the circuit(s) in question. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. TEST the system for normal operation.
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A2 CHECK CIRCUIT 1205 (BK) FOR AN OPEN
- Ignition OFF.
- Measure the resistance between the windshield wiper motor C125-3, circuit 1205 (BK), harness side and ground; and between windshield wiper motor C125-6, circuit 1205 (BK), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to A3.
No
REPAIR the circuit. TEST the system for normal operation.
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A3 CHECK THE WINDSHIELD WIPER/WASHER SWITCH
- 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 A4.
No
INSTALL a new windshield wiper/washer switch. REFER to Wiper/Washer Switch Wiper/Washer Switch.
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A4 CHECK CIRCUIT 1205 (BK) FOR AN OPEN
- Measure the resistance between the windshield wiper/washer switch C2137-2, circuit 1205 (BK), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to A5.
No
REPAIR the circuit. TEST the system for normal operation.
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A5 CHECK FOR SHORTS IN THE WINDSHIELD WIPER MOTOR HARNESS
- Measure the resistance at windshield wiper motor C125 using the following chart:
- Is the resistance greater than 10,000 ohms for all measurements?
Yes
GO to A6.
No
REPAIR the circuit. TEST the system for normal operation.
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A6 CHECK FOR CORRECT WINDSHIELD WIPER MOTOR OPERATION
- Disconnect all 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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