Pinpoint Test C: The High/Low Wiper Speeds Do Not Operate Correctly
Wipers and Washers
Pinpoint Test C: The High/Low Wiper Speeds Do Not Operate Correctly
Refer to Wiring Diagram Set 81 (Fusion/Milan/MKZ, Fusion Hybrid, Milan Hybrid, MKZ Hybrid), Wipers and Washers for schematic and connector information. Diagrams By Number
Normal Operation
Under normal operation, the wiper/washer module receives open and ground inputs from the multifunction switch through circuits CRW08 (VT/OG), CRW17 (GN/VT), CRW18 (VT/WH) and CRW19 (BU/OG) to activate the wiper motor in the high and low speeds. The wiper/washer module supplies voltage to the wiper motor through circuits CRW16 ([GY/BN] low) and CRW15 ([BN/WH] high).
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Wiper motor
- Multifunction switch
- Wiper/washer module
PINPOINT TEST C: THE HIGH/LOW WIPER SPEEDS DO NOT OPERATE CORRECTLY
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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C1 CHECK THE MULTIFUNCTION SWITCH
- Ignition OFF.
- Disconnect: Multifunction Switch C202.
- Carry out the Multifunction Switch component test.
- Did the multifunction switch pass the component test?
Yes
GO to C2.
No
INSTALL a new multifunction switch. REFER to Steering Column Switches Steering Column Multifunction Switch. TEST the system for normal operation.
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C2 CHECK FOR A SHORT TO GROUND IN THE MULTIFUNCTION SWITCH HARNESS
- Disconnect: Wiper/Washer Module C2157.
- Measure the resistance between ground and wiper/washer module:
- C2157-8, circuit CRW08 (VT/OG), harness side.
- C2157-13, circuit CRW17 (GN/VT), harness side.
- C2157-14, circuit CRW19 (BU/OG), harness side.
- C2157-6, circuit CRW18 (VT/WH), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to C3.
No
REPAIR the circuit(s) in question. TEST the system for normal operation.
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C3 CHECK FOR AN OPEN IN THE MULTIFUNCTION SWITCH HARNESS
- Measure the resistance between multifunction switch C202, harness side and wiper/washer module C2157, harness side using the following chart:
- Is the resistance less than 5 ohms?
Yes
GO to C4.
No
REPAIR the circuit(s) in question. TEST the system for normal operation.
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C4 CHECK FOR A SHORT IN THE WIPER/WASHER MODULE HARNESS
- Measure the resistance between multifunction switch C202, harness side, using the following chart:
- Is the resistance greater than 10,000 ohms for all measurements?
Yes
GO to C5.
No
REPAIR the circuit(s). TEST the system for normal operation.
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C5 CHECK WIPER MOTOR LOW SPEED FOR VOLTAGE
- Connect: Wiper/Washer Module C2157.
- Connect: Multifunction Switch C202.
- Ignition ON.
- With the multifunction switch in the low position, measure the voltage between wiper motor C125-5, circuit CRW16 (GY/BN), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to C7.
No
GO to C6.
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C6 CHECK WIPER MOTOR LOW SPEED FOR AN OPEN
- Ignition OFF.
- Measure the resistance between wiper motor C125-5, circuit CRW16 (GY/BN), harness side and wiper/washer module C2157-4, circuit CRW16 (GY/BN), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to C9.
No
REPAIR the circuit. TEST the system for normal operation.
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C7 CHECK WIPER MOTOR HIGH SPEED FOR VOLTAGE
- With the multifunction switch in the high position, measure the voltage between wiper motor C125-3, circuit CRW15 (BN/WH), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
INSTALL a new wiper motor. REFER to Wiper Motor Service and Repair. TEST the system for normal operation.
No
GO to C8.
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C8 CHECK WIPER MOTOR HIGH SPEED FOR AN OPEN
- Ignition OFF.
- Measure the resistance between wiper motor C125-3, circuit CRW15 (BN/WH), harness side and wiper/washer module C2157-11, circuit CRW15 (BN/WH), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to C9.
No
REPAIR the circuit. TEST the system for normal operation.
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C9 CHECK FOR CORRECT WIPER/WASHER MODULE OPERATION
- Disconnect all wiper/washer module connectors.
- Check for:
- corrosion.
- pushed-out pins.
- Connect all wiper/washer module 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/washer module. REFER to Wiper/Washer Module 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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