Pinpoint Test D: The Intermittent Wiper Speed Does Not Operate Correctly (High/Low Speeds OK)
Wipers and Washers
Pinpoint Test D: The Intermittent Wiper Speed Does Not Operate Correctly (High/Low Speeds OK)
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, low and intermittent speeds.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Multifunction switch
- Wiper/washer module
PINPOINT TEST D: THE INTERMITTENT WIPER SPEED DOES NOT OPERATE CORRECTLY (HIGH/LOW SPEEDS OK)
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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D1 VERIFY IF THE VEHICLE IS EQUIPPED WITH RAIN SENSITIVE WIPERS
NOTE: If sent here from Pinpoint Test E, GO to D2.
- Inspect the vehicle for rain sensitive wipers.
- Is the vehicle equipped with rain sensitive wipers?
Yes
IDENTIFY the customer concern and GO to Symptom Chart. Symptom Related Diagnostic Procedures
No
GO to D2.
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D2 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 D3.
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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D3 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 D4.
No
REPAIR the circuit(s) in question. TEST the system for normal operation.
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D4 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 D5.
No
REPAIR the circuit(s) in question. TEST the system for normal operation.
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D5 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 D6.
No
REPAIR the circuit(s). TEST the system for normal operation.
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D6 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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