Pinpoint Test E: The Rain Sensitive Wipers Do Not Operate
Wipers and Washers
Pinpoint Test E: The Rain Sensitive Wipers Do Not Operate
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
When the multifunction switch is in one of the 5 intermittent settings and the rain sensor detects moisture on the windshield, the rain sensor will send a serial data signal to the wiper motor through circuit VRW06 (GN/WH) to activate the wipers. Voltage is supplied to the rain sensor through circuit CBP43 (GY) and ground through circuit GD139 (BK/YE). When an inoperative condition exists in the rain sensitive wiper system, the rain sensitive wiper system will default to an intermittent wiper system if the rain sensor fault occurred prior to the ignition in the RUN position.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Rain sensor mounting bracket not secured to the windshield
- Wiper blades
- Multifunction switch
- Rain sensor
- Wiper/washer module
PINPOINT TEST E: THE RAIN SENSITIVE WIPERS DO NOT OPERATE
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 THE RAIN SENSITIVE WIPERS FOR INTERMITTENT OPERATION
- Ignition ON.
- NOTE: When an inoperative condition exists in the rain sensitive wiper system, the rain sensitive wiper system will default to an intermittent wiper system if the rain sensor fault occurred prior to the ignition in the RUN position.
- NOTE: Make sure the windshield is dry when carrying out this step.
- NOTE: The wipers will make a single wipe of the windshield when the multifunction switch is initially set to 1 of the 5 intermittent settings. This single wipe should not be considered part of an intermittent wiper operation.
- Turn the multifunction switch to one of the 5 intermittent settings.
- Do the wipers operate intermittently?
Yes
GO to E3.
No
GO to E2.
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E2 CHECK THE RAIN SENSITIVE WIPERS OPERATION
NOTE: The multifunction switch and circuits are identical for rain sensitive and intermittent wiper systems.
- Turn the multifunction switch to each of the 5 intermittent settings while applying water on the windshield above the rain sensor.
- Do the wipers operate in all intermittent positions?
Yes
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
No
GO to Pinpoint Test D. CHECK specifically for intermittent multifunction switch operation and/or associated wiring problems. Pinpoint Test D: The Intermittent Wiper Speed Does Not Operate Correctly (High/Low Speeds OK)
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E3 CHECK VOLTAGE TO THE RAIN SENSOR MODULE
- Ignition OFF.
- Disconnect: Rain Sensor Module C914.
- Ignition ON.
- Measure the voltage between the rain sensor module C914-4, circuit CBP43 (GY), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to E4.
No
REPAIR the circuit. TEST the system for normal operation.
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E4 CHECK GROUND TO THE RAIN SENSOR MODULE
- Ignition OFF.
- Measure the resistance between rain sensor module C914-1, circuit GD139 (BK/YE), harness side and ground.
- 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 RAIN SENSOR MODULE OUTPUT FOR A SHORT TO VOLTAGE
- Ignition ON.
- Measure the voltage between rain sensor module C914-2, circuit VRW06 (GN/WH), harness side and ground.
- Is any voltage present?
Yes
REPAIR the circuit. TEST the system for normal operation.
No
GO to E6.
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E6 CHECK RAIN SENSOR MODULE OUTPUT FOR AN OPEN OR SHORT
- Ignition OFF.
- Disconnect: Wiper/Washer Module C2157.
- Measure the resistance between wiper/washer module C2157-1, circuit VRW06 (GN/WH), harness side and rain sensor module C914-2, circuit VRW06 (GN/WH), harness side; and between wiper/washer module C2157-1, circuit VRW06 (GN/WH), harness side and ground.
- Is the resistance less than 5 ohms between the wiper/washer module and the rain sensor module connector; and greater than 10,000 ohms between the wiper/washer module and ground?
Yes
INSTALL a new rain sensor module. REFER to Rain Sensor Rain Sensor. TEST the system for normal operation.
No
REPAIR the circuit. TEST the system for normal operation
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