Pinpoint Test E: The Rain Sensitive Wipers Do Not Operate
Wipers and Washers
Pinpoint Tests
Pinpoint Test E: The Rain Sensitive Wipers Do Not Operate
Refer to Wiring Diagram Set 81, Wipers and Washers for schematic and connector information. Diagrams By Number
Normal Operation
When the ignition switch is in the RUN or ACCESSORY position, the multifunction switch is in one of the 5 intermittent settings. When the rain sensor detects moisture on the windshield, it will send a serial data signal to the wiper motor through circuit VRW26 (BN/YE) to activate the wipers. Voltage is supplied to the rain sensor through circuit CBP43 (GY) and ground through circuit GD133 (BK). The rain sensor uses a jumper harness between the automatic high beam/rain sensor in line electrical connector and the rain sensor. When an inoperative condition exists in the rain sensitive wiper system, the rain sensitive wiper system will default to an intermittent wiper system.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Rain sensor
- Wiper motor
- Multifunction switch
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 adapters(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.
- 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 1 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
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E3 CHECK THE VOLTAGE TO THE RAIN SENSOR
- Ignition OFF.
- Disconnect: C914.
- Ignition ON.
- Measure the voltage between rain sensor C914-1, circuit CBP43, 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 THE GROUND TO THE RAIN SENSOR
- Ignition OFF.
- Measure the resistance between rain sensor C914-4, circuit GD133, 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 CIRCUIT VRW26 FOR A SHORT TO VOLTAGE
- Ignition ON.
- Measure the voltage between the rain sensor C914-3, circuit VRW26, 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 CIRCUIT VRW26 FOR AN OPEN OR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: Wiper Motor C125.
- Measure the resistance between wiper motor C125-4, circuit VRW26 (BN/YE), harness side and rain sensor C914-3, circuit VRW26, harness side; and between wiper motor C125-4, circuit VRW26 (BN/YE), harness side and ground.
- Is the resistance less than 5 ohms between the wiper motor and the rain sensor; and greater than 10,000 ohms between the wiper motor and ground?
Yes
INSTALL a new rain sensor. REFER to Rain Sensor Service and Repair. TEST the system for normal operation.
No
REPAIR the circuit. TEST the system for normal operation.
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