Pinpoint Test D: The Wipers Stay On Continuously - Rear Window

Wipers and Washers

Pinpoint Tests

Pinpoint Test D: The Wipers Stay On Continuously - Rear Window

Refer to Wiring Diagram Set 81, Wipers and Washers for schematic and connector information. Diagrams By Number

Normal Operation

Under normal operation, the rear window wiper motor receives open and ground inputs from the multifunction switch through circuits CRW20 (GY/YE) and CRW21 (YE/VT) to activate the wiper to the appropriate modes. The multifunction switch supplies a ground input to the rear wiper motor on CRW21 (YE/VT) when INT 1 is selected. The multifunction switch supplies ground to the rear wiper motor on CRW21 (YE/VT) and CRW20 (GY/YE) when INT 2 is selected.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Rear window wiper motor
- Multifunction switch



PINPOINT TEST D: THE WIPERS STAY ON CONTINUOUSLY - REAR WINDOW

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D1 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 D2.

No
INSTALL a new multifunction switch. REFER to Steering Column.

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D2 CHECK CIRCUITS CRW20 (GY/YE) AND CRW21 (YE/VT) FOR A SHORT TO GROUND


- Disconnect: Rear Window Wiper Motor C4323.
- Measure the resistance between rear window wiper motor C4323-5, circuit CRW20 (GY/YE), harness side and ground; and between rear window wiper motor C4323-1, circuit CRW21 (YE/VT), harness side and ground.




- Are the resistances greater than 10,000 ohms?

Yes
GO to D3.

No
REPAIR the circuit(s) in question. TEST the system for normal operation.

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D3 CHECK FOR CORRECT WIPER MOTOR OPERATION


- Disconnect all wiper motor connectors.
- Check for:
- corrosion.
- pushed-out pins.
- Connect all 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 rear window wiper motor. REFER to Wiper Motor - Rear Window Wiper Motor - Rear Window.

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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