Pinpoint Test F: The Intermittent Wiper Speed Does Not Operate Correctly - Rear Window

Wipers and Washers

Pinpoint Tests

Pinpoint Test F: The Intermittent Wiper Speed Does Not Operate Correctly - 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:
- Multifunction switch
- Rear window wiper motor



PINPOINT TEST F: THE INTERMITTENT WIPER SPEED DOES NOT OPERATE CORRECTLY - REAR WINDOW

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F1 VERIFY REAR WASHER PUMP OPERATION


- Ignition ON.
- Activate the rear washer pump.
- Does the rear washer pump activate?

Yes
GO to F2.

No
Go To Pinpoint Test H to diagnose the inoperative washer pump. Pinpoint Test H: The Washer Pump Is Inoperative

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F2 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 F3.

No
INSTALL a new multifunction switch.

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F3 CHECK FOR A SHORT BETWEEN CIRCUITS CRW20 (GY/YE) AND CRW21 (YE/VT)


- Measure the resistance between rear window wiper motor C476-3, circuit CRW20 (GY/YE), harness side and rear window wiper motor C476-7, circuit CRW21 (YE/VT), harness side.




- Is the resistance greater than 10,000 ohms?

Yes
GO to F4.

No
REPAIR the circuit. TEST the system for normal operation.

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F4 CHECK FOR CORRECT WIPER MOTOR OPERATION


- Disconnect all wiper motor connectors.
- Check for:
- liftgate open.
- 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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