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

Wipers and Washers

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

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

- Multifunction switch

- Rear window wiper motor

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

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.

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

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.

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

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




Is the resistance greater than 10,000 ohms?

Yes
GO to F4.

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

F4 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 .

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.