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 (Escape/Mariner, Escape Hybrid/Mariner Hybrid), 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 circuit CRW21 (YE/VT) when INT 1 is selected. The multifunction switch supplies ground to the rear wiper motor on circuits CRW21 (YE/VT) and CRW20 (GY/YE) when INT2 is selected.
This pinpoint test is intended to diagnose the following:
- Rear window wiper motor
- Multifunction switch
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. 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. REFER to Steering Column.
-------------------------------------------------
F3 CHECK FOR A SHORT BETWEEN CIRCUITS CRW20 (GY/YE) AND CRW21 (YE/VT)
- Measure the resistance between rear window wiper C476-3, circuit CRW20 (GY/YE), harness side and rear window wiper 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.
-------------------------------------------------
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 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.
-------------------------------------------------