Pinpoint Test B: The Wipers Are Inoperative - Rear Window
Wipers and Washers
Pinpoint Tests
Pinpoint Test B: The Wipers are Inoperative - 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 power through circuit SBP19 (BU/RD) and circuit CBP43 (GY). The rear window wiper motor is grounded through circuit GD183 (BK/WH). 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:
- Fuse(s)
- Wiring, terminals or connectors
- Rear window wiper motor
- Multifunction switch
PINPOINT TEST B: THE WIPERS ARE INOPERATIVE - 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.
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B1 CHECK CIRCUITS SBP19 (BU/RD) AND CBP43 (GY) FOR VOLTAGE
- Ignition OFF.
- Disconnect: Rear Window Wiper Motor C476.
- Ignition ON.
- Measure the voltage between ground and rear window wiper motor:
- C476-4, circuit SBP19 (BU/RD), harness side.
- C476-8, circuit CBP43 (GY), harness side.
- Are the voltages greater than 10 volts?
Yes
GO to B2.
No
VERIFY Smart Junction Box (SJB) fuse 19 (25A) and SJB fuse 43 (10A) are OK. If OK, REPAIR the circuit(s) in question. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. TEST the system for normal operation.
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B2 CHECK CIRCUIT GD183 (BK/WH) FOR AN OPEN
- Ignition OFF.
- Measure the resistance between rear window wiper C476-1, circuit GD183 (BK/WH), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to B3.
No
REPAIR the circuit(s) in question. TEST the system for normal operation.
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B3 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 B4.
No
INSTALL a new multifunction switch.
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B4 CHECK CIRCUIT GD114 (BK/BU) FOR AN OPEN
- Measure the resistance between multifunction switch C202-15, circuit GD114 (BK/BU), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to B5.
No
REPAIR the circuit. TEST the system for normal operation.
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B5 CHECK CIRCUIT CRW21 (YE/VT) FOR AN OPEN
- Measure the resistance between multifunction switch C202-13, circuit CRW21 (YE/VT), harness side and rear window wiper C476-7, circuit CRW21 (YE/VT), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to B6
No
REPAIR the circuit. TEST the system for normal operation.
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B6 CHECK FOR CORRECT WIPER MOTOR OPERATION
- Disconnect all wiper motor connectors.
- Check for:
- liftgate glass 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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