Pinpoint Test B: The Wipers Are Inoperative - Rear Window
WARNING: This page is about a different car, the 2010 Lincoln MKX and 2010 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
- B1 CHECK CIRCUITS SBB19 (BU/RD) AND CBP43 (GY) FOR VOLTAGE
- Ignition OFF.
- Disconnect: Rear Window Wiper Motor C4218.
- Ignition ON.
- Measure the voltage between ground and rear window wiper motor:
- C4218-6. circuit SBP19 (BU/RD), harness side.
- C4218-8, circuit CBP43 (GY), harness side.
- Are the voltages greater than 10 volts?
- Yes: GO to B2 .
- No: VERIFY Smart Junction Box (SJB) fuses 19 (25A) and 43 (10A) are OK. If OK, REPAIR the circuit(s) in question. If not OK, REFER to the SYSTEM WIRING DIAGRAMS for Edge or SYSTEM WIRING DIAGRAMS for MKX to identify the possible causes of the circuit short. TEST the system for normal operation.
- B2 CHECK CIRCUIT GD149 (BK/GY) FOR AN OPEN
- Ignition OFF.
- Measure the resistance between rear window wiper C4218-5, circuit GD149 (BK/GY), 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.
- B3 CHECK THE MULTIFUNCTION SWITCH
- Ignition OFF.
- Disconnect: Multifunction Switch C202.
- Carry out the Multifunction Switch Component Test.
Refer to COMPONENT TESTING for component testing.
- Did the multifunction switch pass the component test?
- Yes: GO to B4 .
- No: INSTALL a new multifunction switch. REFER to STEERING COLUMN SWITCHES .
- B4 CHECK CIRCUIT GD116 (BK/VT) FOR AN OPEN
- Measure the resistance between multifunction switch C202-15, circuit GD116 (BK/VT), 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.
- 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 C4218-3, 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.
- B6 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.