Pinpoint Test A: The Wipers Are Inoperative

WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: 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.

A1 CHECK WIPER MOTOR GROUND
- Ignition OFF.
- Disconnect: Wiper Motor C125.
- Measure the resistance between front wiper motor C125-4, circuit GD121 (BK/YE), harness side and ground.
  
  Fig 1: Checking Circuit
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes: GO to A2.
- No: REPAIR the circuit. TEST the system for normal operation.
A2 CHECK WIPER MOTOR FOR VOLTAGE
- Ignition ON.
- With the multifunction switch in the low position, measure the voltage between wiper motor C125-5, circuit CRW16 (GY/BN), harness side and ground.
  
  Fig 2: Measuring Voltage Between Wiper Motor C125-5 & Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes: INSTALL a new wiper motor. REFER to Removal and Installation . TEST the system for normal operation.
- No: GO to A3.
A3 CHECK WIPER MOTOR HIGH/LOW CIRCUITS FOR AN OPEN
- Ignition OFF.
- Disconnect: Wiper/Washer Module C2157.
- Measure the resistance between wiper/washer module C2157-4, circuit CRW16 (GY/BN), harness side and wiper motor C125-5, circuit CRW16 (GY/BN), harness side; and between wiper/washer module C2157-11, circuit CRW15 (BN/WH), harness side and wiper motor C125-3, circuit CRW15 (BN/WH), harness side.
  
  Fig 3: Checking Circuit(s)
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
- Yes: GO to A4.
- No: REPAIR the circuit(s). TEST the system for normal operation
A4 CHECK WIPER/WASHER MODULE FOR VOLTAGE
- Ignition ON.
- Measure the voltage between wiper/washer module C2157-9, circuit SBB09 (RD), harness side and ground; and between wiper/washer module C2157-10, circuit CBP45 (YE), harness side and ground.
  
  Fig 4: Checking Circuit
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes: GO to A5.
- No: VERIFY Battery Junction Box (BJB) fuse 9 (20A) and Smart Junction Box (SJB) fuse 45 (5A) are OK. If OK, REPAIR the circuit. TEST the system for normal operation.
  If not OK, REFER to the appropriate SYSTEM WIRING DIAGRAMS article to identify possible causes of the circuit short. REPAIR the circuit. TEST the system for normal operation.
A5 CHECK WIPER/WASHER MODULE FOR GROUND
- Ignition OFF.
- Measure the resistance between wiper/washer module C2157-12, circuit GD121 (BK/YE), harness side and ground.
  
  Fig 5: Checking Circuit
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes: GO to A6.
- No: REPAIR the circuit. TEST the system for normal operation.
A6 CHECK THE MULTIFUNCTION SWITCH
- Disconnect: Multifunction Switch C202.
- Carry out the Multifunction Switch Component Test.
  Refer to COMPONENT TESTING (Except Hybrid) and/or COMPONENT TESTING (Hybrid) for component testing.
- Did the multifunction switch pass the component test?
- Yes: GO to A7.
- No: INSTALL a new multifunction switch. REFER to REMOVAL AND INSTALLATION .
A7 CHECK MULTIFUNCTION SWITCH FOR GROUND
- Measure the resistance between multifunction switch C202-15, circuit GD116 (BK/VT), harness side and ground.
  
  Fig 6: Checking Circuit
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes: GO to A8.
- No: REPAIR the circuit. TEST the system for normal operation.
A8 CHECK THE WIPER/WASHER MODULE FOR PROPER OPERATION

Check for:
- corrosion.
- pushed-out pins.
Connect the wiper/washer module connector and make sure it is seated correctly, and reconnect the related wiper components.
Operate the system and verify the concern is still present.
Is the concern still present?

Yes: INSTALL a new wiper/washer module. REFER to Removal and Installation .
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.