Pinpoint Test F: The Headlamps Do Not Illuminate When The Wipers Are On

WARNING: This page is about a different car, the 2013 Ford Mustang. 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.

F1 CHECK THE WIPER MOTOR ON INPUT VOLTAGE TO THE WINDSHIELD WIPER MOTOR
- Disconnect: Wiper Motor C125.
- Ignition ON.
- Turn the headlamp control switch to the AUTOLAMP position.
- Measure the voltage between wiper motor C125-2 circuit CRW01 (WH), harness side and ground.
  
  Fig 1: Measuring Voltage Between Wiper Motor C125-2 Circuit CRW01 (WH) And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : GO to F3.
- No : GO to F2.
F2 CHECK CIRCUIT CRW01 (WH) FOR AN OPEN OR SHORT TO GROUND
- Ignition OFF.
- Disconnect: SJB C2280F.
- Measure the resistance between SJB C2280F-8 circuit CRW01 (WH), harness side and wiper motor C125-2 circuit CRW01 (WH); and between SJB C2280F-8 circuit CRW01 (WH), harness side and ground.
  
  Fig 2: Measuring Resistance Between SJB C2280F-8 Circuit CRW01 (WH) And Wiper Motor C125-2 Circuit CRW01 (WH)
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms between the SJB and wiper motor and greater than 10, 000 ohms between the SJB and ground?
- Yes : GO to F4.
- No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
F3 CHECK THE WIPER ACTIVATED HEADLAMPS OPERATION
- NOTE: When performing the following test, the light sensor must have enough light to have the headlamps deactivated.
  
  Connect a fused jumper wire between wiper motor C125-2 circuit CRW01 (WH), harness side and ground.
  
  Fig 3: Connecting Fused Jumper Wire Between Wiper Motor C125-2 Circuit CRW01 (WH) And Ground
  Courtesy of FORD MOTOR CO.
- Do the headlamps turn on within 10 seconds?
- Yes : INSTALL a new wiper motor. REFER to WIPER MOTOR . CLEAR the DTCs. REPEAT the self-test.
- No : GO to F4.
F4 CHECK FOR CORRECT MODULE OPERATION
- Disconnect all the SJB connectors.
- Check for:
  - corrosion.
  - pushed-out pins.
- Connect all the SJB connectors and make sure they are seated correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES . CLEAR the DTCs. REPEAT the self-test.
- No : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.