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

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.
  1. G1 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
      G06071243Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to  G3.
    • No  : GO to G2.
  2. G2 CHECK THE WIPER MOTOR "ON" INPUT CIRCUIT TO THE WINDSHIELD WIPER MOTOR 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); harness side.
      • SJB C2280F-8 circuit CRW01 (WH), harness side and ground.
        Fig 2: Measuring Resistance Between SJB C2280F-8 And Wiper Motor C125-2 Circuit CRW01 (WH)
        G06071244Courtesy 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  G4.
    • No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  3. G3 CHECK THE WIPER ACTIVATED HEADLAMPS OPERATION 
      NOTE: When performing the following test, the light sensor must have enough light to have the headlamps deactivated.
      Fig 3: Connecting Fused Jumper Wire Between Wiper Motor C125-2, Circuit CRW01 (WH) And Ground
      G06393220Courtesy of FORD MOTOR CO.
    • Connect a fused jumper wire between wiper motor C125-2, circuit CRW01 (WH), harness side and ground.
    • Do the headlamps turn on within 10 seconds? 
    • Yes  : INSTALL a new wiper motor. REFER to WIPER MOTOR  in this service information. CLEAR the DTCs. REPEAT the self-test.
    • No  : GO to G4.
  4. G4 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 the appropriate MULTIFUNCTION ELECTRONIC MODULES -- MKS article. 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.
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