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Pinpoint Test Ab: DTC B1D64:87, B1D65:87

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.
  1. AB1 CHECK FOR VOLTAGE TO THE HEADLAMP 
    • Ignition OFF.
    • Disconnect: LH Headlamp Assembly C1021 (DTC B1D64:87).
    • Disconnect: RH Headlamp Assembly C1041 (DTC B1D65:87).
    • Ignition ON.
    • Measure the voltage between the LH headlamp C1021-5, circuit CBP42 (GN), harness side and ground; or between the RH headlamp C1041-5, circuit CBP42 (GN), harness side and ground.
      Fig 1: Measuring Voltage Between LH Headlamp C1021-5 & Ground
      G06257408Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes:  GO to  AB2.
    • No:  REPAIR circuit CBP42 (GN) for an open. CLEAR the DTCs. REPEAT the self-test.
  2. AB2 CHECK FOR VOLTAGE TO THE HEADLAMP USING THE CONNECTOR GROUND 
    • Measure the voltage between the LH headlamp C1021-5, circuit CBP42 (GN), harness side and the LH headlamp C1021-3, circuit GD121 (BK/YE), harness side; or between the RH headlamp C1041-5, circuit CBP42 (GN), harness side and the RH headlamp C1041-3, circuit GD123 (BK/GY), harness side.
      Fig 2: Measuring Voltage Between LH Headlamp C1021-5 & C1021-3
      G06257409Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes:  GO to  AB3.
    • No:  REPAIR circuit GD121 (BK/YE) (LH headlamp) or circuit GD123 (BK/GY) (RH headlamp) for an open. CLEAR the DTCs. REPEAT the self-test.
  3. AB3 CHECK THE COMMUNICATION CIRCUIT BETWEEN THE HCM AND THE HEADLAMP FOR AN OPEN 
    • Ignition OFF.
    • Disconnect: HCM C1600.
    • For the LH headlamp, measure the resistance between the HCM C1600-17, circuit VLF32 (YE), harness side and the LH headlamp C1021-2, circuit VLF32 (YE), harness side.
      Fig 3: Measuring Resistance Between HCM C1600-17 & LH Headlamp C1021-2
      G06257410Courtesy of FORD MOTOR CO.
    • For the RH headlamp, measure the resistance between the HCM C1600-18, circuit VLF33 (BU), harness side and the RH headlamp C1041-2, circuit VLF33 (BU), harness side.
      Fig 4: Measuring Resistance Between HCM C1600-18 & RH Headlamp C1041-2
      G06257411Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes:  GO to  AB4.
    • No:  REPAIR circuit VLF32 (YE) (LH headlamp) or circuit VLF33 (BU) (RH headlamp) for an open. CLEAR the DTCs. REPEAT the self-test.
  4. AB4 CHECK FOR CORRECT HCM OPERATION 
    • Disconnect all the HCM connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the HCM 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 HCM. REFER to Removal and Installation . TEST the system for normal operation.
    • No:  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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