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Pinpoint Test C: C1005:52

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  1. Refer to POWER TAILGATE/RETRACTABLE RUNNING BOARDS for schematic and connector information.

    Normal Operation and Fault Conditions 

    THE LHPRB DOES NOT OPERATE CORRECTLY - DOES NOT DEPLOY/STOW, OR REVERSES DIRECTION

    The LH Hall-effect sensor (Integral to the PRB motor) receives a regulated 10 volt power supply, and ground from the DSM. The DSM monitors PRB motor movement using the Hall-effect sensor signal from the PRB motor. The DSM receives door ajar status of each door over the MS-CAN. Door ajar signals trigger the DSM to deploy or stow the LHPRB.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    DSM C1005:52 Left Power Running Board Deploy: Not Activated Left Power Running Board Deploy: Commanded Position Not Reachable

    Possible Sources 

    • Wiring, terminals or connectors
    • Door ajar signal concern
    • Message center concern
    • Foreign material causing blockage of PRB movement
    • LHPRB motor
    • DSM

    Visual Inspection and Pre-checks 

    • Foreign material causing blockage of PRB movement

  2. C1 CHECK FOR DSM (DRIVER FRONT SEAT MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

    • Using a diagnostic scan tool, retrieve all Diagnostic Trouble Codes (DTCs) for the DSM.

    Are any Diagnostic Trouble Codes (DTCs) present? 

    Yes  REPAIR the DTC concern.
    No  GO to  C2

  3. C2 CHECK THE OPERATION OF THE POWER RUNNING BOARDS -- AUTOMATIC MODE

    NOTE: When a door is closed, a short delay is normal before the PRB retracts. This delay feature is to reduce excessive PRB cycling if a door is closed and another door on the same side is then opened (for example if a passenger is moving from the front seat to the rear seat).

    • Set the PRB system to the AUTO (enabled) mode.

    • Open and close the LH front door. The LHPRB should deploy when the door is open, and retract when the door is closed.

    • Open and close the LH rear door. The LHPRB should deploy when the door is open, and retract when the door is closed.

    Does the LHPRB operate correctly? 

    Yes  GO to  C3
    No  GO to  C4

  4. C3 CHECK THE OPERATION OF THE POWER RUNNING BOARDS -- MANUAL MODE

    • Set the PRB system to the OUT mode. Both Power Running Boards (PRBs) should deploy.

    Do both Power Running Boards (PRBs) deploy? 

    Yes  The system is operating as designed. REFER the customer to the Owner's Literature for correct PRB system operation.
    No  GO to  C4

  5. C4 CHECK THE POWER RUNNING BOARDS FOR FOREIGN MATERIAL

    • Check the step area and door sill of the RHPRB for foreign material or blockage.

    • Check the LHPRB hinge points for any corrosion that may cause binding.

    Is any blockage or corrosion present? 

    Yes  SET the PRB system to the OUT mode and REMOVE the foreign material or corrosion. If necessary, a power washer can be used; however, avoid direct spray to the PRB motor. TEST the system for normal operation. REFER the customer to the Owner's Literature for correct cleaning instructions.
    No  GO to  C5

  6. C5 CHECK THE DOOR AJAR SWITCH OPERATION

    • Ignition ON.

    • Open and close the LH front and rear door, and verify the interior lights operate correctly and a door ajar message is noted on the vehicle message center. The interior lights should turn on when the door is opened and off when the door is closed. The message center should display door ajar when the doors are open and the door ajar message should turn off when the door is closed.

    Yes  GO to  C6
    No  If the interior lights do not light when one of the LH doors are opened, DIAGNOSE the interior lighting concern. REFER to: Interior Lighting . If the interior lights do operate as expected and the door ajar message does not display on the message center when one of the LH doors are opened, DIAGNOSE the message center concern. REFER to: Instrumentation, Message Center and Warning Chimes .

  7. C6 CHECK THE LEFT SIDE HALL-EFFECT SENSOR POWER AND RETURN CIRCUITS

    NOTE: Use a meter with a min-max feature or recording capabilities to obtain accurate measurements. The DSM disables the voltage output immediately if the PRB motor is not present.

    • Ignition OFF.

    • Disconnect LHPRB motor C3185A.

    • Ignition ON.

    • Make sure the PRB is set to AUTO in the vehicle message center.

    • Close all vehicle doors.

    • Connect the meter to the LHPRB motor electrical connector, harness side.

    • Set the meter to measure DC (direct current) voltage.

    • Set the meter range to greater than 15 volts.

    • Enable the min-max or recording feature on the meter.

    • NOTE: Make sure all test connections are made at the PRB motor before the door is opened.

      Open any LH side door.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3185A-4
      GFD561509Courtesy of FORD MOTOR COMPANY
      		 C3185A-6

    Is the voltage between 7 and 10.5 volts? 

    Yes  REPLACE the LHPRB motor. REFER to: Power Running Board (PRB) Motor .
    No  GO to  C7

  8. C7 CHECK LEFT HALL-EFFECT SENSOR POWER CIRCUIT FOR AN OPEN

    NOTE: Use a meter with a min-max feature or recording capabilities to obtain accurate measurements. The DSM disables the voltage output immediately if the PRB motor is not present.

    • Ignition OFF.

    • Disconnect RHPRB motor C3186.

    • Ignition ON.

    • Close all vehicle doors.

    • Connect the meter to the LHPRB motor electrical connector, harness side.

    • Set the meter to measure DC (direct current) voltage.

    • Set the meter range to greater than 15 volts.

    • Enable the min-max or recording feature on the meter.

    • NOTE: Make sure all test connections are made at the PRB motor before the door is opened.

      Open any LH side door.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3186A-4
      GFD561510Courtesy of FORD MOTOR COMPANY
      		 C3185A-4

    Is the resistance less than 3 ohms? 

    Yes  REPAIR the circuit.
    No  GO to  C8

  9. C8 CHECK LEFT SIDE HALL-EFFECT SENSOR RETURN CIRCUIT FOR AN OPEN

    NOTE: Use a meter with a min-max feature or recording capabilities to obtain accurate measurements. The DSM disables the voltage output immediately if the PRB motor is not present.

    • Close all vehicle doors.

    • Connect the meter to the LHPRB motor electrical connector, harness side.

    • Set the meter to measure DC (direct current) voltage.

    • Set the meter range to greater than 15 volts.

    • Enable the min-max or recording feature on the meter.

    • NOTE: Make sure all test connections are made at the PRB motor before the door is opened.

      Open any LH side door.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3186A-6
      GFD561510Courtesy of FORD MOTOR COMPANY
      		 C3185A-6

    Is the resistance less than 3 ohms? 

    Yes  REPAIR the circuit.
    No  REPLACE the LHPRB motor. REFER to: Power Running Board (PRB) Motor .
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