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Pinpoint Test V : The DSM Does Not Respond To The Scan Tool

WARNING: This page is about a different car, the 2018 Lincoln MKT. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery, Mounting and Cables .

  1. V1 CHECK THE DSM VOLTAGE SUPPLY CIRCUITS FOR AN OPEN

    • Ignition OFF.

    • Disconnect: DSM C341A .

    • Disconnect: DSM C341B .

    • Ignition ON.

    • Measure the voltage  between:
      Positive Lead Negative Lead
      Pin Circuit Pin Circuit
      C341A-1 CBX05 (VT/RD) - Ground

    1. GFD232165Courtesy of FORD MOTOR COMPANY

    • Measure the voltage  between:
      Positive Lead Negative Lead
      Pin Circuit Pin Circuit
      C341B-1 CBX03 (BU/RD) - Ground

    1. GFD232166Courtesy of FORD MOTOR COMPANY

    Are the voltages greater than 11 volts? 

    Yes  GO to  V2.
    No  VERIFY the BJB fuse 23 (30A) or BCM fuse 7 (7.5A) is OK. If OK, REPAIR the circuit in question. If not OK, REFER to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify the possible causes of the circuit short.

  2. V2 CHECK THE DSM GROUND CIRCUITS FOR AN OPEN

    • Ignition OFF.

    • Disconnect: Negative Battery Cable.

    • Measure the resistance  between:
      Positive Lead Negative Lead
      Pin Circuit Pin Circuit
      C341A-2 GD906 (BK/GY) - Ground

    1. GFD232165Courtesy of FORD MOTOR COMPANY

    • Measure the resistance  between:
      Positive Lead Negative Lead
      Pin Circuit Pin Circuit
      C341B-24 GD905 (BK/GN) - Ground

    1. GFD232166Courtesy of FORD MOTOR COMPANY

    Are the resistances less than 3 ohms? 

    Yes  GO to  V3.
    No  REPAIR the circuit in question.

  3. V3 CHECK THE MS-CAN CIRCUITS BETWEEN THE DSM AND THE DLC FOR AN OPEN

    • Disconnect: DSM C341D .

    • Measure the resistance  between:
      Positive Lead Negative Lead
      Pin Circuit Pin Circuit
      C341D-10 VDB06 (GY/OG) C251-3 VDB06 (GY/OG)
      C341D-9 VDB07 (VT/OG) C251-11 VDB07 (VT/OG)

    1. GFD232167Courtesy of FORD MOTOR COMPANY

    Are the resistances less than 3 ohms? 

    Yes  GO to  V4.
    No  REPAIR the circuit in question.

  4. V4 CHECK FOR CORRECT DSM OPERATION

    • Disconnect all the DSM connectors.

    • Repair:

      • corrosion (replace connector or terminals - clean module pins)

      • damaged or bent pins - replace terminals/pins

      • pushed-out pins - replace pins as necessary

    • Connect all the DSM connectors and make sure they seat correctly.

    • Operate the system and verify the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, discontinue this test and follow TSB instructions. If no TSBs address this concern, INSTALL a new DSM. REFER to DRIVER SEAT MODULE (DSM) .
    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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