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Pinpoint Test Ac : The Driver Seat Module (DSM) Does Not Respond To The Diagnostic Scan Tool

WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.

  1. AC1 CHECK THE DSM (DRIVER FRONT SEAT MODULE) VOLTAGE SUPPLY CIRCUITS FOR AN OPEN

    • Ignition OFF.

    • Disconnect: DSM C341B .

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C341B-3
      GFD271423Courtesy of FORD MOTOR COMPANY
      		 Ground
      C341B-5
      GFD271423Courtesy of FORD MOTOR COMPANY
      		 Ground
      C341B-6
      GFD271423Courtesy of FORD MOTOR COMPANY
      		 Ground
      C341B-9
      GFD271423Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the voltages greater than 11 volts? 

    Yes  GO to  AC2
    No  VERIFY BJB fuse 27 (40A) or fuse 77 (30A) is OK. If OK, REPAIR the circuit. If not OK, Refer to the Wiring Diagram Information to identify the possible causes of the circuit short.

  2. AC2 CHECK THE DSM (DRIVER FRONT SEAT MODULE) GROUND CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C341C-3
      GFD271422Courtesy of FORD MOTOR COMPANY
      		 Ground
      C341C-4
      GFD271422Courtesy of FORD MOTOR COMPANY
      		 Ground
      C341C-5
      GFD271422Courtesy of FORD MOTOR COMPANY
      		 Ground
      C341C-6
      GFD271422Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the resistances less than 3 ohms? 

    Yes  GO to  AC3
    No  REPAIR the circuit.

  3. AC3 CHECK THE MS-CAN (MEDIUM SPEED-CONTROLLER AREA NETWORK) CIRCUITS BETWEEN THE DSM (DRIVER FRONT SEAT MODULE) AND THE GWM (GATEWAY MODULE A) FOR AN OPEN

    • Disconnect: DSM C341F .

    • Disconnect: GWM C2431 .

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C341F-8
      GFD271422Courtesy of FORD MOTOR COMPANY
      		 C2431-23
      C341F-7
      GFD271422Courtesy of FORD MOTOR COMPANY
      		 C2431-22

    Are the resistances less than 3 ohms? 

    Yes  GO to  AC4
    No  REPAIR the circuit in question.

  4. AC4 CHECK FOR CORRECT DSM (DRIVER FRONT SEAT MODULE) OPERATION

    • Ignition OFF.

    • Disconnect and inspect all the DSM connectors.

    • Repair:

      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary

    • Reconnect the DSM connectors. Make sure they seat and latch correctly.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable service articles: TSB, General Service Bulletin (GSB), SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new DSM. REFER to: Driver Front Seat Module (DSM) .
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
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