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

WARNING: This page is about a different car, the 2020 Lincoln Corsair. However, it is still accessible from the selected car via links, so may be relevant.
  1. Refer to MODULE COMMUNICATIONS NETWORK for schematic and connector information. Refer to CLIMATE CONTROLLED SEATS for schematic and connector information.

    Normal Operation and Fault Conditions 

    The DSM communicates on the MS-CAN.

    Possible Sources 

    • Fuse
    • Wiring, terminals and connector
    • DSM

    Visual Inspection and Pre-checks 

    • Verify BJB fuses 30 (30A) and 38 (30A) are OK.

  2. W1 CHECK THE DSM (DRIVER FRONT SEAT MODULE) VOLTAGE SUPPLY CIRCUITS FOR AN OPEN

    • Ignition OFF.

    • Disconnect: DSM C341A.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C341A-2
      GFD549339Courtesy of FORD MOTOR COMPANY
      		 Ground
      C341A-3
      GFD549339Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the voltages greater than 11 volts? 

    Yes  GO to  W2
    No  VERIFY BJB fuse 30 (30A) or 38 (30A) 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.

  3. W2 CHECK THE DSM (DRIVER FRONT SEAT MODULE) GROUND CIRCUITS FOR AN OPEN

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C341A-4
      GFD549340Courtesy of FORD MOTOR COMPANY
      		 Ground
      C341A-5
      GFD549340Courtesy of FORD MOTOR COMPANY
      		 Ground
      C341A-6
      GFD549340Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  GO to  W3
    No  REPAIR the circuit in question.

  4. W3 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 C341E.

    • Disconnect GWM C2431.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C341E-5
      GFD549340Courtesy of FORD MOTOR COMPANY
      		 C2431-23
      C341E-15
      GFD549340Courtesy of FORD MOTOR COMPANY
      		 C2431-22

    Are the resistances less than 3 ohms? 

    Yes  GO to  W4
    No  REPAIR the circuit in question.

  5. W4 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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