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PINPOINT TEST O : The DSM Does Not Respond To The Scan Tool

NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. REFER to Battery, Mounting and Cables

  1. O1 CHECK THE DSM VOLTAGE SUPPLY CIRCUITS FOR AN OPEN

    • Ignition OFF.
    • Disconnect: DSM C341A and C341B.
    • Ignition ON.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C341A-1
      GFD33595Courtesy of FORD MOTOR COMPANY
      		 Ground
      Positive Lead Measurement / Action Negative Lead
      C341B-1
      GFD33595Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the voltages greater than 11 volts? 

    Yes  GO to  O2.
    No  VERIFY the BCM fuse 7 (7.5) or BJB fuse 23 (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.

  2. O2 CHECK THE DSM GROUND CIRCUIT FOR AN OPEN

    • Disconnect: Negative Battery Cable.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C341A-2
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground
      Positive Lead Measurement / Action Negative Lead
      C341B-24
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the resistances less than 3 ohms? 

    Yes  GO to  O3.
    No  REPAIR the circuit in question.

  3. O3 CHECK THE MS-CAN CIRCUITS BETWEEN THE DSM AND THE MS-CAN FOR AN OPEN

    • Disconnect: DSM C341D.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C341D-10
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 C251-3
      C341D-9
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 C251-11

    Are the resistances less than 3 ohms? 

    Yes  CONNECT the negative battery cable. GO to  O4.
    No  REPAIR the circuit in question.

  4. O4 CHECK FOR CORRECT DSM OPERATION

    • Ignition OFF.
    • Disconnect and inspect the DSM connectors and related in-line connectors.
    • Repair:
      • corrosion (replace connector or terminals - clean module pins)
      • damaged or bent pins - replace terminals/pins
      • pushed-out pins - replace pins as necessary
    • Reconnect the DSM connectors and related in-line connectors. Make sure they seat and latch 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 Seating 1st Row .
    No  The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
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