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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 729 (Module Communications Network - F-150 & Mark LT) >> Diagnostic Tests >> Communications Network >> Pinpoint Tests >> Pinpoint Test F: The Driver Seat Module (DSM) Does Not Respond To The Scan Tool >> Pinpoint Test F: The Driver Seat Module (DSM) Does Not Respond To The Scan Tool

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

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. F1 CHECK THE DSM VOLTAGE SUPPLY CIRCUITS FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: DSM C341b and C341c
    • Key in ON position.
    • Measure the voltage between the DSM, harness side and ground as follows:
      Connector-Pin Circuit
      C341b-1 566 (DG)
      C341c-1 956 (OG/LG)
      • Fig 1: Checking DSM Voltage Supply Circuits For An Open
      GF0004709Courtesy of FORD MOTOR CO.
    • Are the voltages greater than 10 volts? 
    1. YES  : Go to  F2.
    2. NO  : VERIFY the CJB fuse 3 (7.5A) or fuse 109 (30A) are OK. If OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
  2. F2 CHECK THE DSM GROUND CIRCUITS FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between the DSM, harness side and ground as follows:
      Connector-Pin Circuit
      C341b-2 57 (BK)
      C341c-6 875 (BK/LB)
      • Fig 2: Checking DSM Ground Circuits For An Open
      GF0004710Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  F3.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
  3. F3 CHECK THE UBP NETWORK CIRCUIT 1906 (VT) BETWEEN THE DATA LINK CONNECTOR (DLC) AND THE DSM FOR AN OPEN 
    • Measure the resistance between the DSM C341c-2, circuit 1906 (VT), harness side and the DLC C251-3, circuit 1906 (VT), harness side.
      • Fig 3: Checking UPB Network Circuit Between DLC And DSM For Open
      GF0004711Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  F4.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
  4. F4 CHECK FOR CORRECT DSM OPERATION 
    • Disconnect all the DSM connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • 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? 
    1. YES  : INSTALL a new DSM. REFER to MULTIFUNCTION ELECTRONIC MODULES article. CLEAR the DTCs. REPEAT the network test with the scan tool.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.
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