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Pinpoint Test F: The Vehicle Dynamics Module (VDM) Does Not Respond To The Scan Tool

WARNING: This page is about a different car, the 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: 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 VDM VOLTAGE SUPPLY CIRCUITS FOR AN OPEN 
    • Key in OFF position.
    • Disconnect the scan tool cable from the data link connector (DLC).
    • Disconnect: VDM C2131a
    • Key in ON position.
    • Measure the voltage between the VDM, harness side and ground as follows:
      Connector-Pin Circuit
      C2131a-11 418 (DG/YE)
      C2131a-12 418 (DG/YE)
      C2131a-3 1003 (GY/YE)
    • Are the voltages greater than 10 volts? 
    1. YES  : Go to  F2.
    2. NO  : VERIFY the battery junction box (BJB) fuse 13 (10A) and the central junction box (CJB) fuse 13 (10A) is OK. If OK, REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
  2. F2 CHECK THE VDM GROUND CIRCUITS FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between the VDM, harness side and ground as follows:
      Connector-Pin Circuit
      C2131a-5 57 (BK)
      C2131a-14 57 (BK)
    • 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 CAN CIRCUITS BETWEEN THE DLC AND THE VDM FOR AN OPEN 
    • Measure the resistance between the VDM C2131a-10, circuit 1827 (WH/LG), harness side and the DLC C251-6, circuit 1827 (WH/LG), harness side.
      • Fig 1: Checking Circuit For Open
      GF0014645Courtesy of FORD MOTOR CO.
    • Measure the resistance between the VDM C2131a-9, circuit 1828 (PK/LG), harness side and the DLC C251-14, circuit 1828 (PK/LG) harness side.
      • Fig 2: Checking Circuit For Open
      GF0014646Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  F4.
    2. NO  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
  4. F4 CHECK FOR CORRECT VDM OPERATION 
    • Disconnect all the VDM connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the VDM 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 VDM. REFER to VEHICLE DYNAMIC SUSPENSION 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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