LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mercury >> 2009 >> Milan Base, 3.0 1, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1010 (Module Communications Network) >> Diagnostic Tests >> Communications Network >> Pinpoint Tests >> Pinpoint Test O: The Driver Seat Module (DSM) Does Not Respond To The Scan Tool >> Pinpoint Test O: The Driver Seat Module (DSM) Does Not Respond To The Scan Tool
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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

WARNING: This page is about a different car, the 2008 Mercury Milan, 2008 Lincoln MKZ, and 2008 Ford Fusion. 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. O1 CHECK THE VOLTAGE SUPPLY CIRCUIT SBB15 (WH/RD) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: DSM C3299c
    • Key in ON position.
      • Fig 1: Checking Voltage Supply Circuit SBB15 (WH/RD) For An Open
      GF0028122Courtesy of FORD MOTOR CO.
    • Measure the voltage between the DSM C3299c-1, circuit SBB15 (WH/RD), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  O2.
    2. NO  : VERIFY the battery junction box (BJB) fuse 15 (10A) is OK. If OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
  2. O2 CHECK CIRCUIT GD126 (BK/WH) FOR AN OPEN 
    • Key in OFF position.
      • Fig 2: Checking Circuit GD126 (BK/WH) For An Open
      GF0028123Courtesy of FORD MOTOR CO.
    • Measure the resistance between the DSM C3299c-13, circuit GD126 (BK/WH), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  O3.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
  3. O3 CHECK THE MS-CAN CIRCUITS BETWEEN THE DATA LINK CONNECTOR (DLC) AND THE DSM FOR AN OPEN 
      Fig 3: Measuring Resistance Between DSM C3299C-11, Circuit VDB06 (GY/OG) & DLC C251-3
      GF0028124Courtesy of FORD MOTOR CO.
    • Measure the resistance between the DSM C3299c-11, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness side.
      • Fig 4: Measuring Resistance Between DSM C3299C-12, Circuit VDB07 (VT/OG) & DLC C251-11
      GF0028125Courtesy of FORD MOTOR CO.
    • Measure the resistance between the DSM C3299c-12, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  O4.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
  4. O4 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. TEST the system for normal operation.
    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.
scientia non olet · About LEMON Manuals