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

WARNING: This page is about a different car, the 2005 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.

D1 CHECK THE DSM C341C FOR DAMAGE
- Key in OFF position.
- Disconnect: DSM C341c.
- Inspect the DSM C341c for damage.
- Are the DSM C341c OK?
- Yes : GO to D2.
- No : REPAIR the DSM C341c as necessary. CARRY OUT the data link diagnostics test.
D2 CHECK CIRCUIT 1906 (VT) BETWEEN THE DATA LINK CONNECTOR (DLC) C251 AND THE DSM C341C 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 1: Measuring Resistance Between DSM C341c-2, Circuit 1906 (VT), Harness Side And DLC C251-3, Circuit 1906 (VT), Harness Side
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to D3.
- No : REPAIR the circuit. CARRY OUT the data link diagnostics test.
D3 CHECK FOR CORRECT DSM OPERATION
- Disconnect all the DSM connectors.
- Check for:
  - Corrosion
  - Push-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?
- Yes : INSTALL a new DSM. REFER to MULTIFUNCTION ELECTRONIC MODULES . CARRY OUT the data link diagnostics test.
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the diagnostic trouble codes (DTCs). REPEAT the self-test. CARRY OUT the data link diagnostics test.