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 Lincoln Town Car. 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.
- Inspect the DSM C341c for damage.
- Is the DSM C341c OK
- Yes : GO to D2.
- No : REPAIR the DSM C341c. CARRY OUT the diagnostic tool data link test.
D2 CHECK CIRCUITS 914 (TN/OG) AND 915 (PK/LB) FOR AN OPEN BETWEEN THE DATA LINK CONNECTOR (DLC) C251 AND THE DSM C341C
- Measure the resistance between the DSM C341c pin 25, circuit 914 (TN/OG), harness side and the DLC C251 pin 2, circuit 914 (TN/OG), harness side.
  
  Fig 1: Measuring Resistance Between DSM C341c Pin 25, Circuit 914 (TN/OG), Harness Side And DLC C251 Pin 2, Circuit 914 (TN/OG), Harness Side
  Courtesy of FORD MOTOR CO.
- Measure the resistance between the DSM C341c pin 26, circuit 915 (PK/LB), harness side and the DLC C251 pin 10, circuit 915 (PK/LB), harness side.
  
  Fig 2: Measuring Resistance Between DSM C341c Pin 26, Circuit 915 (PK/LB), Harness Side And DLC C251 Pin 10, Circuit 915 (PK/LB), Harness Side
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
- Yes : GO to D3.
- No : REPAIR the circuit in question. CARRY OUT the diagnostic tool data link test.
D3 CHECK FOR CORRECT DSM OPERATION
- Disconnect all the DSM connectors.
- Check for:
  - corrosion
  - 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?
- Yes : INSTALL a new DSM. Refer to MULTIFUNCTION ELECTRONIC MODULES . CARRY OUT the diagnostic tool data link test.
- 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 self-test. CARRY OUT the diagnostic tool data link test.