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

WARNING: This page is about a different car, the 2006 Mercury Montego, 2006 Ford Freestyle, and 2006 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.

I1 CHECK THE DSM C341c FOR DAMAGE
- Key in OFF position.
- Disconnect: DSM C341c.
- Inspect the DSM C341c for damage.
- Is the DSM C341c OK?
Yes: GO to I2.

No: REPAIR the DSM C341c as necessary. CARRY OUT the data link diagnostics test.
I2 CHECK THE MEDIUM SPEED CAN CIRCUITS BETWEEN THE DLC AND THE DSM FOR AN OPEN
- Key in OFF position.
- Measure the resistance between the DSM C341c-11, circuit 2180 (WH/BK), harness side and the DLC C251-3, circuit 2180 (WH/BK), harness side; and between the DSM C341c-12, circuit 2181 (BK/YE), harness side and the DLC C251-11, circuit 2181 (BK/YE), harness side.
  
  Fig 1: Checking Medium Speed CAN Circuits Between DLC & DSM For Open
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
Yes: GO to I3.

No: REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
I3 CHECK FOR CORRECT DSM OPERATION
- Disconnect all the DSM module 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 REMOVAL AND INSTALLATION . CLEAR the DTCs. REPEAT the self-test. 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 DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.