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 Milan, 2006 Lincoln Zephyr, and 2006 Ford Fusion. 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 C3299C FOR DAMAGE
- Key in OFF position.
- Disconnect: DSM C3299c.
- Inspect the DSM C3299c for damage.
- Is the DSM C3299c OK?
Yes : GO to I2.

No : REPAIR the DSM C3299c as necessary. CONNECT the DSM C3299c. CARRY OUT the data link diagnostics test.
I2 CHECK THE MEDIUM SPEED CAN CIRCUITS BETWEEN THE DLC AND THE DSM FOR AN OPEN
- 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 1: Checking Medium Speed CAN Circuits Between DLC And DSM For Open (1 Of 2)
  Courtesy 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.
  
  Fig 2: Checking Medium Speed CAN Circuits Between DLC And DSM For Open (2 Of 2)
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
Yes : GO to I3.

No : REPAIR the circuit. CONNECT the DSM C3299C. CARRY OUT the data link diagnostics test.
I3 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 CONTROL MODULES . CLEAR the diagnostic trouble codes (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.