Pinpoint Test A: The Vehicle Security Module 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.

A1 CHECK THE VEHICLE SECURITY MODULE C3008B FOR DAMAGE
- Key in OFF position.
- Disconnect: Vehicle Security Module C3008b.
- Inspect the vehicle security module C3008b for damage.
- Is the vehicle security module C3008b OK?
- Yes : GO to A2.
- No : REPAIR the vehicle security module C3008b as necessary. CARRY OUT the data link diagnostics test.
A2 CHECK CIRCUIT 1906 (VT) BETWEEN THE DLC C251 AND THE VEHICLE SECURITY MODULE C3008B FOR AN OPEN
- Measure the resistance between the DLC C251-3, circuit 1906 (VT), harness side and the vehicle security module C3008b-3, circuit 1906 (VT), harness side.
  
  Fig 1: Checking Circuit 1906 (VT) Between DLC C251 And Vehicle Security Module C3008b For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to A3.
- No : REPAIR the circuit. CARRY OUT the data link diagnostics test.
A3 CHECK FOR CORRECT VEHICLE SECURITY MODULE OPERATION
- Disconnect all the vehicle security module connectors.
- Check for:
  - Corrosion
  - Push-out pins
- Connect all the vehicle security module 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 vehicle security module. 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.