WARNING: This page is about a different car, the 2004 Lincoln Navigator and 2004 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

The vehicle security module is on the universal asynchronous receiver-transmitter (UART)-based protocol (UBP) communication network. To support several vehicle subsystems, the module permits intermodule and diagnostic tool communications.

The vehicle security module controls the power door lock system. The module monitors the door lock/unlock switch inputs from the interior door lock switches. When the module receives an unlock/lock command from any door lock control switch, the module will activate the door lock actuators. The module also controls the following remote lock/unlock features:

Remote keyless entry (RKE) transmitter lock/unlock
Panic alarm
Keyless entry keypad

For additional information on the power door lock system, refer to HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS .

The vehicle security module controls the autolamp subsystem. The autolamp subsystem provides light - sensitive automatic on/off control of the headlamps and parking lamps. For additional information, refer to EXTERIOR LIGHTING .

The third row power-fold seat relays are also controlled by the vehicle security module. This allows the seats to be adjusted by pressing one of the third row power-fold seat switches. For additional information, refer to SEATING .

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Principles of Operation

Use the Manual With the Right Hardware

When to See a Mechanic