Principles of Operation: Autolock

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

The autolock feature locks all the doors when all the doors, including the liftgate, are closed, the brake pedal is pressed with the key in ON position, and vehicle speed then exceeds 8 km/h (5 mph) or higher. This feature relocks the doors (if any doors were open) after the brake pedal is pressed, once all the doors are read as closed and vehicle speed then exceeds 8 km/h (5 mph). Door ajar switches are wired directly to the vehicle security module. The autolock feature can be enabled/disabled through module configuration, the ignition switch, and the keyless entry keypad. The auto-lock feature also uses inputs from the key position, the brake pedal position (BPP) switch and vehicle speed through the universal asynchronous receiver-transmitter (UART)-based protocol (UBP) network.