Brake Shift Interlock System - Column
WARNING: This page is about a different car, the 2014 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
The brake shift interlock system prevents the transmission from being shifted from the PARK position until the brake pedal is applied. The brake shift interlock system consists of a Brake Shift Interlock Actuator (BSIA) mounted at the upper end of the steering column near the selector lever.