Ignition Switch

WARNING: This page is about a different car, the 2012 Ford Pickup, 2012 Ford F550 Super Duty, 2012 Ford F450 Super Duty, and 2012 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

The ignition switch is controlled by the ignition lock cylinder and a key. The ignition lock cylinder and ignition switch are connected mechanically, turning the lock cylinder places the switch into the desired position. The available switch positions are:

OFF
ACC
RUN
START

When the lock cylinder is turned from the OFF position, the ignition switch provides voltage inputs to the Body Control Module (BCM), the PCM and the Brake Shift Interlock Actuator (BSIA) based on the specific position selected. The ignition switch contains a key-in-ignition input that allows the BCM to detect when the key has been inserted in the ignition, to initiate the module wake up cycle. This information is also used by the BCM for the brake shift interlock system. For information on the brake shift interlock system, refer to A/T EXTERNAL CONTROL -- F250-F550 SUPER DUTY .