Ignition Switch: Notes

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.

When the ignition lock cylinder is turned using the key, a mechanical connection positions the ignition switch to the desired position. The available ignition switch positions are:

OFF
ACC
RUN
START

When placed in any position other than OFF, the ignition switch provides fused battery voltage inputs to the Body Control Module (BCM). When placed in the START position, the ignition switch also provides fused battery voltage input to the PCM. 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 AUTOMATIC TRANSAXLE/ TRANSMISSION EXTERNAL CONTROLS .