Starting System: Overview
WARNING: This page is about a different car, the 2013 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
The starting system controls the cranking of the engine. The starter motor is enabled by the starter relay when the relay is activated by the PCM. The ignition switch provides voltage to the BCM and PCM to initiate cranking of the engine.
The starting system controls the starting of the vehicle. The starter motor is enabled by the starter relay when the relay is activated by the PCM. The PCM receives inputs from the start/stop switch, BCM and TR sensor before activating the starter relay to crank the engine.