Operation - Ignition Sense - Pcm Input
WARNING: This page is about a different car, the 2005 Dodge SX, 2005 Dodge SRT-4, and 2005 Dodge Neon. However, it is still accessible from the selected car via links, so may be relevant.
The ignition sense input informs the Powertrain Control Module (PCM) that the ignition switch is in the crank or run position.