Theory Of Operation
WARNING: This page is about a different car, the 2014 Dodge Journey. However, it is still accessible from the selected car via links, so may be relevant.
The Body Control Module (BCM) receives the network communication message from the Radio Frequency (RF) Hub indicating run/start operation is requested. The BCM provides a voltage output through the run/start relay control circuit, which connects to the coil side of the Run/Start Relay.