Theory Of Operation
WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
The Body Control Module (BCM) will disable the adjustable pedal function when the vehicle is in reverse or if the speed control is on. The BCM does this by providing voltage to the coil of the normally closed Adjustable Pedals Relay, which opens the contacts in the relay.