Section 473 (Horn System (Service Information)): Operation: Operation
WARNING: This page is about a different car, the 2013 Dodge Avenger and 2013 Chrysler 200. However, it is still accessible from the selected car via links, so may be relevant.
The horn system operates on battery current received through the Totally Integrated Power Module (TIPM). The horn system circuit is designed so that the system will remain operational, regardless of the ignition switch position. The system is a dual horn design that operates on signals received by the TIPM over the Controller Area Network (CAN) data bus from the Cab Compartment Node (CCN), when the horn switch is pressed.