Section 725 (Horn System (Service Information)): Operation

WARNING: This page is about a different car, the 2020 Chrysler 300 and 2019 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.

The horn system components operate on battery current received through non-switched fused B(+) circuits so that the system will remain operational, regardless of the status of the ignition. The Body Control Module (BCM) controls the output of battery current to the horns through a horn relay located within the front Power Distribution Center (PDC). The BCM controls the relay based upon internal programming as well as electronic message inputs received from the Steering Column Control Module (SCCM) or the Radio Frequency Hub (RF-Hub) over the Controller Area Network (CAN) data bus.

The vehicle operator can control typical horn system signaling through the horn switch contacts within the hub cavity of the steering wheel. When the Driver AirBag (DAB) trim cover in the center of the steering wheel is pressed, it provides a hardwired analog input to the SCCM. The SCCM then sends an electronic horn switch status message to the BCM over the CAN data bus.

In addition, the RF-Hub sends electronic horn request messages to the BCM over the CAN data bus in response to inputs received from the FOB with Integrated Key (FOBIK) Remote Keyless Entry (RKE) transmitter in vehicles with the Passive Entry Keyless Go (PEKG) system. Lastly, as the Vehicle Theft Security System (VTSS) controller, the BCM can activate the horn system based upon programming and both hardwired and electronic message inputs from the various VTSS components.

The horns can be activated by the BCM to support each of the following features:

RKE System - RKE system Lock request audible verification.
RKE System - RKE system Panic mode audible alert.
Remote Start System - Remote Start System Start request audible verification.
Vehicle Theft Alarm (VTA) - VTA audible alarm.

The RKE system Lock request audible verification is a customer programmable feature, which allows the feature to be enabled or disabled to suit individual preferences. Refer to CENTER, ELECTRONIC VEHICLE INFORMATION, OPERATION .

The hardwired circuits between components related to the horn system may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds. For proper wire repair, and connector repair procedures. Refer to STANDARD PROCEDURE , REMOVAL , and INSTALLATION .