Section 61 (Audio/Video/Entertainment/Connectivity (Service Information)): Operation

WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

The audio system components are designed to provide audio entertainment and information through the reception, tuning and amplification of locally broadcast or satellite, (if equipped) radio signals in both the Amplitude Modulating (AM) and Frequency Modulating (FM) commercial frequency ranges.

The audio system components operate on battery current received through a fuse in the Power Distribution Center (PDC) on a fused ignition switch output (run-acc) circuit so that the system will only operate when the ignition switch is in the RUN or ACCESSORY positions.

The optional navigation radio system receives GPS signals from up to eight satellites to display the position and direction of the vehicle. An electronic gyro-sensor and the vehicle's speed sensor enable the system to display the present vehicle position even in locations where GPS signals may be blocked.

When a destination is selected, the navigation system uses information from the map to quickly calculate a route. As the vehicle is driven along the chosen route, the operator is guided with pictorial displays and voice prompts.

On vehicles that are equipped with the optional remote radio switches, the Body Control Module (BCM) receives the input from the Steering Column Control Module (SCCM). The inputs are sent over the Local Interface Network (LIN) data bus from the remote radio switches to the SCCM. The programming in the BCM allows it to process those inputs and send the proper messages to the radio receiver over the CAN-IHS network to control the radio volume up or down, station seek up or down, preset station advance, and mode advance functions.

On vehicles equipped with RA3 and RA4 radios, and have an amplifier, the radios use a different strategy for the four channel output. The left front channel is used for Voice Recognition (VR) and navigation turn-by-turn direction audio, the right front channel is used for cell phone audio. The rear channels are used for stereo, right and left channel, output to the amplifier. The signal data from the antenna, USB or AUX inputs on the rear channels is split logically so that it appears to the occupant to be surround sound. With this channel strategy, there is the possibility of additional symptoms of "no audio" from either the navigation system or the cell phone that will not set a DTC.