Description And Operation

DESCRIPTION 

Courtesy of CHRYSLER GROUP, LLC

The audio system includes the following components:

Several combinations of radios and speaker systems are offered on this vehicle. The audio system receives fused battery voltage from a fuse in the BCM at all times. On vehicles that are equipped with Engine Stop/Start (ESS), the radio receives fused battery voltage from the Voltage Stabilizer Unit.

There are four radios available in this vehicle, Uconnect® 3 (without NAV) with 5 inch display, Uconnect® 4 (without NAV) with 7 inch display and Uconnect® 4 (without NAV) with 8.4 inch display and Uconnect® 4C NAV with 8.4 inch display. In certain export markets, there is a Uconnect® 4 NAV with 8.4 inch display radio available. Each radio has a distinct chassis design and is identified by a sales code.

With the optional navigation system, the operator has the option of choosing a street address, point of interest, trip itinerary and other features outlined in the operator's manual.

OPERATION 

The audio system components are designed to provide audio entertainment and information through the reception, tuning and amplification of locally broadcast radio signals in both the Amplitude Modulating (AM) and Frequency Modulating (FM) commercial frequency ranges. If the vehicle is so equipped, the audio system can also receive, amplify or process certain cellular, satellite audio and satellite Global Positioning System (GPS) radio signals. The audio system components operate on battery current received through a fuse in the BCM.

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 speed sensor in the vehicle 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.

The SGW is in the audio and telematics systems to provide security against certain types of attacks and threats from the scan tool, telematics and entertainment buses, which can put the rest of the vehicle's buses at risk of intrusion. The SGW lies electrically between the vehicle on one side, and the Data Link Connector (DLC), telematics and entertainment systems on the other side. The main function is to gate messages from one bus to another. The SGW monitors the B(+) Feed, switched ignition feed, CAN circuits, software and hardware for any concerns.

The hardwired circuits between components related to the audio system may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. The wiring information includes appropriate SYSTEM 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 .

However, conventional diagnostic methods will not prove conclusive in the diagnosis of the audio system or the electronic controls and communication between modules and other devices that provide some features of the audio system. The most reliable, efficient and accurate means to diagnose the audio system or the electronic controls and communication related to audio system operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.

The audio amplifier receives fused battery current from a fuse in the rear Power Distribution Center (PDC) and is grounded through a circuit of the body wire harness that is secured to the body sheet metal at all times. The internal circuitry of the amplifier switches the amplifier ON or OFF based upon electronic messages that are received over the CAN - Interior High Speed (IHS) data bus from the radio whenever the radio is turned ON.

The amplifier receives analog sound signal inputs from the front and rear, left and right outputs of the radio, then provides the amplified speaker outputs for each of those channels to the appropriate speakers through dedicated audio output circuits. The amplifier also receives electronic messages from the BCM and the radio over the CAN-IHS data bus that communicate the correct channel settings for optimum speaker sound and output.

The BCM supplies fused B(+) to the radio.

On vehicles that are equipped with remote radio switches, the BCM receives the input from the switches on the steering wheel. The programming in the BCM allows it to process those inputs and send the appropriate electronic command messages to the radio over the CAN-IHS data bus to control the radio volume up or down, station seek up or down, preset station advance, and mode advance functions.

Inputs:

• Vehicle speed from ABS
• Vehicle speed fault status from ABS
• Forward Facing Camera Module (FFCM) chime type status
• FFCM chime request - RF and LF
• Park Assistance Module (PAM) chime activation request
• PAM chime repetition rate
• PAM chime type
• Side Distance Warning (SDW) chime configuration status
• SDW chime request
• SDW chime type

Outputs:

• Vehicle speed
• Vehicle speed fault status
• FFCM chime type status
• FFCM chime request - RF and LF
• PAM chime activation request
• PAM chime repetition rate
• PAM chime type
• SDW chime configuration status
• SDW chime request
• SDW chime type

If the vehicle is equipped with satellite audio, a combined antenna for AM/FM and satellite and navigation is used. For AM/FM only, the antenna looks similar, but the base is smaller and is mounted in the same location.

The audio system components are designed to provide audio entertainment and information through the reception, tuning and amplification of locally broadcast radio signals in both the Amplitude Modulating (AM) and Frequency Modulating (FM) commercial frequency ranges and other frequencies in export markets - AM/FM North America and MW/LW EMEA radio frequencies received.

The combination antenna consists of a Satellite Digital Audio Radio Service (SDARS) element, Global Positioning System (GPS) element, AM/FM element and a Long Term Evolution 1 (LTE1) element.

Digital audio broadcast antenna is a digital radio standard for broadcasting digital audio radio services, used in many countries around the world, though not in North American countries. The antenna for digital audio broadcast signals is screened on the liftgate glass and connects to the digital audio broadcast antenna module, which amplifies the digital audio broadcast antenna signals for the radio.

A digital audio broadcast antenna module and antenna are used in the countries that use it in place of an AM/FM antenna to receive digital audio broadcast signals.

The digital audio broadcast antenna module is powered by a 9 volt output from the radio through the coaxial cable whenever the radio receiver is active. The module receives digital audio broadcast Radio Frequency (RF) signals supplied by the on-glass digital audio broadcast antenna grid elements screened to the inside of the liftgate glass. The capacitor selectively filters Radio Frequency Interference (RFI) from the received signals, while the module amplifies the received signals. The filtered and amplified signal is then sent through the coaxial cable to the radio digital audio broadcast antenna input.

The hardwired inputs and outputs to the antenna module may be diagnosed using conventional diagnostic tools and procedures. However, the module is diagnosed by substituting a known good external antenna to compare reception performance.

Long Term Evolution (LTE) is the latest standard in mobile networking technology, referred to as 4G LTE promises to dramatically increase mobile downlink data rates. Antennas are produced for LTE applications in single and multi-band configurations for Single Input Multiple Output (SIMO) and Multiple Input Multiple Output (MIMO) systems.

An antenna is an electrical device which converts electric power to radio waves, and vice versa. It is usually used with a radio transmitter or radio receiver. In transmission, a radio transmitter supplies an electric current oscillating at radio frequency (for example, a high frequency Alternating Current/AC) to the antenna's terminals, and the antenna radiates the energy from the current as electromagnetic waves (radio waves). In reception, an antenna intercepts some of the power of an electromagnetic wave in order to produce a tiny voltage at its terminals, that is applied to a receiver to be amplified.

The second antenna for cellular telephone data is the LTE2 antenna. It is used for sending and receiving cellular telephone signals and telematics data. The signals and data are supplied to the radio and telematics modules.

The LTE2 antenna is mounted in the instrument panel, behind the radio. The use of the additional LTE antenna is for the purpose of increasing data upload and download speeds.

The LTE2 antenna has an internal 10 kilo ohm resistor to set a Diagnostic Trouble Code (DTC) in the module to which it is connected if the antenna cable or LTE2 antenna is disconnected from that module.

In vehicles so equipped, the media hub allows the audio content of various media devices to be connected to radio. Once connected, the audio content of the media device may be accessed and played through the audio system components of the vehicle using the radio controls.

The radio becomes operational when it receives a wake up signal over the CAN-IHS data bus indicating the status of the ignition switch is ON or Accessory (ACC). For additional information on the operation of the radio or media system in the vehicle, see the heading for the appropriate audio system option in the User Guide or the Owner Manual. See the Uconnect® web site (https://www.driveuconnect.com/  ) for more information, or refer to the For Owners  link on the vehicle brand web site for copies of those publications.

The radio uses a roof mounted antenna for AM/FM signal reception and, depending upon vehicle optional equipment, a roof mounted combination antenna that can receive GPS and satellite radio signals.

Depending upon the audio system options, the radio can play audio from many different media sources. The media can be played by connecting the source to the audio system via a 3.5 millimeter auxiliary (AUX) port, a Universal Serial Bus (USB) port or through wireless Bluetooth® audio streaming. Refer to the Uconnect® web site (https://www.driveuconnect.com/  ) for compatibility information.

The RVC is powered by a ignition feed received through the backup lamp switch output circuit from the BCM so that is only active when the gear selector lever is shifted into the Reverse (R  ) position. The RVC has a path to ground at all times through a take out and eyelet terminal of the body wire harness secured to the body sheet metal. If the camera delay feature is enabled, the RVC will remain active for 10 seconds, up to about 13 km/h (8 mph) or until the touch screen display is pressed after the gear selector is shifted from Reverse (R  ) to Neutral (N  ) or Drive (D  ).

The output of the camera is a video signal compatible to the National Television System Committee (NTSC) standard composite video M format, or NTSC-M. The video signal is delivered to the radio video display unit through the entire length of the vehicle by camera signal and the camera return circuits that are arranged as a twisted pair, with an additional grounded foil jacket to protect the video signal from corruption due to stray radiated signals within the vehicle environment. The ground shield is terminated only at the video display (radio) end, not at the camera. Portions of these video signal wires are contained within the body wire harness and a jumper harness located between the radio and the body harness connector below the instrument panel at the right cowl side inner panel.

The six switches in the two remote radio switch units are normally open, resistor multiplexed momentary switches that are hardwired to the left Steering Wheel Switch (SWS). The remote radio switch signals are sent via a Local Interface Network (LIN) to the Steering Column Control Module (SCCM) on the steering column, which in turn send the signals via a LIN to the BCM. The BCM reads the remote radio switch inputs, then sends the appropriate electronic messages to the radio over the CAN-IHS data bus to invoke the requested command.

Two wires connected to each speaker, one feed circuit (+) and one return circuit (-), allow the audio output signal electrical current from the amplifier section of the radio to flow through each speaker voice coil. If equipped with a subwoofer, the subwoofer has four wires connected to it, two feed (+) and two return (-) circuits for subwoofer one and subwoofer two audio.