Audio And Visual System Description
Basic Configuration
The Audio and Visual system consists of a digital audio/video playback function, communication with the client's compatible device, and display of the driver's support information.
Infotainment Control Unit
The infotainment control unit acts as a processor which includes playback functions for the USB, Bluetooth ® audio, iPod for music, and an external radio tuner and amplifier that is controlled through digital communication. Select audio functions using the audio switches (volume and seek switch), True Touchpad Interface, or the audio remote-HFL switch (on the steering wheel).
There are two kinds of infotainment control units according to a vehicle model:
| With Navigation | Without Navigation | |
|---|---|---|
| With 17 Speakers | o | x |
| With 13 Speakers | o | o |
| With 10 Speakers | x | o |
The infotainment control unit controls external audio/visual system-related devices which do not have an audio disc player and a control module. An antenna for Bluetooth communication, and an antenna for wireless LAN communication are built into the infotainment control unit. Audio, Navigation, and HFL functions are installed in the infotainment control unit as an application software. As an advanced feature, a smartphone linking function and a video playback function are available.
The infotainment control unit communicats with other units using only the LVDS (Low Voltage Differential Signaling), RS485, USB, and the MOST (Media Oriented Systems Transport) bus. For more information on the MOST, refer to the MOST Bus Configuration.
The infotainment control unit has a built-in gyro sensor and a GPS receiver circuit. GPS information is also used for a function that needs vehicle location other than the navigation function. In a vehicle equipped with navigation, the navigation map data is installed in the infotainment control unit (refer to the Navigation Function description).
There are three audio systems available for the infotainment control unit:
- The system with 17 speakers: An external stereo amplifier 16 channel output, 15 speakers and two subwoofers are equipped. The system outputs a digital audio signal to the stereo amplifier.
- The system with 13 speakers: An external stereo amplifier 12 channel output, 11 speakers and two subwoofers are equipped. The system outputs a digital audio signal to the stereo amplifier.
- The system with 10 speakers: An external stereo amplifier 7 channel output, 8 speakers and two subwoofers are equipped. The system outputs a digital audio signal to the stereo amplifier.
Fail-Safe Function
The infotainment control unit performs a fail-safe control when the system detects an abnormal state in the unit:
- Built-in cooling fan on/off control: When the infotainment control unit temperature is too high, the infotainment control unit turns the cooling fan on until the temperature cools down.
- Low voltage detection: When the infotainment control unit detects low voltage (under 6 V) at the +B_AUDIO line, the infotainment control unit is turned off forcibly.
- Lost communication detection: When MOST bus communication is lost, the infotainment control unit outputs an error message, then turned off forcibly after 30 seconds.
Self-Diagnostic Function
The infotainment control unit has a self-diagnostic function to check the failure of the infotainment control unit or its connection.
OTA (Over the Air) Update
The infotainment control unit is able to download the update software for the infotainment control unit and the telematics control unit using a Wi-Fi network or a USB storage device. The telematics control unit is able to download the update software using its own cellular network (refer to the AcuraLink description).
The infotainment control unit checks the software compatibility in each unit every time the vehicle is turned to ACCESSORY or the ON mode. If the original unit is substituted with a known-good unit, the infotainment control unit notifies the Acura server that the original unit was replaced after the communication is established. If necessary, the infotainment control unit downloads the update software from the Acura server.
If the OTA update fails, or was disabled, the center display unit indicates an error message, and the infotainment control unit stores an error code about the message. The error code can be checked on the System Diagnostic Mode.
Center Display Unit
The center display unit has a 10.25 inch color TFT LCD. The surface of the display is given an anti-glare coating and an anti-fingerprint coating in which fingerprint is not attached easily. This unit displays the navigation map, vehicle information, various menu screens, and a rearview or multi-view * image, and can operate the audio, navigation, and HFL functions by using the True Touchpad Interface. The display panel has an illumination dimming function that is controlled by the B-CAN information. The rearview camera or the multi-view camera unit * is connected directly to the center display unit.
*: Refer to the Multi View Camera System description.
Controls
The center display unit turns on when the DISP_CONT signal changes from OFF to ON (depends on the infotainment control unit).
The center display unit shows the rearview image immediately when the transmission is shifted to R position/mode.
After turning the center display unit on, all the communication for mutual status use the dedicated digital signal (LVDS) line.
Audio and visual system information that is shown to the multi-information display (MID) or the head up display is sent to the gauge control module using the MOST bus.
Fail-Safe Function
The center display unit performs a fail-safe control when the system detects an abnormal high temperature in the unit:
- When the center display unit temperature rises over about 131 deg.F (55 deg.C), the display brightness dims gradually.
- When the center display unit temperature rises to 158 deg.F (70 deg.C), the display brightness dims to 40 % of normal brightness.
- When the center display unit temperature rises over 194 deg.F (90 deg.C), the center display unit sends the error status to the infotainment control unit, and then the display back light turns off (the background system stays on).
- When the center display unit temperature drops to below 185 deg.F (85 deg.C), the display back light turns on and the display brightness returns gradually as the temperature drops.
Self-Diagnostic Function
The infotainment control unit can check the center display unit status by performing the System Diagnostic Mode.
Parking Sensor Indication Function
Parking sensor indication is based on the B-CAN information (refer to the Parking and Back-Up Sensor System description about the parking sensor function).
If the center display unit receives information about a failure of the sensor(s) from the gauge control module via the B-CAN bus, the center display unit shows the indicator(s) of failure status (solid red) on the display.
- The failure status is displayed in the parking sensor warning screen when the center display unit receives normal detection information and failure information at the same time.
- When displaying a rearview camera image, the display can indicate only a failure status if the center display unit receives failure information.
Cross Traffic Monitor Indication Function
Cross traffic monitor indication is based on the B-CAN information (refer to the Cross Traffic Monitor System description about the cross traffic monitor function).
If the center display unit receives information about a failure of the blind spot information (BSI) system from the gauge control module via the B-CAN bus, the center display unit shows the indicator (icon) of failure status on the display.
Touchpad Unit
The touchpad unit has a True Touchpad Interface and hard switches. This unit can operate each function on the center display unit, and detects external audio switch signals.
An electrostatic capacitive touch panel is used for the True Touchpad Interface. There are two sensitivity modes available (Low/High).
Electrostatic Capacitive Touch Panel
To use the True Touchpad Interface, bring your finger close to the touchpad or gently touch it with your finger. The touch sensor senses the change of the electrical charge when your finger is close to the touchpad and detects the position of the electrical charge. Gently touch to select or move the screen image, pressing hard is not necessary. The screen cannot sense your touch if you wear heavy gloves, use a fingernail, or a pen.
Controls
The touchpad unit turns on when the TOUCHPAD_CONT signal changes from OFF to ON (depends on the infotainment control unit).
After turning the touchpad unit on, all communications use the dedicated digital signal (RS485) line.
Self-Diagnostic Function
The infotainment control unit can check the touchpad unit status by performing the System Diagnostic Mode. Additionally, the touchpad unit has original error codes that can be displayed on the diagnostic screen to identify the failure part.
MOST Bus Configuration
Some audio and visual system components pass the signals to the infotainment control unit via the MOST bus. The MOST network uses an Ethernet protocol which is formed independently from other vehicle systems. This bus is used for communicating audio, video, and control signals to each unit in the MOST network. The MOST bus consists of the INIC (Intelligent Network Interface Controller) that is mounted in each unit, dedicated coaxial cable (MOST TX+/MOST RX+, MOST TX-/MOST RX-), and electronic control line (MOST_ECL). The MOST bus forms a ring topology between each MOST-related unit. The gauge control module is used as a GATEWAY to communicate F-CAN/B-CAN data or the audio remote-HFL switch operation signal to the MOST network. Any open connections or short in the wiring in MOST circuit will cause audio and visual system functions to appear inoperative.
Starting Process
All MOST_ECL lines always references the 12 volt battery voltage. When turning the MOST network to ON, the gauge control module outputs the ECL wake-up pulses to all MOST connected unit via the MOST_ECL line. Then the MOST network starts up from the gauge control module (MOST TX+ line). When the MOST network starts up from the audio and visual system, one of the unit in the MOST bus network outputs the ECL wake-up pulses to the gauge control module first.
MOST Network Status
| Status | Description |
|---|---|
| OFF | Each unit in the MOST network are in the state of lowest power consumption. |
| Stand by | Even if the vehicle is in the OFF (LOCK) mode, each unit in the MOST network maintains communication (center display is turned OFF). |
| ON | Each unit in the MOST network are in the full operation state (center display is turned ON). |
| Ring brake mode | If each unit in the MOST network (MOST TX+/MOST RX+ lines) have loss of communication, each unit is prepared to transmit any command using the MOST_ECL line. If no command is transmitted, the MOST network is shifted to the OFF state after 30 seconds. |
System OFF Process
The MOST network status refers to the following information.
- ENTRY_STATUS: The driver's door status (OPEN, CLOSED, or LOCKED) is received from the gauge control module.
- IGNITION STATUS: The vehicle power status (BATTERY, ACCESSORY, ON, or REMOTE) is received from the gauge control module.
- SYSTEM_PURPOSE STATUS: The infotainment control unit defines the purpose of the MOST communication (for a client or AcuraLink).
When the vehicle is turned to the OFF (LOCK) mode, the IGNITION STATUS is changed to the BATTERY mode. In this mode, the infotainment control unit defines the MOST network OFF status by SYSTEM_PURPOSE STATUS and ENTRY_STATUS.
Hard Error Codes
MOST-related units (including the gauge control module) store original hard error codes that can be displayed on the System Diagnostic Mode screen to identify the failure part.
ECL Test Mode
If the MOST bus is broken, the center display unit does not work and it is not possible to diagnose on the System Diagnostic Mode. To check the MOST bus connection, use the ECL test mode that is displayed on the multi-information display (MID) in the gauge control module.
Audio and Visual System Functions
Anti-Theft Function
The infotainment control unit has an anti-theft protection function separate from the security system of the vehicle. If the infotainment control unit is removed from the vehicle, the infotainment control unit requires a procedure to unlock the security system in order to use it again after the infotainment control unit is reconnected.
There are two kinds of anti-theft mode release procedures:
- While displaying the security code entry screen or the confirmation screen of the anti-theft system, press and hold the AUDIO POWER (
) button for at least 2 seconds. The infotainment control unit automatically exits the anti-theft mode.
- While displaying the security code entry screen, enter the 5-digit anti-theft code.
The System Diagnostic Mode (includes checking hard error codes) can be used even if the infotainment control unit is in the anti-theft mode.
If you substitute the infotainment control unit into another vehicle, you must either enter the anti-theft code or perform the anti-theft skip mode in the System Diagnostic Mode (this function will release the anti-theft mode until the vehicle is turned to the OFF (LOCK) mode).
Muting Logic
The outline of the audio muting function is shown in the following tables:
With 17 Speakers/With 13 Speakers
| Contents | Audio Output | |||||||
|---|---|---|---|---|---|---|---|---|
| FrontCenter CH | Driver's Door CH L. Tweeter CH | Front Passenger's Door CH R. TweeterCH | L. Front RoofCH | R. Front RoofCH | Rear DoorCH* | Rear Roof CH* Satellite CH | SubwooferCH | |
| System beep | Audio | Beep and audio | Beep and audio | Audio | Audio | Audio | Audio | Audio |
| Pressing TALK/BACK buttons | Feedback output | Muted | Muted | Muted | Muted | Muted | Muted | Muted |
| Guidance | Guidance output and attenuated audio | Attenuated audio | Attenuated audio | Attenuated audio | Attenuated audio | Attenuated audio | Attenuated audio | Attenuated audio |
| HFL | Muted | HFL output | HFL output | HFL output | HFL output | Muted | Muted | Muted |
| HFL and Guidance | Guidance output | HFL output | HFL output | HFL output | HFL output | Muted | Muted | Muted |
| Driver only | Muted | Audio | Muted | Audio | Muted | Muted | Muted | Muted |
| Front only | Audio | Audio | Audio | Audio | Audio | Muted | Muted | Muted |
| Rear only | Muted | Muted | Muted | Muted | Muted | Audio | Audio | Audio |
*: With 17 speakers
With 10 Speakers
| Contents | Audio Output | |||
|---|---|---|---|---|
| Driver's Door CH L. Tweeter CH | Front Passenger's Door CH R. Tweeter CH | Satellite CH | Subwoofer CH | |
| System beep | Beep and audio | Beep and audio | Audio | Audio |
| Pressing TALK/BACK buttons | Feedback output | Feedback output | Muted | Muted |
| Contents | Audio Output | |||
|---|---|---|---|---|
| Driver's Door CH L. Tweeter CH | Front Passenger's Door CH R. Tweeter CH | Satellite CH | Subwoofer CH | |
| Guidance | Guidance output and attenuated audio | Guidance output and attenuated audio | Attenuated audio | Attenuated audio |
| HFL | HFL output | HFL output | Muted | Muted |
| HFL and Guidance | HFL output | HFL output | Muted | Muted |
| Driver only | Audio | Muted | Muted | Muted |
| Front only | Audio | Audio | Muted | Muted |
| Rear only | Muted | Muted | Audio | Audio |
Voice Control Function
This audio and visual system also has voice recognition that allows voice control of most audio, navigation, and HFL functions. The infotainment control unit supports natural language understanding using an external network. The TALK button on the steering wheel activates the voice control. The voice control also allows control of the climate functions.
When the voice recognition is in use, the infotainment control unit sends the fan mute signal to the gauge control module via the MOST bus. Then sends the signal to the climate control unit via the B-CAN bus. The blower fan operating voltage may be reduced depending on the current fan speed.
Song By Voice (TM)
A client can use the Song By Voice (TM) feature to select and play the audio files in an iPod or a USB device with voice commands.
When an iPod or a USB device is connected to the infotainment control unit, the unit makes a dictionary from the album name, folder name, artist name, track name, and the file name.
If a different device is connected, or the client updates the files on the connected device, a new dictionary is created.
Speed-Sensitive Volume Compensation (SVC)
All audio functions are equipped with speed-sensitive volume compensation (SVC). The stereo amplifier receives the vehicle speed signal from the gauge control module via the MOST bus. The function processes the speed input and increases the audio volume level as the vehicle speed increases to compensate for the interior noise that occurs at higher speeds. When the vehicle slows down, the volume returns to its normal level. The SVC has four settings: SVC OFF, SVC LOW, SVC MID, and SVC HIGH that can be adjusted using the center display.
Operation Restriction
The infotainment control unit has a function that restricts certain operations of audio and visual system that may affect safe driving.
Clock Function
The infotainment control unit has a real time clock circuit that operates the clock even if the vehicle is in the OFF (LOCK) mode. Also, the infotainment control unit can display clock information by receiving the GPS signal.
HD RADIO (TM)
HD RADIO (TM) is a crystal clear digital audio broadcast by local radio stations. There is no charge for HD RADIO (TM). Simply tune to your favorite station, and if the station is broadcasting with HD RADIO (TM) technology, then the tuner unit will automatically pick up the digital signal, and begin playing the crystal clear, subscription free audio. Refer to your Owner's Information to determine how your particular receiver indicates HD RADIO (TM) reception and how to transition from the main program to the multicast program(s).
- The HD1 channel acquires the analog station first and then blends with the digital signal. Therefore, the digital audio may have a short delay.
- There is no analog signal available on the HD2/HD3 channels. Therefore, there is a short delay while decoding the digital audio. Audio will begin playing when available.
- Go to www.hdradio.com for stations in the area to verify correct operation on the station.
Internet Radio (USA models)
The audio system includes the Pandora ® application installed in the infotainment control unit as a separate audio source. The infotainment control unit uses the client's smartphone data connection to access the Pandora ® server, and transmits the internet radio data to the infotainment control unit via USB or Bluetooth.
USB Connection
The infotainment control unit has a USB port for an external device input of a smartphone connection. USB port A is based on the specification of USB Battery Charging 1.2 (BC 1.2) that supports high-speed charging of the USB device. The infotainment control unit can detect the USB device type (BC 1.2 or not), and change the charging mode automatically.
USB Audio
The audio system can play digital music from portable audio players, a USB drive, etc. When the device is plugged into vehicle's USB port A, and the vehicle is turned to the ACCESSORY mode, the infotainment control unit begins to communicate with the connected USB device and supplies the VBUS power. The infotainment control unit controls the device when searching and playing the files. Not all players and player functions work with the USB adapter. Please see the Owner's Information for more information.
Supported Devices
- Supports for USB Mass storage class and Bulk-only transport are supported.
- USB 2.0 Full-speed/High-speed capable.
- At least 256 MB storage capacity.
- USB formatted to be compatible with Windows-based operating systems.
- If the USB has a security feature, like write protection, it must be turned off.
There are many different USB devices, manufacturers, and configurations with new devices being released every day, which makes it impossible to test all USB devices with the audio system. Even if the USB device has all these requirements, it may not be compatible.
Hard drives do not support overwriting the data for the track order, which is why they are not recommended.
When you disconnect a USB device, the data for the track order remains in the infotainment control unit's memory so when you reconnect the same USB device, the infotainment control unit continues playing from the location where it was disconnected. If a new USB device is connected, the data for the track order is rewritten and you need to select the album or music file.
Bluetooth ® Connection
The infotainment control unit can be paired with a compatible cell phone or a device for Bluetooth communication. Pairing procedures vary by the connection history and Bluetooth version of the cell phone or the device. Refer to the Owner's Information.
The infotainment control unit supports Bluetooth Ver 4.0+EDR/LE. Bluetooth enables audio streaming, wireless play back on an audio device, hands-free calling with a cell phone, data communication, and phone book loading.
Bluetooth ® Audio
Bluetooth audio allows compatible Bluetooth cell phones equipped with music function to play music via the vehicle's audio system using Bluetooth technology. You can control the cell phone's music player remotely using the wireless connection.
- You can play music stored in your cell phone using the wireless connection.
- You can choose the next song, a previous song and resume/pause via the wireless connection.
Supported Devices
- Bluetooth music phones that support A2DP 1.2, AVRCP 1.6 and previous versions.
- Bluetooth adapters for portable music devices including iPod are not supported.
Wireless LAN Connection
The infotainment control unit supports wireless LAN connection based on the IEEE 802.11 a/b/g/n/ac standard. The infotainment control unit can connect the device that has a function as Wi-Fi access point.
Video Playback Function
The audio and visual system can play digital compressed videos from a USB device (MP4 is supported).
Smartphone Linkage Function
This function helps ensure the safe use of a smartphone while driving. Connect a smartphone to the infotainment control unit to use it. Connection methods vary depending on carriers.
When using the navigation function via a smartphone, the infotainment control unit can display the navigation map screen that is in the connected smartphone. In this case, the GPS signal is received by the infotainment control unit, and the vehicle signals are received from the gauge control module via the MOST bus as information of vehicle position tuning.
When using the voice recognition function via a smartphone, the HFL microphone in the roof module picks up the driver's voice, and sends the voice signal to the smartphone via the infotainment control unit using Bluetooth.
Navigation Function (With Navigation)
The navigation function is a highly-sophisticated, hybrid locating system that uses satellites and a map database to show you where you are and to help guide you to a desired destination.
The infotainment control unit receives signal from the global positioning system (GPS), a network of 24 or more satellites in orbit around the earth. By receiving signals from several of these satellites, the infotainment control unit can determine the latitude, longitude, and elevation of the vehicle. In addition, signals from the infotainment control unit's own gyro sensor and vehicle information (vehicle speed pulse) enable the system to keep track of the vehicle's direction and speed of travel.
The navigation function is installed in the infotainment control unit as an application. The basic navigation function is composed of the infotainment control unit, center display unit, vehicle information signals (vehicle speed pulse, reverse signal), and the GPS antenna.
Calculation of Vehicle Position
The infotainment unit calculates the vehicle position (the driving direction and the current position) by receiving the directional change signals from the gyro sensor, and the travel distance signals from vehicle information (vehicle speed pulse, reverse signal).
Map Matching Tuning
Map match tuning means that the vehicle's position is properly indicated on mapped roads. The map data is checked against the current vehicle position data and the vehicle's position is indicated on the nearest road. Map matching tuning cannot be done when the vehicle is on an unmapped road, or if the vehicle is far away from a mapped road.
GPS Tuning
GPS tuning improves the accuracy of the vehicle's actual position in relation to the GPS vehicle position. The infotainment control unit compares its calculated vehicle position with the GPS position. If there is a large difference between the two positions, the GPS tuning adjusts the calculated vehicle position to the GPS position.
Distance Tuning
The infotainment control unit compares the vehicles calculated distance using the vehicle speed pulse and the vehicle's actual position based on GPS data. If the values are different, the infotainment control unit decreases or increases the tuning value depending if the vehicle's calculated position is always ahead or behind the GPS position.
Gyro Sensor
The 3-axis gyro sensor (located in the infotainment control unit) detects the direction change (angular speed) and the attitude of the vehicle.
GPS Antenna
The GPS antenna that is installed on the roof amplifies and transmits the signals received from the satellites to the GPS receiver.
GPS Receiver and Clock
The GPS receiver is built into the infotainment control unit. It calculates the vehicle position by receiving the signal from the GPS antenna. The current time, vehicle position, and signal reception condition are transmitted from the GPS receiver to the navigation provider to adjust vehicle position and the clock display in the infotainment control unit. Also, the infotainment control unit can set world time zone automatically by calculating the vehicle position.
Audio Guidance
The infotainment control unit outputs navigation voice guidance before entering an intersection or passing a junction.
The voice guidances are sent to the stereo amplifier using the MOST bus. When the speaker outputs the voice guidance, audio muting logic is orchestrated by the infotainment control unit. The infotainment control unit determines what audio source has priority to use the speakers. Refer to the Muting Logic with the infotainment control unit.
Turn by Turn Directions
The infotainment control unit outputs the route guidance (direction) information to the gauge control module via the MOST bus. In the case of route guidance mode, the multi-information display (MID) or the head up display shows the simple routing guidance using an arrow. When operating in other than route guidance mode, the MID or the head up display shows the azimuth (direction) information in 16-directions.
Traffic Message Channel
Traffic message channel is a broadcast for delivering traffic information to the driver. The traffic data is coded using the FM broadcast.
The tuner unit supports the HD-TPEG, HD Traffic (TM), and the RBDS-TMC channels. The tuner unit automatically switch these channels by the data received.
The tuner unitdecodes the traffic information data. The traffic information is displayed with the navigation route guidance. It is used to avoid traffic jams and accidents (see the Navigation Manual for more information).
HandsFreeLink (HFL) Function
The HFL function automatically connects to a linked phone when the vehicle is in the ACCESSORY or the ON mode. Depending on the type of cell phone, the HFL also synchronizes with the paired cell phone's phone book to automatically update any changes.
The infotainment control unit has a built-in HFL circuit and a Bluetooth module. The front HFL-ANC/active sound control microphone in the roof module is connected to the stereo amplifier. The audio remote-HFL switch controls the HFL function.
Pairing a Cell Phone
The infotainment control unit can be paired with an Acura approved cell phone by Bluetooth communication. Pairing procedures vary by the connection history and Bluetooth version of the cell phone. Refer to the Owner's Information.
When the Bluetooth cell phone that supports PBAP and AT Command is connected, the phone book data in the cell phone is transferred to the infotainment control unit automatically. A function to delete an item in the phone book is not supported.
General Operation
The audio remote-HFL switch on the steering wheel is used to answer incoming calls, to make outgoing calls, or to end a call. The HFL information is sent to the gauge control module using the MOST bus to display on the multi-information display (MID) or the head up display.
The HFL microphone picks up the driver's voice, and sends the signal to the infotainment control unit. The signal is then sent from the Bluetooth module to the cell phone.
The caller's voice signal is sent from the cell phone to the Bluetooth module. The infotainment control unit sends the voice signal to the stereo amplifier, then outputs the caller's voice through the front door speakers. When you are talking on the cell phone using the HFL, rear speakers are muted. Refer to the Muting Logic with the infotainment control unit.
Text/E-mail
The infotainment control unit processes the short message service (SMS) data sent from the cell phone. When a Bluetooth enabled cell phone that supports Message Access Profile (MAP) is connected, the infotainment control unit processes the multimedia message service (MMS) and the E-mail data sent from the cell phone.
The text message information is displayed on the center display unit. Also, the head up display displays the Text/E-mail status by pop-up screen.
The infotainment control unit can read out the text message using the Text-to-Speech (TTS) engine. The voice outputs to the driver's and front passenger's speakers.
Active Noise Cancellation (ANC)/Active Sound Control
Both the active noise cancellation (ANC) and active sound control are built into the ANC/active sound control unit. Both systems help eliminate unwanted sound from entering the vehicle's cabin. There are three microphones mounted in the headliner (front, middle, and rear) as related parts.
Active Noise Cancellation
The ANC works to cancel engine booming sound up to engine speed about 3, 450 (3, 200 *1) rpm. The ANC/active sound control unit receives the engine speed pulse (NEP) from the PCM and outputs an antiphase sound with low-frequencies in the cabin through the audio speakers (front door speaker (17 cm), front center speaker, and subwoofer) to cancel low-frequency noise from the engine. The ANC also use three microphones to detect and monitor low-frequency noise in the vehicle's cabin. The microphones feed information back to the stereo amplifier which adjusts the speaker output to reduce the noise. The ANC also receives input from the door and the window open/close signals from the gauge control module. Anytime a door is opened, the ANC temporarily stops working. Each signal is sent to the ANC/active sound control unit via the F-CAN bus.
*1: 3.0 L engine
The ANC/Active sound control unit monitors the stereo amplifier output signals to the front speakers, and if the front speakers outputs a sound more than the rated value, the ANC/Active sound control unit stops ANC control. This control is to prevent deleting bass of an audio output.
Active Sound Control
The active sound control is the next generation of eliminating unwanted sound in the vehicle's cabin. The ANC/active sound control unit receives the engine speed pulse (NEP) from the F-CAN bus for adding sine wave signal to the engine sound to provide various levels of sound control depending on changes in the engine rpm. The ANC/active sound control unit controls the cabin sound at engine speed of 1, 200 (600 *1) rpm or more.
*1: 3.0 L engine
Active Vibration Control (3.0 L Engine)
Active vibration control reduces engine vibration by providing the subframe with antiphase vibration. It helps keep the cabin comfortable by performing the same control as active noise cancellation. There is no communication between the ANC/active sound control unit and the active vibration control unit. Refer to the Active Vibration Control System description - Refer to: Active Vibration Control System Description or Active Vibration Control System Description(3.0L Engine) .
Tuner Unit
The tuner unit is a separate digital radio tuner interface. Received AM/FM/XM radio waves are processed on the digital signal processor (DSP) and is sent to the stereo amplifier via the MOST bus. At this time, HD RADIO (TM) sound signal is separated from normal AM radio sound signals. All of the information about AM/FM/XM reception (includes RBDS information) are sent to the infotainment control unit.
Self-Diagnostic Function
The infotainment control unit can check the tuner unit status by performing the System Diagnostic Mode.
System Status Indicator
The tuner unit has an indicator light (amber) to check if the tuner unit is communicating with the MOST bus. If no command is received from the MOST bus, the tuner unit turns the system status indicator OFF after 30 seconds.
Roof Antenna (AM/FM/XM/GPS)
The AM/FM antenna, XM antenna, and the GPS antenna are integrated into the roof antenna. The sensitivity of FM signal is raised by the auto gain control.
For vehicles with Sirius XM ® radio, the antenna for receiving satellite/terrestrial (XM) signal uses a high-gain antenna. Signals are sent to the tuner unit via the dedicated single line (XM ANT).
Stereo Amplifier
The stereo amplifier is a separated power amplifier interface. Digital audio signal that is received from each unit in the MOST bus network is processed on the DSP, and sent to each speaker after amplified by the AMP IC. If there is a short in the wiring in any speaker circuit, all speakers connected to the same AMP IC will be muted.
The stereo amplifier communicates with the infotainment control unit using the MOST bus. This communication includes the vehicle speed (for SVC) information, audio settings, audio guidance, system beep, and the MUTE commands. The stereo amplifier adjusts the speaker output which is based on the received information.
The stereo amplifier receives the noise cancelling signal, the auxiliary audio signal, and the microphone signal via independent lines. These analog signals are processed directly in the stereo amplifier.
With 17 Speakers
With 13 Speakers
With 10 Speakers
Self-Diagnostic Function
The infotainment control unit can check the stereo amplifier status by performing the System Diagnostic Mode.
Audio Remote-HFL Switch
The audio remote switch and the HFL switch are integrated into the audio remote-HFL switch that uses the digital communication (LIN(METER)).
The audio remote-HFL switch is connected directly to the gauge control module. When using any buttons on the audio remote-HFL switch, the signal is sent to each unit in the MOST bus network. The gauge control module reflects the control information of the audio remote-HFL switch as indication to the multi-information display (MID) or the head up display.
If the LIN(METER) circuit is open or shorted between the gauge control module and the audio remote-HFL switch, the gauge control module detects the related DTC.
Self-Diagnostic Function
The infotainment control unit can check the status of the audio remote-HFL switch detection by performing the System Diagnostic Mode.
Front HFL-ANC/Active Sound Control Microphone
The front HFL-ANC/active sound control microphone receives voice command, HFL speech, or noise in a cabin, and transmits them to the stereo amplifier and the ANC/active sound control unit.
Array Microphone
The microphone unit consists of two microphones. These microphones detect the driver's voice and the passenger's voice separately.
The microphone is switching the directivity by the voltage change on the HFT_MUTE line.
| Description | HFT_MUTE Signal | |
|---|---|---|
| HFL/NAVI voice recognition mode | When using the HFL voice tag function, HFL voice control function, or the navigation voice recognition function that is embedded into the infotainment control unit, this mode achieves the voice recognition enhancement even if it uses the bidirectional microphones. | 0 - 1.5 V |
| HFL telephone mode | When using the HFL via the infotainment control unit, this mode achieves low-latency using digital processing to voice signal from bidirectional microphones. | 3 - 5 V |
| Server voice recognition mode | When using the voice recognition system via an external device (like smartphone), this mode suppresses background noise to achieve the voice recognition enhancement. | 7 - 9.5 V |
Self-Diagnostic Function
The infotainment control unit can check the voice input level of the HFL microphone by performing the System Diagnostic Mode.
USB Charger Unit
The USB charger unit controls an output current for charging a USB device. Charge-only USB port B located on the center console is a dedicated USB charging port. The USB charger unit is based on the specification of the USB Battery Charging 1.2 (BC 1.2) that supports high-speed charging of the USB device. The USB charger unit can detect the USB device type (BC 1.2 or not), and change the charging mode automatically.
The USB charger unit is launched by turning the vehicle to the ACCESSORY mode. When you connect the USB device to the charge-only USB port, the USB charger unit supplies the appropriate current (maximum 2.5 A) to the USB device via the USB VBUS terminal. In this case, the USB charger unit detects the electrical characteristics from the USB DATA terminals. No data communication occurs between the USB charger unit and the USB device. Also, there is no connection between the USB charger unit and the infotainment control unit.
Fail-Safe Function
The USB charger unit performs a fail-safe control when the system detects an abnormal status in the unit:
- When the USB charger unit detects temperature over about 230 deg.F (110 deg.C), the unit limits the current in USB ports until the vehicle is turned to OFF (LOCK) mode.
- When the USB charger unit detects overcurrent 10 times, the USB charge is stopped for 60 seconds.
- When the USB charger unit detects voltage 6.5 V or more at the USB VBUS terminal, the USB charger unit shuts the VBUS voltage supply down. When the voltage drops to less than 6.5 V, the USB charger unit resumes the voltage supply.
Multi-View Rearview Camera (Without Multi View Camera System)
The multi-view rearview camera is a function that provides three different views to the driver by the camera that is installed at the rear of the vehicle. The view images can be changed by the user. The rearview guidelines change according to the selected view. The rearview camera is connected directly to the center display unit.
- Normal View Mode
The display shows the standard view.
- Wide View Mode
The display shows wider visibility than the normal view, which helps the driver confirm objects approaching from right and left.
- Top Down View Mode
The display shows the view from the top angle of the vehicle, which helps the driver confirm the distance from an object behind.
Basic Control
The center display unit outputs the power source (CAMERA_VCC) to the rearview camera under some conditions:
- Turn the vehicle to the ACCESSORY mode.
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If the center display unit does not detect the BACK_LT signal for 5 minutes, the center display unit cancels outputting the power source to the rearview camera.
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- Detecting the BACK_LT signal (when the transmission is shifted to R position/mode).
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If the center display unit does not detect the BACK_LT signal for 5 minutes after cancelling the rearview mode, the center display unit cancels outputting the power source to the rearview camera.
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When the center display unit detects the BACK_LT signal for at least 0.3 seconds, the center display unit display turns on the rearview camera image. The display delays for 0.3 seconds to prevent changing the screen image too frequently because of incorrect shift position/mode selection. You can change the view mode by selecting the mode icon.
Changing Camera Views
When the rearview camera image is displayed, selecting the mode icon sends a signal from the center display unit to the rearview camera using the CAMERA_BIT0 and CAMERA_BIT1 signal lines to change the rearview camera view.
| Wide | Normal | Top Down | |
|---|---|---|---|
| CAMERA_BIT0 Signal | OFF (0 V) | ON (4 V - 9 V) | OFF (0 V) |
| CAMERA_BIT1 Signal | OFF (0 V) | OFF (0 V) | ON (4 V - 9 V) |
View Mode Memorization
The center display unit maintains the last view mode for 10 seconds after you shift the transmission to other than R position/mode. After that, the center display unit maintains last view mode (only wide view and normal view) even if the vehicle is turned to the OFF (LOCK) mode. The rearview camera image will change to wide view if you had the top down view selected when you turn the vehicle to the OFF (LOCK) mode.
Dynamic Guideline
When the rearview image is displayed with the guideline, the guideline changes according to the steering angle input (when the steering rotates 90 degrees or more). The steering angle information is received from the gauge control module via the B-CAN bus.
Self-Diagnostic Function
The infotainment control unit can check the rearview camera connection by performing the System Diagnostic Mode.