System Description

SYSTEM DIAGRAM 

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Component Description 

Part name	Description
AV control unit	AV control unit is located on the back of integral switch. AV control unit controls the audio system of Infiniti InTouch.
Display unit	Display unit can display an external image signal via AV control unit.
USB connector	Sound signal of USB input is transmitted to AV control unit.
BOSE amp.	Inputs sound signal from AV control unit, and outputs sound signal to each speaker.
Front door speaker	Outputs sound signal from BOSE amp. Outputs high, mid and low range sounds.
Rear door speaker	Outputs sound signal from BOSE amp. Outputs high, mid and low range sounds.
Front instrument speaker *1	Outputs sound signal from BOSE amp. Outputs high and mid range sounds.
Squawker *2	Outputs sound signal from BOSE amp. Outputs high and mid range sounds.
Front door squawker *1	Outputs sound signal from BOSE amp. Outputs high and mid range sounds.
Front door tweeter *1	Outputs sound signal from BOSE amp. Outputs high range sounds.
Rear door tweeter	Outputs sound signal from BOSE amp. Outputs high range sounds.
Roof speaker	Outputs sound signal from BOSE amp. Outputs high and mid range sounds.
Center speaker	Outputs sound signal from BOSE amp. Outputs high and mid range sounds.
Woofer	Outputs sound signal from BOSE amp. Outputs high and mid range sounds.
Woofer amp. *1	Inputs sound signal from BOSE amp., and outputs sound signal to woofer
Multifunction switch	Operation panel is equipped with the centralized switch where audio, auxiliary input and navigation, etc. operations are integrated. Connected with integral switch via hardwire and operation signal is transmitted to AV control unit via AV communication.
Preset switch	Connected with multifunction switch via hardwire, and operation signal is transmitted to AV control unit via AV communication.
Steering switch	Operations for audio, hands-free phone and navigation, etc. are possible. Steering switch signal (operation signal) is output to combination meter. Combination meter transmits steering switch signal to AV control unit via AV communication.
Microphone	Microphone is installed on the map lamp assembly. The microphone is used for the operation system of hands-free phone system, voice recognition function. The power is supplied from the TCU to the microphone, transmitting sound signals to the TCU at the during operation system of hands-free phone communication, and voice recognition. (With Telematics System) The power is supplied from the AV control unit to the microphone, transmitting sound signals to hands-free phone communication, and voice recognition. (Without Telematics System)
GPS antenna	GPS signal is received and transmitted to AV control unit.
Antenna amp.	Radio signal received by glass antenna (main) is amplified and transmitted to AV control unit. Power (antenna amp. ON signal) is supplied from AV control unit.
Satellite radio antenna *3	Receives the satellite radio waves and outputs it to AV control unit.

*1: 17 speakers models.

*2: 13 speakers models.

*3: With satellite radio antenna models.

AV Control Unit Input Signal (CAN Communication) 

Transmit unit	Signal name
ECM	Engine torque signal
	Engine speed signal
	Fuel consumption monitor signal
ABS actuator and electric unit (control unit)	Vehicle speed signal
	Slip status signal
Combination meter	Distance to empty signal
	Vehicle speed signal
BCM	System setting signal
	Door switch signal
TCM	Shift position signal

DESCRIPTION 

• Refer to Owner's Manual for Infiniti InTouch operating instructions.
• AV unit controls the Infiniti InTouch.
• Infiniti InTouch consists of the systems listed in the following table.

  System
  Audio system
  Hands-free phone system
  Navigation system
  Infiniti InTouch services
  Wi-Fi
  Apple CarPlay®
  Android Auto™

AUDIO SYSTEM 

Description 

Refer to Owner's Manual for audio system operating instructions.

• Audio system consists of the following functions.

  Function
  Radio
  USB connection
  Bluetooth® audio

• Audio system is controlled by AV control unit.

Radio 

• AM/FM radio
  • Radio signal for AM/FM radio is received by the antenna line printed on rear window.
  • There are main and sub lines for the print of antenna line. Main is used for AM and FM, and sub is used for FM.
    NOTE: For FM radio with FM diversity function, AV control unit selects from main or sub the antenna that receives the higher signal strength.
  • Antenna amp. is connected to the main antenna line, which receives the antenna amp. ON signal from the AV control unit, and transmits the antenna signal to the AV control unit after amplifying the AM or FM radio signal.
  • AV control unit transmits the sound signal to the each speaker when the antenna signal is received from the window antenna (main or sub).
• Satellite Radio (With satellite radio antenna models.)
  • Satellite radio tuner is built into AV control unit.
  • Sound signal (satellite radio) is received by satellite radio antenna and is transmitted to AV control unit. AV control unit outputs sound signal to each speaker.

USB Connection 

• USB port is located in the external data input box.
• When iPod® or USB memory is connected to the USB port, the external data input box transmits the music data and text data in iPod® or USB memory device to the AV control unit via USB communication.
• When AV control unit receives the text data from external data input box, it displays the text data (artist, album, and song title) on the display.

Bluetooth® 

• Bluetooth® module is integrated in the AV control unit.
• Music data, artist, album, and song title in a portable audio device can be played/displayed via Bluetooth® communication.
• When AV control unit receives the music data from a portable audio device via Bluetooth® communication, it transmits the sound signal to each speaker.
• When AV control unit receives the text data from a portable audio device via Bluetooth® communication, it displays the text data (artist, album, and song title) on the display.

HANDS-FREE PHONE SYSTEM 

Description 

• Refer to Owner's Manual for hands-free phone system operating instructions.
• Simply operating the steering switch without releasing hands from the steering wheel allows the driver to receive a phone call.
• When a Bluetooth® communication compliant phone is registered to the AV control unit, hands-free phone communication can be performed.
• The content of the memory (telephone book) of the cellular phone can be recorded in the AV control unit.

When Receiving a Call 

When AV control unit receives the voice of the other party from a cell phone via Bluetooth® communication, it transmits the TEL voice signal to each speaker.

When a Call Is Originated 

When AV control unit receives the microphone signal from microphone, it transmits the sound signal to a cell phone via Bluetooth® communication.

Hands-Free Phone Indicator 

• When AV control unit recognizes an incoming call from a cell phone via Bluetooth® communication, it transmits the meter display signal to combination meter via CAN communication.
• When combination meter receives the meter display signal, it displays the incoming call of cell phone on information display.
• When an incoming call is received, the driver can operate the steering switch to answer the phone.
• When steering switch is operated, the combination meter receives the steering switch signal, and then combination meter transmits the steering switch signal to the AV control unit via AV communication.
• When AV control unit receives the steering switch signal, it activates the hands-free phone.

NAVIGATION SYSTEM FUNCTION 

Description 

• Refer to Owner's Manual for navigation system operating instructions.
• Navigation system can be operated with the integral switch and multifunction switch.
• Guide sound during the operation of the navigation system is output from AV control unit via BOSE amp., to speakers.
• AV control unit calculates the vehicle location based on the signals from GYRO (angle speed sensor), vehicle sensor, and GPS satellite, as well as the map data.

Position Detection Principle 

The navigation system periodically calculates the vehicle's current position according to the following three signals:

• Travel distance of the vehicle as determined by the vehicle speed sensor.
• Turning angle of the vehicle as determined by the gyroscope (angular velocity sensor).
• Direction of vehicle travel as determined by the GPS antenna (GPS information).

The current position of the vehicle is then identified by comparing the calculated vehicle position with map data read from AV control unit (map-matching), and indicated on the screen as a vehicle mark. More accurate data is judged and used by comparing vehicle position detection results found by the GPS with the result by map-matching.

The current vehicle position will be calculated by detecting the distance the vehicle moved from the previous calculation point and its direction.

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• Travel distance

  Travel distance calculations are based on the vehicle speed sensor input signal. Therefore, the calculation may become incorrect as the tires wear down. To prevent this, an automatic distance correction function has been adopted.

  Travel direction

  Change in the travel direction of the vehicle is calculated by a gyroscope (angular velocity sensor) and a GPS antenna (GPS information). They have both advantages and disadvantages.

  Type	Advantage	Disadvantage
  Gyroscope (angular velocity sensor)	Can detect the vehicle's turning angle quite accurately.	Direction errors may accumulate when vehicle is driven for long distances without stopping.
  GPS antenna (GPS information)	Can detect the vehicle's travel direction (North/South/East/West).	Correct direction cannot be detected when vehicle speed is low.

  More accurate traveling direction is detected because priorities are set for the signals from these two devices according to the situation.

Map-matching 

Map-matching compares a current location detected by the method in the "Location Detection Principle" with a road map data from AV control unit (map data).

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The vehicle position may not be corrected under the following circumstances and after driving for a certain time when GPS information is difficult to receive.

• In map-matching, alternative routes to reach the destination will be shown and prioritized, after the road on which the vehicle is currently driven has been judged and the vehicle mark has been repositioned.

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  Alternative routes will be shown in different order of priority, and the incorrect road can be avoided if there is an error in distance and/or direction.

  They are of the same priority if two roads are running in parallel. Therefore, the vehicle mark may appear on either of them alternately, depending on maneuvering of the steering wheel and configuration of the road.

• Map-matching does not function correctly when a road on which the vehicle is driving is new and not recorded in the map data, or when road pattern stored in the map data and the actual road pattern are different due to repair.

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  The map-matching function may find another road and position the vehicle mark on it when driving on a road not present in the map. Then, the vehicle mark may change to it when the correct road is detected.

• Effective range for comparing the vehicle position and travel direction calculated by the distance and direction with the road data read from the map data is limited. Therefore, correction by map-matching is not possible when there is an excessive gap between current vehicle position and the position on the map.

GPS (Global Positioning System) 

GPS (Global Positioning System) is developed for and is controlled by the US Department of Defense. The system utilizes GPS satellites (NAVSTAR), transmitting out radio waves while flying on an orbit around the earth at an altitude of approximately 21, 000 km (13, 049 mile).

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The receiver calculates the travel position in three dimensions (latitude/longitude/altitude) according to the time lag of the radio waves that four or more GPS satellites transmit (three-dimensional positioning). The GPS receiver calculates the travel position in two dimensions (latitude/longitude) with the previous altitude data if the GPS receiver receives only three radio waves (two-dimensional positioning). GPS position correction is not performed while stopping the vehicle.

Accuracy of the GPS will deteriorate under the following conditions:

• In two-dimensional positioning, GPS accuracy will deteriorate when altitude of the vehicle position changes.
• The position of GPS satellite affects GPS detection precision. The position detection may not be precisely performed.
• The position detection is not performed if GPS receiver does not receive radio waves from GPS satellites. (Inside a tunnel, parking in a building, under an elevated highway etc.) GPS receiver may not receive radio waves from GPS satellites if any object is placed on the GPS antenna.