Audio, Visual & Navigation System (Base Without Navigation) -- M37/M56: Overview Infiniti M56 IV

Component Description

PARTS DESCRIPTION CHART

Scheme 1

Note. The name MULTIFUNCTION SWITCH indicates the integration of PRESET SWITCH and MULTIFUNCTION SWITCH virtually.

MULTI AV SYSTEM : System Description

Multi AV system means that the following systems are integrated.

FUNCTION NAME

COMMUNICATION SIGNAL

1. AV control unit function by transmitting/receiving data one by one with each unit (slave unit) that configures them completely as a master unit by connecting between units that configure MULTI AV system with two AV communication lines (H, L).
2. Two AV communication lines (H, L) adopt a twisted pair line that is resistant to noise.
3. The AV control unit is connected by CAN communication, and it receives data signal from ECM and combination meter. It computes and displays fuel economy information value with the obtained information.
4. The AV control unit is connected with display unit and serial communication, and it transmits the required signal of display and display control and receives the response signal from display unit.
5. The AV control unit is receives a steering angle signal from the steering angle sensor via CAN communication and controls an expected course line during rear view monitor operation.

AUDIO FUNCTION

The audio system is equipped with the following functions. Each function is operated with multifunction switch, preset switch or steering switch. Operation status of audio is indicated at display unit.

AUDIO FUNCTIONS

Operating Signal

Audio system operation can be performed with multifunction switch, preset switch or steering switch.

1. Operating signal is transmitted to AV control unit with AV communication when it is operated by multifunction switch or preset switch. The disk ejection operating signal is performed by hardwire.
2. Operating signal is transmitted to AV control unit with steering switch signal when it is operated by steering switch.

Screen Display

1. Switching of display is performed with serial communication between display unit and AV control unit.
2. The image signal to display operating condition is performed with RGB image signal, RGB area signal and RGB image synchronizing signal.

AM/FM Radio Mode

1. AM/FM radio tuner is built into AV control unit.
2. Sound signals (AM/FM radio) are received via window antenna.
3. AM/FM main antenna signal is amplified via antenna amp. and FM sub antenna signal is transmitted to AV control unit.
4. AV control unit outputs sound signal is input to active noise control unit, and active noise control unit outputs to each speaker.

Satellite Radio Mode

1. Satellite radio tuner is controlled by communication signal and request signal with AV control unit.
2. Sound signal (satellite radio) is received by satellite radio antenna and transmitted to AV control unit via satellite radio tuner. AV control unit is output the sound signal (satellite radio) to active noise control unit.

CD Mode

1. CD function is built into AV control unit.
2. AV control unit outputs the sound signal to active noise control unit, and active noise control unit output the signal to each speaker during playback.

USB Connection Function

1. Connecting iPod® or USB memory allows the driver to play iPod® music files or USB memory-stored music files.
2. Sound signals of music files stored in iPod® or USB memory is transmitted from the USB connector to the AV control unit. The AV control unit transmits the sound signals to the each speaker via active noise control unit.
3. iPod® is recharged when connected to USB connector.
4. Only files that meet the following conditions will be played. FILE FORMATS Music file File format "MP3", "WMA" File extension ".mp3", ".wma" Maximum file size 2 GB NOTE: iPod® is a trademark of Apple inc., registered in the U.S. and other countries. Image signals cannot be received from iPod® or USB memory. Use the enclosed USB harness when connecting iPod® to USB connector.

Active Noise Control System

Scheme 2

1. The active noise control system outputs an anti-phase sound from the speakers (front door speaker and rear door speaker) against unpleasant engine booming noise (2nd and/or 3rd engine rev at 700 - 5000 RPM) and reduce sound pressure level by the interference with engine booming noise.
2. The active noise control unit receives an engine speed signal from ECM and receives microphone signals from the front and rear microphone.
3. The active noise control unit receives a door state signal. The active noise control system does not operate with any door open.
4. Based on signals detected by the front and rear microphones, the active noise control unit generates an anti-phase sound (microphone signal) weakening interior engine booming noise in real time according to a unique algorithm*1 by a micro computer built in the active noise control unit. Then, the active noise control unit mixes the anti-phase sound with a sound signal received from the AV control unit to transmit the mixed sound signal to each speaker. NOTE: *1: Algorithm means a fixed procedure to solve a question.

HANDS-FREE PHONE SYSTEM

1. TEL adapter unit is controlled with AV communication from AV control unit.
2. The connection between cellular phone and TEL adapter unit is performed with Bluetooth™ communication.
3. The voice guidance signal is input from the TEL adapter unit to the AV control unit and output to the front speaker when operating the cellular phone.
4. TEL adapter unit has the on board self-diagnosis function. Refer to " «ON BOARD DIAGNOSIS FUNCTION»(ref-390442-S36768596122011032800000) ".

When A Call Is Originated

1. Spoken voice sound output from the microphone (microphone signal) is input to TEL adapter unit.
2. TEL adapter unit outputs to cellular phone with Bluetooth™ communication as a TEL voice signal.
3. Voice sound is then heard at the other party.

When Receiving A Call

1. Voice sound is input to own cellular phone from the other party.
2. TEL voice signal is input to TEL adapter unit by establishing Bluetooth™ communication from cellular phone, and the signal is output to front speaker.

REAR VIEW MONITOR FUNCTION

1. The AV control unit supplies power to the rear view camera when receiving a reverse signal.
2. The rear view camera transmits camera images to the AV control unit when power is supplied from the AV control unit.
3. The AV control unit transmits a warning message, fixed guide lines, and predictive course lines to the display unit by RGB image signal. Rear view monitor images are displayed by combining the RGB image signal and the camera image signals from the rear view camera.
4. Predictive course lines are controlled by a steering angle sensor signal received the AV control unit via CAN communication.

VEHICLE INFORMATION FUNCTION

Status of audio, climate control system, fuel economy and maintenance etc. are displayed.

Description

1. The AV control unit diagnosis function starts up with multifunction switch operation and the AV control unit performs a diagnosis for each unit in the system during the on board diagnosis.
2. Perform a CONSULT-III diagnosis if the on board diagnosis does not start, e.g., the screen does not display anything, the multifunction switch does not function, etc.

ECU IDENTIFICATION

The part number of AV control unit is displayed.

1. Since vehicle specifications are not included in the AV control unit after replacement, it is required to write vehicle specifications with CONSULT-III.
2. Configuration has three functions as follows. CONFIGURATION FUNCTIONS DESCRIPTION CHART Function Description READ CONFIGURATION Reads the vehicle configuration of current AV control unit. Saves the read vehicle configuration. WRITE CONFIGURATION-Manual selection Writes the vehicle configuration with manual selection. WRITE CONFIGURATION-Config file Writes the vehicle configuration with saved data.

CAN (Controller Area Network) is a serial communication line for real-time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independently). In CAN communication, control units are connected with 2 communication lines (CAN-H, CAN-L) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.

CAN Communication Signal Chart. Refer to " CAN COMMUNICATION SYSTEM : CAN COMMUNICATION SIGNAL CHART ".

U1300 is indicated when malfunction occurs in communication signal of multi AV system. Indicated simultaneously, without fail, with the malfunction of control units connected to AV control unit with communication line. Determine the possible malfunction cause from the table below.

Transmit the image displayed with AV control unit with RGB signal to the display unit.

Transmit the image displayed with AV control unit with RGB signal to the display unit.

Transmit the image displayed with AV control unit with RGB signal to the display unit.

Transmit the RGB synchronizing signal to the display unit so as to synchronize the RGB image displayed with AV control unit.

Transmits the display area of RGB image displayed by AV control unit with RGB area (YS) signal to display unit.

1. AV control unit outputs camera power supply to rear view camera and inputs rear view camera image signal from rear view camera when the reverse signal is input.
2. The AV control unit that inputs the camera image signal transmits the camera image signal to the display unit.

AV control unit that inputs the camera image signal transmits the composite image signal to the display unit.

In composite image (camera image), transmit the vertical synchronizing (VP) signal and horizontal synchronizing (HP) signal from display unit to AV control unit so as to synchronize the RGB images displayed with AV control unit such as the image quality adjusting menu, etc.

In composite image (camera image), transmit the vertical synchronizing (VP) signal and horizontal synchronizing (HP) signal from display unit to AV control unit so as to synchronize the RGB images displayed with AV control unit such as the image quality adjusting menu, etc.

The eject signal is output to AV control unit when the eject switch of multifunction switch is pressed.

Supply power from TEL adapter unit to microphone. The microphone transmits the sound/voice to the microphone.

TEL adapter unit identifies the vehicle model according to the control signal and performs the control.

Transmits the steering switch signal to AV control unit.

Transmits the steering switch signal to AV control unit.

Transmits the steering switch signal to AV control unit.

OPERATION

MULTI AV SYSTEM SYMPTOMS CHART

BASIC OPERATIONS

BASIC OPERATIONS SYMPTOM CHART

See also:
• CAN COMMUNICATION SYSTEM : CAN COMMUNICATION SIGNAL CHART