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Nissan Quest E52. Manual - part 142

SYSTEM

AV-447

< SYSTEM DESCRIPTION >

[BOSE AUDIO WITH NAVIGATION]

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

AV Control Unit Input Signal (CAN Communication)

Around View Monitor Control Unit Input Signal (CAN Communication)

DESCRIPTION

Multi AV system means that the following systems are integrated.

COMMUNICATION SIGNAL

• 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).

• Two AV communication lines (H, L) adopt a twisted pair line that is resistant to noise.
• AV control unit is connected with front display unit and serial communication, and it transmits the required

signal of display and display control and receives the response signal from front display unit.

CAN COMMUNICATION

• 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.

• The AV control unit, which has the vehicle setting function, transmits and receives data on vehicle setting

condition via CAN communication with the BCM.

Transmit unit

Signal name

ECM

Engine status signal

Fuel consumption monitor signal

Steering angle sensor

Steering angle sensor signal

Combination meter

Vehicle speed signal

Distance to empty signal

Fuel level low warning signal

BCM

System setting signal

Around view monitor control unit

View change signal

Transmit unit

Signal name

AV control unit

Camera switch signal

Camera OFF signal

Steering angle sensor

Steering angle sensor signal

ABS actuator and electric unit (control unit)

Vehicle speed signal

FUNCTION NAME

Navigation system function

Audio function

DVD play function

Mobile entertainment system

Bluetooth

hands-free phone function

Auxiliary input function

USB connection function

Voice recognition function

Touch panel function

Around view monitor function

Vehicle information function

Auto Light adjustment system

AV-448

< SYSTEM DESCRIPTION >

[BOSE AUDIO WITH NAVIGATION]

SYSTEM

• Around view monitor control unit receives steering angle signal from steering angle sensor via CAN commu-

nication and performs control of predictive course line in front/rear view monitor image.

• When pressing the CAMERA switch, the AV control unit transmits camera switch signal to the around view

monitor control unit via CAN communication.

• When receiving camera switch signal, the around view monitor control unit displays a camera image on the

front display if an image other than camera image is displayed. If a camera image is displayed on the front
display, the around view monitor control unit displays a camera image by switching to other view.

• When necessary to switch to an image other than camera image, the AV control unit transmits camera OFF

signal to the around view monitor control unit via CAN communication.

• When receiving camera OFF signal, the around view monitor control unit brings the image output to the front

display into standby mode.

• When necessary to switch to a camera image, the around view monitor control unit transmits view change

signal to the AV control unit via CAN communication.

• When receiving view change signal, the AV control unit brings an image output to the front display into

standby mode.

• The around view monitor control unit judges the showing/hiding of a camera image according to vehicle

speed signal received from the ABS actuator and electric unit (control unit) via CAN communication.

TYPE OF VOICE SIGNAL

Reception Voice Signal

• Hands-free phone reception voice is output from the cellular phone through the AV control unit to the front

speaker via Bluetooth

communication.

• If the hands-free phone is used while the audio is ON and/or the voice guidance is being output, these

sounds are muted and only the reception voice is output.

Speech Sound Signal

Hands-free phone speech sound is transmitted from the microphone via the AV control unit and Bluetooth

communication to the cellular phone.

Guide Sound Signal

• Voice signals output during the route guidance of the navigation system are output from the AV control unit

to the front speaker.

• If the voice guidance is output with the audio ON, audio output of the front speaker is turned down 10 dB and

then voice guidance is output.

• Adjusting the volume while the voice guidance is being output can change the volume of the guidance.

NAVIGATION SYSTEM FUNCTION

Description

• The AV control unit controls navigation function while GPS tuner has built-in map data, GYRO (angle speed

sensor), on the HDD (Hard Disk Drive).

• The AV control unit inputs operation signal with communication signal, through display (touch panel) and

multifunction switch and steering switch.

• Guide sound is output to front speaker through BOSE amp. from AV control unit when operating navigation

system.

• A vehicle position is calculated with the GYRO (angle speed sensor), vehicle sensor, signal from GPS satel-

lite and map data stored on HDD (Hard Disk Drive), and transmits the map image signal (RGB image, RGB
area, RGB image synchronizing) to the display.

Position Detection Principle

The navigation system periodically calculates the current vehicle
position according to the following three types of signals.
• Travel distance of the vehicle as determined by the vehicle speed

sensor

• Vehicle turning angle determined by the gyroscope (angular speed

sensor)

• The travel direction of the vehicle 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, which is stored in the HDD
(Hard Disk Drive) (map-matching), and indicated on the screen with
a current location mark. More accurate data is used by comparing
position detection results from GPS to the map-matching.

JSNIA0177GB

SYSTEM

AV-449

< SYSTEM DESCRIPTION >

[BOSE AUDIO WITH NAVIGATION]

The current position is calculated by detecting the travel distance
from the previous calculation point, and its direction change.
• Travel distance

The travel distance is generated from the vehicle speed sensor
input signal. The automatic distance correction function is adopted
for preventing a miss-detection of the travel distance because of
tire wear etc.

• Travel direction

The gyroscope (angular velocity sensor) and GPS antenna (GPS
information) generate the change of the travel direction. Both have
advantages and disadvantages as per the following descriptions.

Input signals are prioritized in each situation. However, this order of priority may change in accordance with
more detailed travel conditions so that the travel direction is detected more accurately.

Map-matching

Map-matching repositions the vehicle on the road map when a new
location is judged to be more accurate. This is done by comparing
the current vehicle position (calculated by the normal position detec-
tion method) from the map data stored in the HDD (Hard Disk Drive).

There is a possibility that the vehicle position may not be corrected in the following case, and when vehicle is
driven over a certain distance or time in which GPS information is hard to receive. Correct manually the cur-
rent location mark on the screen.
• In map-matching, several alternative routes are prepared and pri-

oritized in addition to the road judged as currently driving on.
Therefore, due to errors in the distance and/or direction, an incor-
rect road may be prioritized, and the current location mark may be
repositioned to the incorrect road.
If two roads are running in parallel, they are of the same priority.
Therefore, the current location mark may appear on either of them
alternately, depending on maneuvering of the steering wheel and
configuration of the road, etc.

SEL684V

Type

Advantage

Disadvantage

Gyroscope (angular velocity
sensor)

The turning angle is precisely detected.

Errors are accumulated when driving a long dis-
tance without stopping.

GPS antenna (GPS informa-
tion)

The travel direction (North/South/East/West) is
detected.

The travel direction is not precisely detected when
driving slowly.

SEL685V

SEL686V

AV-450

< SYSTEM DESCRIPTION >

[BOSE AUDIO WITH NAVIGATION]

SYSTEM

• Map-matching does not function correctly when road on which the

vehicle is driving is new, etc. and not recorded in the map data.
Also, map-matching does not function correctly when road pattern
stored in the map data and the actual road pattern are different due
to repair, etc.
Therefore, the map-matching function judges other road as a cur-
rently driving road if the road is not in the map, and displays the
current location mark on it. Later, the current location mark may be
repositioned to the road if the correct road is detected.

• Effective range for comparing the vehicle position and travel direc-

tion calculated by the distance and direction with the road 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 satel-
lites (NAVSTAR), transmitting out radio waves while flying on an orbit
around the earth at an altitude of approximately 21,000 km (13,049
mile).
The receiver calculates the travel position in three dimensions (lati-
tude/longitude/altitude) according to the time lag of the radio waves
that four or more GPS satellites transmit (three-dimensional position-
ing). The GPS receiver calculates the travel position in two dimen-
sions (latitude/longitude) with the previous altitude data if the GPS
receiver receives only three radio waves (two-dimensional position-
ing). 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.

NOTE:
• The detection result has an error of approximately 10 m (32.81 ft) even with a high-precision three dimen-

sional positioning.

• There may be cases when the accuracy is lowered and radio waves are stopped intentionally because the

GPS satellite signal is controlled by the US trace control center.

AUDIO FUNCTION

Description

• BOSE

sound system (special digital amp. and 12 speakers) is adopted.

• The MP3/WMA/AAC playback function enables music to play for a long time: the user need not change the

CD during a long trip. The text display function is also adopted so that the title name and artist name of the
ID3 tag/WMA/AAC tag can be displayed.

• The audio system is equipped with the following functions.

Operating Signal

JSNIA0180GB

SEL526V

FUNCTION

AM/FM radio

Satellite radio

Bluetooth

audio

Speed sensitive volume

Content .. 140 141 142 143 ..