Nissan Murano Z51. Manual - part 198

AV

MULTI AV SYSTEM

AV-571

< SYSTEM DESCRIPTION >

[BOSE AUDIO WITH NAVIGATION]

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CAMERA CONTROL UNIT

• Camera image signal is input from rear view camera. Camera image signal 

output to front display unit.

• Power (camera ON signal) is transmitted to rear view camera.
• Controlled by AV communication transmitted from AV control unit.
• AV control unit recognizes the presence of camera system with camera con-

nection recognition signal.

REAR VIEW CAMERA

• The image of vehicle rear view is transmitted to camera control unit.
• It receives the power (camera ON signal) from the camera control unit and op-

erates.

STEERING ANGLE SENSOR

Steering signal necessary for possible route line control is transmitted to camera 
control unit.

MICROPHONE

• Used for hands-free phone operation and voice recognition.
• Mic signal is transmitted to AV control unit.
• The power (Mic. power supply) is supplied from the AV control unit.

AUXILIARY INPUT JACKS

AUX image signal of auxiliary input is transmitted to front display, and sound sig-
nal is transmitted to AV control unit.

GPS ANTENNA

GPS signal is received and transmitted to AV control unit.

ANTENNA BASE

An antenna base integrated with radio antenna amp. and satellite radio antenna 
is adopted.

ANTENNA AMP.

• Radio signal received by rod antenna is amplified and transmitted to AV control 

unit.

• Power (antenna amp. ON signal) is supplied from AV control unit.

SATELLITE RADIO ANTENNA

• Receives the satellite radio wave and outputs it to the AV control unit.

iPod ADAPTER

• Inputs iPod sound signal from iPod

®

, and outputs iPod sound signal to AV con-

trol unit.

• Receiving/transmitting of iPod

®

 operation signals are performed as follows:

- between AV control unit and iPod adapter: AV communication.

- between iPod

®

 and iPod adapter: serial communication.

Part name

Description

AV-572

< SYSTEM DESCRIPTION >

[BOSE AUDIO WITH NAVIGATION]

NAVIGATION SYSTEM

NAVIGATION SYSTEM

System Diagram

INFOID:0000000005528679

System Description

INFOID:0000000005528680

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 front display unit.

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.
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.

JSNIA0908GB

JSNIA0177GB

SEL684V

AV

NAVIGATION SYSTEM

AV-573

< SYSTEM DESCRIPTION >

[BOSE AUDIO WITH NAVIGATION]

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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 the when vehicle is driven over a certain
distance or time in which GPS information is hard to receive. Manually correct the current location mark on the
screen.
• Map-matching detects, prepares, and prioritizes several alternative

routes in addition to the road detected as currently being driven 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.

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

the vehicle is driving is new, etc. and not recorded in the map data.
In addition map-matching does not function correctly when the
road pattern stored in the map data and the actual road pattern are
different due to repair, etc.
Therefore, the map-matching function detects other roads as a
currently 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 the real-time vehicle position and the position on the map.

GPS (GLOBAL POSITIONING SYSTEM)

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

JSNIA0180GB

AV-574

< SYSTEM DESCRIPTION >

[BOSE AUDIO WITH NAVIGATION]

NAVIGATION 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 the vehicle is
stopped.

Accuracy of 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.

SEL526V