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Nissan Tiida C11. Manual - part 10

AV-34

< FUNCTION DIAGNOSIS >

[AUDIO WITH NAVIGATION]

MULTI AV SYSTEM

Component Description

INFOID:0000000001728630

Front door speaker
Driver side D12
Passenger side D112

Rear door speaker
LH D207
RH D307

Front tweeter
LH M109
RH M47

Steering wheel audio control switch-
es M102

Microphone R15

Part name

Description

NAVI CONTROL UNIT

• Map data can be read from the Map DVD-ROM by installing Map DVD-ROM.
• It is the master unit of the MULTI AV system, and it is connected to each con-

trol unit by means of communication. It operates each system according to
communication signals from the NAVI control unit.

• The NAVI control unit includes the audio, hands-free phone, navigation, and

vehicle information functions.

• It is connected to ECM and combination meter via CAN communication to ob-

tain necessary information for the vehicle information function.

• It inputs the illumination signals that are required for the display dimming con-

trol.

• It inputs the signals for driving status recognition (vehicle speed, reverse and

parking brake).

MAP DVD-ROM

A collection of Map data.

DISPLAY UNIT

• Display image is controlled by the serial communication from NAVI control

unit.

• RGB image signal is input from NAVI control unit (RGB, RGB area and RGB

synchronizing). Camera image signal is input from camera control unit.

• Synchronize signal (HP, VP) is output to NAVI control unit.

AV CONTROL UNIT

• Operational switch of MULTI AV system is integrated.
• NAVI control unit and AV communication are connected with AV control unit.

Operating signals of the switch are sent to the NAVI control unit.

FRONT DOOR SPEAKER

• Outputs sound signal from AV control unit.
• Outputs high, mid and low range sounds.

REAR DOOR SPEAKER

• Outputs sound signal from AV control unit.
• Outputs high, mid and low range sounds.

FRONT TWEETER

• Outputs sound signal from AV control unit.
• Outputs high range sound.

STEERING WHEEL AUDIO CONTROL SWITCH

• Operations for audio, hands-free phone, voice recognition and navigation,

etc. are possible.

• Steering switch signal (operation signal) is output to AV control unit.

MICROPHONE

• Used for hands-free phone operation and voice recognition.
• Mic. signal is sent to NAVI control unit.
• Power (Mic. VCC) is supplied from NAVI control unit.

GPS ANTENNA

GPS signal is received and sent to NAVI control unit.

RADIO ANTENNA

Radio signal received by antenna is sent to AV control unit.

NAVIGATION SYSTEM

AV-35

< FUNCTION DIAGNOSIS >

[AUDIO WITH NAVIGATION]

NAVIGATION SYSTEM

System Diagram

INFOID:0000000001728631

System Description

INFOID:0000000001728632

NAVIGATION SYSTEM

Location 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 the map DVD-
ROM, which is stored in the DVD-ROM drive (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 dis-
tance the vehicle moved from the previous calculation point and its
direction.
• Travel distance

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

• Travel direction

Change in the travel direction of the vehicle is calculated by a gyro-
scope (angular velocity sensor) and a GPS antenna (GPS informa-
tion). They have both advantages and disadvantages.

JPNIA0157GB

SKIB1058E

SEL684V

AV-36

< FUNCTION DIAGNOSIS >

[AUDIO WITH NAVIGATION]

NAVIGATION SYSTEM

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 Map
DVD-ROM stored in DVD-ROM drive.
NOTE:
The road map data is based on data stored in the map DVD-ROM.

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 this case, the vehicle mark on the display must be cor-
rected manually.
• In map-matching, alternative routes to reach the destination will be

shown and prioritized, after the road on which the vehicle is cur-
rently driven has been judged and the vehicle mark has been repo-
sitioned.
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 alter-
nately, depending on maneuvering of the steering wheel and con-
figuration 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 DVD-
ROM, or when road pattern stored in the map data and the actual
road pattern are different due to repair.
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 direc-

tion calculated by the distance and direction with the road data
read from the map DVD-ROM 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)

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.

SEL685V

SEL686V

SKIA0613E

NAVIGATION SYSTEM

AV-37

< FUNCTION DIAGNOSIS >

[AUDIO WITH NAVIGATION]

GPS (Global Positioning System) was developed for and is con-
trolled by the US Department of Defense. The system utilizes GPS
satellites (NAVSTAR), sending out radio waves while flying on an
orbit around the earth at an altitude of approximately 21,000 km
(13,100miles).
The GPS receiver calculates the vehicle's position in three dimen-
sions (latitude/longitude/altitude) according to the time lag of the
radio waves received from four or more GPS satellites (three-dimen-
sional positioning). The GPS receiver calculates the vehicle's posi-
tion in two dimensions (latitude/longitude), utilizing the altitude data
calculated previously with radio waves from four or more GPS satel-
lites (two-dimensional positioning) if radio waves were received only
from three GPS satellites.
Position correction by GPS is not available 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 accuracy can be even lower depending on the arrangement of the GPS satellites utilized for the posi-

tioning.

• Position detection is not possible when vehicle is in an area where radio waves from the GPS satellite do not

reach, such as in a tunnel, parking lot in a building, and under an elevated highway. Radio waves from the
GPS satellites may not be received when some object is located over the GPS antenna.

NOTE:
• Even a high-precision three dimensional positioning, the detection result has an error about 10 m (30ft).
• Because the signals of GPS satellite is controlled by the Tracking and Control Center in the United States,

the accuracy may be degraded lower intentionally or the radio waves may stop.

Traffic Information (RDS-TMC)

NOTE:This system is built-in NAVI control unit.
The traffic information broadcast allows to you to avoid delays due to traffic incidents.
Traffic jams, roadwork, closed roads around your current location, etc. are represented graphically on the map
by icons depicting the nature of the event.
Incidents on the route are automatically brought to your attention when they are approached.
The Traffic Information feature gives you the opportunity to forecast traffic incidents, determine how serious
they are, via the guidance mode, and allows you to detour around traffic incidents.
The navigation system receives traffic information from best available sources and enables the RDS-TMC
(Radio Data System-Traffic Information Channel) to inform and guide you.
The RDS-TMC broadcast is fed by a dedicated FM tuner so that you can still tune your radio station while Traf-
fic Information is being broadcasted.

Component Parts Location

INFOID:0000000001728633

Refer to

AV-33, "Component Parts Location"

Component Description

INFOID:0000000001728634

SEL526V

Part name

Description

NAVI CONTROL UNIT

• The master unit controls each operation of the Navigation system.
• Map data can be read from the Map DVD-ROM by installing Map DVD-ROM.
• The RGB signal (map information) is output to the display.
• The voice guidance signal is output to the audio unit.

MAP DVD-ROM

A collection of Map data

DISPLAY UNIT

Map image signal is input from NAVI control unit, and it map image indicated on
the display.

AUDIO UNIT

• Voice guidance signal is input from NAVI control unit, and it is output to front

LH/RH speakers.

• Each operation of navigation can be performed.

FRONT DOOR SPEAKER

Voice guidance signal from audio unit is output.

FRONT TWEETER

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