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Nissan Xterra. Manual - part 32

AV-120

< SYSTEM DESCRIPTION >

[NAVIGATION]

COMPONENT PARTS

SYSTEM DESCRIPTION

COMPONENT PARTS

Component Parts Location

INFOID:0000000009485257

AWNIA2939ZZ

COMPONENT PARTS

AV-121

< SYSTEM DESCRIPTION >

[NAVIGATION]

Component Description

INFOID:0000000009485258

Front tweeter LH M109

Steering wheel audio control switches 3.

AV control unit M38, M96, M97, M98,
M99, M100

Front tweeter RH M111

Microphone R8

GPS antenna (Underneath instrument
panel, forward of combination meter)

Front door speaker LH D12
Front door speaker RH D112

Rear tweeter LH D208
Rear tweeter RH D308

Rear door speaker LH D207
Rear door speaker RH D307

10. Audio amp. B158, B159 (Underneath

passenger seat)

11. Subwoofer B72 (Underneath rear LH

seat)

12. USB interface M214

13. AUX in jack M215

14. Rear view camera D506

15. Satellite antenna

16. Rod antenna

Part name

Description

AV control unit

• Operation of navigation and audio systems are integrated.
• Includes the audio, hands-free phone, navigation, satellite radio, rear view

monitor, USB connection and AUX IN connection functions.

• Map data can be loaded from SD-card inserted in SD-card slot.
• Audio signals are output to audio amplifier.
• Inputs illumination signals required for display dimming control.
• Inputs signals for driving status recognition (vehicle speed and reverse).
• Touch panel functions can be operated by touching display directly.

Map SD-card

A collection of Map data.

Audio amplifier

Receives audio signals from AV control unit and outputs audio signals to each
speaker.

Front tweeters

Outputs high, mid and low range audio signals from audio amp.

Front door speakers

Rear tweeters

Rear door speakers

Subwoofer

Steering wheel audio control switches

• Operations for audio, hands-free phone and voice recognition are possible.
• Steering switch signal is output to combination meter.
• Combination meter outputs steering switch signal to AV control unit.

Microphone

• Used for hands-free phone operations.
• Microphone signal is transmitted to AV control unit.
• Power is supplied from AV control unit.

USB interface

USB sound and data signals are transmitted to AV control unit.

AUX input

Auxillary sound signals are transmitted to AV control unit.

Rear view camera

• Outputs image of vehicle rear to AV control unit.
• Power is supplied from AV control unit.

Satellite antenna

Satellite radio signal is received and transmitted to AV control unit.

GPS antenna

GPS signal is received and transmitted to AV control unit.

Rod antenna

AM/FM signal is received and transmitted to AV control unit.

AV-122

< SYSTEM DESCRIPTION >

[NAVIGATION]

SYSTEM

SYSTEM

System Diagram

INFOID:0000000009485259

System Description

INFOID:0000000009485260

Refer to Owner’s Manual for navigation and audio system operating instructions.

Audio function and display are built into AV control unit.

This navigation has the following functions.

• Map data on SD-card
• Full support for playback of music from iPod

and USB device

• High resolution color 5.8 inch display with touch panel function

• FM/AM twin digital tuner

• USB mass storage connection

• Satellite radio

• Hands-free phone system
iPod

is a trademark of Apple inc., registered in the U.S. and other countries.

NAVIGATION SYSTEM FUNCTION

Description

• The navigation system can be operated by control panel of the AV control unit and display (touch panel) of

the AV control unit.

• Guide sound during the operation of the navigation system is output from AV control unit to front speakers.

• AV control unit calculates the vehicle location based on the signals from GYRO (angle speed sensor), vehi-

cle sensor, and GPS satellite, as well as the map data from map SD-card. The vehicle location is displayed

on the AV control unit.

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 the map SD-card (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.

AWNIA2777GB

SYSTEM

AV-123

< SYSTEM DESCRIPTION >

[NAVIGATION]

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.

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

SD-card.

NOTE:

The road map data is based on data stored in the map SD-card.

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.

Routes 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.

SEL684V

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

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