Infiniti G37 Coupe. Manual - part 156

 

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Infiniti G37 Coupe. Manual - part 156

 

 

AV

NAVIGATION SYSTEM

AV-377

< FUNCTION DIAGNOSIS >

[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 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.

• 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)

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-378

< FUNCTION DIAGNOSIS >

[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.
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 even with a high-precision three dimensional posi-

tioning.

• 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

AV

NAVIGATION SYSTEM

AV-379

< FUNCTION DIAGNOSIS >

[BOSE AUDIO WITH NAVIGATION]

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Component Parts Location

INFOID:0000000001680245

1.

Center speaker

2.

Tweeter LH

3.

Door squawker LH

4.

Door woofer LH

5.

Rear speaker LH

6.

Antenna amp.

7.

BOSE amp.

8.

Woofer amp.

9.

Rear woofer LH

10. Rear view camera

11. Camera control unit

12. Rear woofer RH

13. Rear speaker RH

14. Satellite radio antenna

15. Door woofer RH

16. Door squawker RH

17. Tweeter RH

18. Microphone

19. GPS antenna

20. iPod adapter

21. Steering switch

22. Steering angle sensor

23. Preset switch

24. Auxiliary input jacks

25. iPod connector

26. AV control unit

27. Multifunction switch

28. Display unit

A.

Within rear pillar finisher LH

B.

Trunk room LH

C.

Trunk room RH

D.

Instrument panel rear side

E.

Rear view of the display

F.

Spiral cable part

JPNIA0468ZZ

AV-380

< FUNCTION DIAGNOSIS >

[BOSE AUDIO WITH NAVIGATION]

NAVIGATION SYSTEM

Component Description

INFOID:0000000001558777

Part name

Description

AV CONTROL UNIT

• It is the master unit that controls each operation of the Navigation system.
• The HDD (Hard Disk Drive) is built in, and the map data is stored in HDD.
• The RGB signal (map information) is output to the display.
• The voice guidance signal is output to the BOSE amp.

DISPLAY UNIT

• Map image signal is input from AV control unit, and it is indicated on the dis-

play.

• Each operation of navigation can be performed by the touch panel function.

BOSE AMP.

Voice guidance signal is input from AV control unit, and it is output to front LH/
RH speakers.

DOOR WOOFER

Voice guidance signal from BOSE amp. is output.

DOOR SQUAWKER

TWEETER

MULTIFUNCTION SWITCH

• Each operation of navigation can be performed.
• Connected with preset switch via cable and operation signal is transmitted to 

AV control unit via AV communication. 

STEERING SWITCH

• Each operation of navigation, etc. can be performed.
• Switch operating signal is output to AV control unit.

GPS ANTENNA

GPS signal is received and is output to AV control unit.

 

 

 

 

 

 

 

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