Nissan Altima L32. Manual - part 65

AV-252

< FUNCTION DIAGNOSIS >

[BOSE AUDIO WITH NAVIGATION]

NAVIGATION SYSTEM (COUPE)

GPS (Global Positioning System) has been developed and con-

trolled by the US Department of Defense. The system utilizes GPS

satellite (NAVSTAR), sending out radio waves while flying on an orbit

around the earth at the height of approx. 21,000 km (13,000 miles).

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). If radio waves were received only from three

GPS satellites, the GPS receiver calculates the vehicle's position in

two dimensions (latitude/longitude), utilizing the altitude data calcu-

lated previously by using radio waves from four or more GPS satel-

lites (two-dimensional positioning).

Accuracy of the GPS will deteriorate under the following conditions.

• In two-dimensional positioning, the GPS accuracy will deteriorate when the altitude of the vehicle position

changes.

• There may be an error of approximately 10 m (30 ft.) in position detected by three-dimensional positioning,

which is more accurate than two-dimensional positioning. The accuracy can be even lower depending on the

arrangement of the GPS satellites utilized for the positioning.

• Position detection is not possible when the 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.

• Position correction by GPS is not available while the vehicle is stopped.

SEL526V

AV

NAVIGATION SYSTEM (COUPE)

AV-253

< FUNCTION DIAGNOSIS >

[BOSE AUDIO WITH NAVIGATION]

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Component Parts Location

INFOID:0000000004206534

ALNIA0941GB

1.

Front tweeter LH M51

2.

Steering wheel audio control switches 3.

CD changer M42

4.

Front tweeter RH M52

5.

AV control unit M46, M47, M48, M81, 
M90, M91

6.

Center speaker M151

AV-254

< FUNCTION DIAGNOSIS >

[BOSE AUDIO WITH NAVIGATION]

NAVIGATION SYSTEM (COUPE)

Component Description

INFOID:0000000004206535

7.

Combination meter M24

8.

Aux Jack M41

9.

Door speaker
LH D3
RH D103

10. Rear subwoofer

LH B25
RH B47

11. Rear tweeter

LH B16
RH B100

12. BOSE speaker amp. B121, B122 (view 

with trunk carpet and RH floor spacer 
removed)

13. Microphone R7

14. Rear view camera control unit B31 

(view with trunk side finisher LH re-
moved)

15. Rear view camera T7

Part name

Description

AV control unit

• Controls each operation of the navigation system
• DVD-ROM drive is built in
• Voice guidance signal is output to BOSE speaker amp.

BOSE speaker amp.

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

Front tweeter

Voice guidance signal from BOSE speaker amp. is output.

Steering wheel audio control switches

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

Microphone

Sends voice signals to AV control unit

GPS antenna

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

AV

NAVIGATION SYSTEM (SEDAN)

AV-255

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[BOSE AUDIO WITH NAVIGATION]

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NAVIGATION SYSTEM (SEDAN)

System Diagram

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System Description

INFOID:0000000004206537

NOTE:

Refer to NAVI System Owner's Manual for system operation.

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 sen-

sor), and the 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 with a current-location mark.

By comparing the vehicle position detection results found by the

GPS and by map-matching, more accurate vehicle position data can

be used.

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 input signal. Therefore, the calculation may

become incorrect as the tires wear down. To prevent this, an automatic distance fine adjustment function has

been adopted.

TRAVEL DIRECTION 

Change in the travel direction of the vehicle is calculated by a gyroscope (angular velocity sensor) and a GPS

antenna (GPS information). As the gyroscope and GPS antenna have both merit and demerit, input signals

AWNIA0053GB

AWNIA0054GB

SEL684V