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Nissan Altima L32. Manual - part 64

AV-248

< FUNCTION DIAGNOSIS >

[BOSE AUDIO WITH NAVIGATION]

MULTI AV SYSTEM (SEDAN)

Component Description

INFOID:0000000004206531

AWNIA0761ZZ

Tweeter LH M51

Steering wheel audio control switches 3.

CD changer M42

Tweeter RH M52

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

Center speaker M151

Combination meter M24

Front door speaker
LH D3
RH D103

Rear subwoofer RH B124

10. Rear subwoofer LH B120

11. Rear door speaker

LH D202
RH D302

12. Antenna amp M502 (view with rear pil-

lar finisher RH removed)

13. BOSE speaker amp. B121, B122

14. Microphone R7

15. Rear view camera control unit B31

(view with trunk side finisher LH re-
moved)

16. Rear view camera B35

Part name

Description

AV control unit

• Integrates DVD-ROM drive allowing map data to be stored
• The AV control unit includes the navigation, audio, hands-free phone, satel-

lite radio and display functions

BOSE speaker amp.

Receives power (amp ON) and audio signals from AV control unit, and outputs
audio signals to each speaker.

CD changer

Outputs audio signals to AV control unit.

Front door speaker

• Outputs audio signal from BOSE speaker amp.
• Outputs high, mid and low range sounds

Tweeter

• Outputs audio signal from BOSE speaker amp.
• Outputs high range sound

Center speaker

• Outputs audio signal from BOSE speaker amp.
• Outputs high, mid and low range sounds

Rear door speaker

• Outputs audio signal from BOSE speaker amp.
• Outputs high, mid and low range sounds

Rear subwoofer

• Outputs audio signal from BOSE speaker amp.
• Outputs low range sound

Rear view camera control unit

• Camera image signal is input from rear view camera, and camera image is

indicated on the display

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

nection recognition signal

Rear view camera

• Receives camera ON signal from rear view camera control unit
• Sends image signal to rear view camera control unit

MULTI AV SYSTEM (SEDAN)

AV-249

< FUNCTION DIAGNOSIS >

[BOSE AUDIO WITH NAVIGATION]

Steering wheel audio control switches

• Operations for audio, hands-free phone and navigation are possible
• Steering switch signal (operation signal) is output to AV control unit

Microphone

Voice signals are received and sent to AV control unit.

GPS antenna

GPS signal is received and sent to AV control unit.

Antenna amp.

• Radio signal received by glass antenna is amplified and sent to AV control

unit

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

Satellite radio antenna

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

Part name

Description

AV-250

< FUNCTION DIAGNOSIS >

[BOSE AUDIO WITH NAVIGATION]

NAVIGATION SYSTEM (COUPE)

NAVIGATION SYSTEM (COUPE)

System Diagram

INFOID:0000000004206532

System Description

INFOID:0000000004206533

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

NAVIGATION SYSTEM (COUPE)

AV-251

< FUNCTION DIAGNOSIS >

[BOSE AUDIO WITH NAVIGATION]

from them 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 is a function that repositions the vehicle on the road

map when a new location is judged to be the most accurate. This is

done by comparing the current vehicle position, calculated by the

method described in the position detection principle, with the road

map data around the vehicle, read from the map DVD-ROM stored in

the DVD-ROM drive.

Therefore, the vehicle position may not be corrected after the vehicle

is driven over a certain distance or time in which GPS information is

hard to receive. In this case, the current-location mark on the display

must be corrected manually.

CAUTION:

The road map data is based on data stored in the map DVD-

ROM.

• 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 current-location mark has

been repositioned.

If there is an error in distance and/or direction, the alternative

routes will be shown in different order of priority, and the wrong

road can be avoided.

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.

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

the vehicle is driving is new and not recorded in the map DVD-

ROM, or when the road pattern stored in the map data and the

actual road pattern are different due to repair.

When driving on a road not present in the map, the map-matching

function may find another road and position the current-location

mark on it. Then, when the correct road is detected, the current-

location mark may leap to it.

• 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, when there is

an excessive gap between the current vehicle position and the

position on the map, correction by map-matching is not possible.

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 the ve-

hicle is driven for long distances without stop-
ping.

GPS antenna (GPS information)

• Can detect the vehicle's travel direction

(North/South/East/West).

• Correct direction cannot be detected when the

vehicle speed is low.

SEL685V

SEL686V

SKIA0613E

Content .. 62 63 64 65 ..