Nissan Altima L32. Instruction — 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
< FUNCTION DIAGNOSIS >
[BOSE AUDIO WITH NAVIGATION]
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NAVIGATION SYSTEM (SEDAN)
System Diagram
INFOID:0000000004206536
System Description
INFOID:0000000004206537
NOTE:
Refer to NAVI System Owner's Instruction 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
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