2003 NISSAN X-TRAIL Service Repair Manual

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Page 3929 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual AUDIO
AV-39
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Removal and Installation of Audio Unit (Without Casette Deck)EKS00ECQ
REMOVAL
1. Remove instrument cluster lid C. Refer to IP-11, "Removal and Installation" .
2

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NISSAN X-TRAIL 2003 Service Repair Manual AV-40
AUDIO

2. Remove screws (2) and remove tweeters.
INSTALLATION
Install in the reverse order of removal.
SKIA0002E

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NISSAN X-TRAIL 2003 Service Repair Manual AUDIO ANTENNA
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AUDIO ANTENNAPFP:28200
Antenna RouteEKS00ECV
Removal and Installation of Roof AntennaEKS00ECW
1. Remove headlining.
Refer to EI-39, "HEADLINING" in �

Page 3932 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual AV-42
NAVIGATION SYSTEM

NAVIGATION SYSTEMPFP:25915
System DescriptionEKS00F2S
The navigation system periodically calculates the vehicles current
position according to the following three signals: T

AV-42
NAVIGATION SYSTEM

NAVIGATION SYSTEMPFP:25915
System DescriptionEKS00F2S
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 sensor 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
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.
NOTE:
The road map data is based on data stored in the map DVD-ROM.
SKIA0370E
SEL684V
Type Advantage Disadvantage
Gyroscope (angular velocity sensor)
Can detect the vehicle's turning angle
quite accurately.Direction errors may accumulate when the
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
the vehicle speed is low.
SEL685V

Page 3933 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual NAVIGATION SYSTEM
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In map-matching, alternative routes to reach the destination will
be shown and prioritized, after the road on which the vehicle is
currently driven

NAVIGATION SYSTEM
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In map-matching, alternative routes to reach the destination will
be shown and prioritized, after the road on which the vehicle is
currently 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-match-
ing function may find another road and position the current-loca-
tion 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
direction 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)
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 position-
ing, 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.
SEL686V
SKIA0613E
SEL526V

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NISSAN X-TRAIL 2003 Service Repair Manual AV-44
NAVIGATION SYSTEM

COMPONENT DESCRIPTION
NAVI Control Unit
The gyro (angular speed sensor) and the DVD-ROM drive are
built-in units that control the navigation functions.
Signals are received

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NISSAN X-TRAIL 2003 Service Repair Manual NAVIGATION SYSTEM
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BIRDVIEW®
The BIRDVIEW® provides a detailed and easily seen display of road conditions covering the vehicles imme-
diate to distant area.
MAP D

Page 3936 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual AV-46
NAVIGATION SYSTEM

MAP DISPLAY
Function of each icon is as follows:
1. Azimuth indication.
2. Position marker.
–The tip of the arrow shows the current position. The shaft of the
arrow indicat

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