2001 NISSAN ALMERA Service Manual

trunk release radio controls warning door lock radio antenna trailer

Page 2009 of 2898

NISSAN ALMERA 2001 Service Manual Component Parts LocationNJEL0515
SEL501X
NAVIGATION SYSTEM
Component Parts Location
EL-451

Page 2010 of 2898

NISSAN ALMERA 2001 Service Manual SEL504X
System DescriptionNJEL0516OUTLINENJEL0516S01The Navigation System (Multi-AV System) relies upon three sens-
ing devices in order to determine vehicle location at regular time
intervals.
1. Veh

SEL504X
System DescriptionNJEL0516OUTLINENJEL0516S01The Navigation System (Multi-AV System) relies upon three sens-
ing devices in order to determine vehicle location at regular time
intervals.
1. Vehicle speed sensor: Determines the distance the vehicle has
traveled.
2. Gyro (Angular velocity sensor): Determines vehicle steering
angle and directional change.
3. GPS antenna (GPS data): Determines vehicle forward move-
ment and direction.
The data provided by the three sensing functions together with a
comparison of the mapping information read from the CD-ROM
drive permit accurate determination of the vehicle's current location
and subsequent course (map matching). The information appears
on a liquid crystal display.
This comparison of GPS data (vehicle position sensing) and map
matching permits precise determination of vehicle location.
SEL684V
Position Sensor Operating PrinciplesNJEL0516S0101The sensor determines current vehicle location by calculating the
previously sensed position, the distance traveled from this position,
and the directional changes occurring during this travel.
1. Distance traveled
The distance traveled is calculated using signals received from
the vehicle speed sensor. The sensor automatically compen-
sates for the slightly reduced wheel and tire diameter resulting
from tire wear.
2. Forward movement (Direction)
Changes in the direction of forward movement are calculated
by the gyro (angular velocity sensor) and the GPS antenna
(GPS data). Each of these functions has its advantage and
disadvantages. Depending upon conditions, one function takes
precedence over the other to accurately determine the direc-
tion of forward movement.
Function type Advantage Disadvantage
Gyro (Angular
velocity sen-
sor)+Able to accurately detect
minute changes in steering
angle and direction.+Calculation errors may
accumulate over a long
period of continuous
vehicle travel.
GPS antenna
(GPS data)+Able to sense vehicle travel
in four general directions
(North, South, East, and
West)+Unable to detect direction
of vehicle travel at low
vehicle speeds.
NAVIGATION SYSTEM
System Description
EL-452

Page 2011 of 2898

NISSAN ALMERA 2001 Service Manual SEL685V
Map MatchingNJEL0516S0102Map matching allows the driver to compare the sensed vehicle
location data with the road map contained in the CD-ROM drive.
Vehicle position is marked on the CD-ROM ma

SEL685V
Map MatchingNJEL0516S0102Map matching allows the driver to compare the sensed vehicle
location data with the road map contained in the CD-ROM drive.
Vehicle position is marked on the CD-ROM map. This permits the
driver to accurately determine his/her present position on the high-
way and to make appropriate course decisions.
When GPS data reception is poor during travel, the vehicle posi-
tion is not amended. At this time, manual manipulation of the CD-
ROM map position marker is required.
SEL686V
Map matching permits the driver to make priority judgments about
possible appropriate roads other than the one currently being trav-
eled.
If there is an error in the distance or direction of travel, there will
also be an error in the relative position of other routes. When two
routes are closely parallel to one another, the indicated position for
both routes will be nearly the same priority. This is so that, slight
changes in the steering direction may cause the marker to indicate
both routes alternately.
SEL687V
Newly constructed roads may not appear on the CD-ROM map. In
this case, map matching is not possible. Changes in the course of
a road will also prevent accurate map matching.
When driving on a road not shown on the CD-ROM map, the posi-
tion marker used for map matching may indicate a different route.
Even after returning to a route shown on the map, the position
marker may jump to the position currently detected.
SEL526V
GPS (Global Positioning System)NJEL0516S0103GPS is the global positioning system developed and operated by
the US Department of Defense. GPS satellites (NAVSTAR) trans-
mit radio waves and orbit around the earth at an altitude of approxi-
mately 21,000 km (13,000 miles).
GPS receiver calculates the three-dimensional position of the
vehicle (latitude, longitude, and altitude from the sea level) by the
time difference of the radio wave arriving from more than four GPS
satellites (three-dimensional positioning).
When the radio wave is received from only three GPS satellites, the
two-dimensional position (latitude and longitude) is calculated,
using the altitude from the sea level data calculated by using four
GPS satellites (two-dimensional positioning).
Positioning capability is degraded in the following cases.
+In two-dimensional positioning, when the vehicle's altitude
from the sea level changes, the precision becomes lower.
+The location detection performance can have an error of about
100 m (300 ft) even in three-dimensional positioning with high
precision. Because the precision is influenced by the location
of GPS satellites used for positioning, the location detection
performance may drop depending on the location of GPS sat-
ellites.
+When the radio wave from GPS satellites cannot be received,
NAVIGATION SYSTEM
System Description (Cont'd)
EL-453

Page 2012 of 2898

NISSAN ALMERA 2001 Service Manual for example, when the vehicle is in a tunnel, in a parking lot
inside building, under an elevated superhighway or near strong
power lines, the location may not be detected. Turbulent/
electric weather

Page 2013 of 2898

NISSAN ALMERA 2001 Service Manual MAP DISPLAY
BIRDVIEW
R
SEL524X
BIRDVIEWTNJEL0516S0205The BIRDVIEWTprovides a detailed and easily seen display of
road conditions covering the vehicles immediate to distant area.
SEL691V
DescriptionNJ

Page 2014 of 2898

NISSAN ALMERA 2001 Service Manual MAP DISPLAY=NJEL0516S03
SEL525X
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 indicates the dire

Page 2015 of 2898

NISSAN ALMERA 2001 Service Manual FUNCTION OF PANEL SWITCH=NJEL0516S04Display with Pushed ªDESTº SwitchNJEL0516S0401
SEL615X
The function of each icon is as follows:
Icon Description
Address Book Favorite areas can be saved to memor

Page 2016 of 2898

NISSAN ALMERA 2001 Service Manual Display with Pushed ªROUTEº Switch=NJEL0516S0402
SEL526X
The function of each icon is as follows:
Icon Description
Quick StopSelect facility is set as destination or waypoint.
(Route guidance has be

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