2008 INFINITI FX35 Service Manual

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Page 633 of 3924

INFINITI FX35 2008 Service Manual
AV-86
< SERVICE INFORMATION >
INTEGRATED DISPLAY SYSTEM
Example of Symptom Poss ible No Malfunction
INFOID:0000000001328735
For system operation informati on, refer to Owners Manual.
DISPLAY
Removal

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INFINITI FX35 2008 Service Manual
NAVIGATION SYSTEMAV-87
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NAVIGATION SYSTEM
System DescriptionINFOID:0000000001328739
For Navigation System operation information, refer to Nav

Page 635 of 3924

INFINITI FX35 2008 Service Manual
AV-88
< SERVICE INFORMATION >
NAVIGATION SYSTEM
The navigation system periodically calculates the vehicles current
position according to the following three signals:
Travel distance of the vehicle

AV-88
< SERVICE INFORMATION >
NAVIGATION SYSTEM
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 sensor)
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 DVD-ROM,
which is stored in the DVD-ROM drive (map-matching), and indi-
cated on the screen as a current-loc ation mark. More accurate data
is judged and used by comparing vehicle position detecti on results found by the GPS with the result by map-
matching.
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 sen-
sor input signal. Therefore, the calculation may become incorrect
as the tires wear down. To prevent this, an automatic distance cor-
rection function has been adopted.
Travel direction Change in the travel direction of the vehicle is calculated by a gyro-
scope (angular velocity sensor) and a GPS antenna (GPS informa-
tion). They have both advantages and disadvantages.
More accurate traveling direction is selected because pr iorities are set for the signals from these two devices
according to the situation.
Map-Matching
Map-matching compares a current location detected by the method
in the “Location Detection Principle” with a road map data from DVD-
ROM stored in DVD-ROM drive.
NOTE:
The road map data is based on data stored in the DVD-ROM.
The vehicle position may not be corrected under the following circumstances and after driving for a certain
time when GPS information is difficult to receive. In th is case, the current-location mark on the display must be
corrected manually.
SKIB1058E
SEL684V
Type Advantage Disadvantage
Gyroscope (angular velocity sen-
sor) Can detect the vehicle's turning angle quite
accurately. Direction errors
may accumulate when 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 vehicle
speed is low.
SEL685V
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

Page 636 of 3924

INFINITI FX35 2008 Service Manual
NAVIGATION SYSTEMAV-89
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In map-matching, alternative routes are prepared and prioritized in addition to the road judged currently driven. Due

NAVIGATION SYSTEMAV-89
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In map-matching, alternative routes are prepared and prioritized in addition to the road judged currently driven. Due to the distance
and/or direction error, the incorrect road may be prioritized and
current-location mark may be repositioned to the wrong road.
When two roads are running in parallel, they are judged to the
same priority. Therefore, the current-location mark may appear on
either of them alternately, depending on maneuvering of the steer-
ing wheel and configuration of the road.
Map-matching does not function correctly when a road on which the vehicle is driving is new and not recorded in the DVD-ROM, or
when road pattern stored in the map data and the actual road pat-
tern 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 correc t road is detected, the current-
location mark may change 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 DVD-ROM is limited. Therefore, when there is an
excessive gap between current vehicle position and the position on
the map, correction by map-matching is not possible.
GPS (Global Positioning System)
GPS (Global Positioning System) was developed for and is con-
trolled by the US Department of Defense. The system utilizes GPS
satellites (NAVSTAR), sending out radio waves while flying on an
orbit around the earth at an altitude of approximately 21,000 km
(13,100 miles).
The GPS receiver calculates the vehicle's position in three dimen-
sions (latitude/longitude/altitude) ac cording 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 ca lculates the vehicle's position in
two dimensions (latitude/longitude) , and utilize the altitude data cal-
culated previously with radio waves from four or more GPS satellites
(two-dimensional positioning).
Position correction by GPS is not available while the vehicle is stopped.
Accuracy of GPS will deteriorate under the following conditions:
In two-dimensional positioning, GPS accuracy will deter iorate when altitude of the vehicle position changes.
The accuracy can be even lower depending on the arrangement of the GPS satellites utilized for the posi-
tioning.
Position detection is not possible when 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 so me object is located over the GPS antenna.
NOTE:
Even a high-precision three dimensional positioning, the detection result has an error about 10 m (30ft).
Because the signals of GPS satellite is controlled by the Tracking and Control Center in the United States,
the accuracy may be degraded lower intentionally or the radio waves may stop.
Component DescriptionINFOID:0000000001328740
NAVI CONTROL UNIT
SEL686V
SKIA0613E
SEL526V
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

Page 637 of 3924

INFINITI FX35 2008 Service Manual
AV-90
< SERVICE INFORMATION >
NAVIGATION SYSTEM
The gyro (angular speed sensor) and the DVD-ROM drive arebuilt-in units that control the navigation functions.
Signals are received from the gyro,

Page 638 of 3924

INFINITI FX35 2008 Service Manual
NAVIGATION SYSTEMAV-91
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Images on the display include RGB image such as map screen.
Display control unit controls images on the display.
A/C

Page 639 of 3924

INFINITI FX35 2008 Service Manual
AV-92
< SERVICE INFORMATION >
NAVIGATION SYSTEM
Schematic - NAVI -
INFOID:0000000001328743
TKWM4404E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F

Page 640 of 3924

INFINITI FX35 2008 Service Manual
NAVIGATION SYSTEMAV-93
< SERVICE INFORMATION >
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Wiring Diagram - NAVI -INFOID:0000000001328744
TKWM4405E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A9

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