2005 INFINITI FX35 Service Manual

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Page 681 of 4731

INFINITI FX35 2005 Service Manual AV-82
INTEGRATED DISPLAY SYSTEM
Revision: 2005 July 2005 FX
Ignition Signal InspectionAKS005UG
1. CHECK IGNITION SIGNAL
1. Turn ignition switch ON.
2. Check voltage between display unit harness con

Page 682 of 4731

INFINITI FX35 2005 Service Manual INTEGRATED DISPLAY SYSTEM AV-83
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3. CHECK AUDIO COMMUNICATION SIGNAL(AUD–DSP)
1. Turn ignition switch OFF and connect audio unit c

Page 683 of 4731

INFINITI FX35 2005 Service Manual AV-84
INTEGRATED DISPLAY SYSTEM
Revision: 2005 July 2005 FX
AV Communication Line InspectionAKS005UI
1. CHECK A/C AND AV SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect display unit connec

Page 684 of 4731

INFINITI FX35 2005 Service Manual INTEGRATED DISPLAY SYSTEM AV-85
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CAN Communication Line InspectionAKS005UJ
1. CHECK MONITOR DESCRIPTION
1. Start display unit self-d

Page 685 of 4731

INFINITI FX35 2005 Service Manual AV-86
INTEGRATED DISPLAY SYSTEM
Revision: 2005 July 2005 FX
Audio Steering Wheel Switch InspectionAKS005UK
Refer to AV- 4 2 , "Audio Steering Wheel Switch Inspection" .
Removal and Installation of Di

Page 686 of 4731

INFINITI FX35 2005 Service Manual NAVIGATION SYSTEM AV-87
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NAVIGATION SYSTEMPFP:25915
System DescriptionAKS007IQ
The navigation system periodically calculates the vehi

NAVIGATION SYSTEM AV-87
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NAVIGATION SYSTEMPFP:25915
System DescriptionAKS007IQ
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.
CAUTION:
The road map data is based on data stored in the map DVD-
ROM.
SKIA6215E
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 687 of 4731

INFINITI FX35 2005 Service Manual AV-88
NAVIGATION SYSTEM
Revision: 2005 July 2005 FX
In map-matching, alternative routes to reach the destination will
be shown and prioritized, after the road on which the vehicle is
currently drive

AV-88
NAVIGATION SYSTEM
Revision: 2005 July 2005 FX
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 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.
SEL686V
SKIA0613E
SEL526V

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INFINITI FX35 2005 Service Manual NAVIGATION SYSTEM AV-89
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Revision: 2005 July 2005 FX
COMPONENT DESCRIPTION
NAVI Control Unit
The gyro (angular speed sensor) and the DVD-ROM drive are
built-

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