Infiniti QX56 (JA60). Manual — part 51
AV-12
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[AUDIO SYSTEM]
AUDIO SYSTEM
Component Description
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10. Rear audio remote control unit R204 11. Microphone R109
12. Front door speaker
LH D12
RH D112
13. Rear door tweeter
LH D208
RH D308
14. Rear door speaker
LH D207
RH D307
15. Back door speaker
LH D518
RH D716
16. Subwoofer B72 (under driver’s seat) 17. BOSE speaker amp M112, M113
(view behind instrument panel above
accelerator pedal)
18. Rear view camera control unit B73
(located behind luggage finisher LH)
19. Rear view camera D504
Part name
Description
AV control unit
Controls audio system, NAVI functions and satellite radio system functions
Display unit
• Touch screen controls all audio and A/C operations
• Displays all audio and climate control related information
BOSE speaker amp.
Receives power (amp ON) and audio signals from AV control unit and out-
puts audio signals to each speaker.
Steering wheel audio control switches
• Audio operation can be operated
• Steering switch signal is output to AV control unit
Front door speakers
• Outputs audio signal from BOSE speaker amp.
• Outputs high, mid and low range sounds
Front tweeters
• Outputs audio signal from BOSE speaker amp.
• Outputs high range sounds
Center speaker
• Outputs audio signal from BOSE speaker amp.
• Outputs high range sounds
Rear door speakers
• Outputs audio signal from BOSE speaker amp.
• Outputs high, mid and low range sounds
Rear door tweeters
• Outputs audio signal from BOSE speaker amp.
• Outputs high range sounds
Back door speakers
• Outputs audio signal from BOSE speaker amp.
• Outputs high, mid and low range sounds
Subwoofer
• Outputs audio signal from BOSE speaker amp.
• Outputs low range sounds
Satellite antenna
Audio signal (satellite radio) is received and output to AV control unit.
AV
NAVIGATION SYSTEM
AV-13
< FUNCTION DIAGNOSIS >
[AUDIO SYSTEM]
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NAVIGATION SYSTEM
System Diagram
INFOID:0000000005146226
System Description
INFOID:0000000005146227
NOTE:
Refer to NAVI System Owner's Manual 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 sensor), 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 data, which is stored in the hard disk drive (HDD)(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
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.
ALNIA0424GB
SEL684V
AV-14
< FUNCTION DIAGNOSIS >
[AUDIO SYSTEM]
NAVIGATION SYSTEM
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 data stored on the
HDD.
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 on the HDD.
• In map-matching, alternative routes to reach the destination will be
shown and prioritized, after the road on which the vehicle is cur-
rently 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 on the HDD, 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-matching
function may find another road and position the current-location
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 direc-
tion calculated by the distance and direction with the road data
read from the HDD is limited. Therefore, when there is an exces-
sive 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).
Type
Advantage
Disadvantage
Gyroscope (angular velocity sensor)
• Can detect the vehicle's turning angle quite
accurately.
• Direction errors may accumulate when the ve-
hicle is driven for long distances without stop-
ping.
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
SEL686V
ALNIA0839GB
SEL526V
AV
NAVIGATION SYSTEM
AV-15
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[AUDIO SYSTEM]
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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.
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