Nissan Frontier. Manual — part 65
AV-252
< SYSTEM DESCRIPTION >
[NAVIGATION]
SYSTEM
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 detected because priorities 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 map
SD-card.
NOTE:
The road map data is based on data stored in the map SD-card.
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 this case, the vehicle mark on the display must be cor-
rected manually.
• 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 vehicle mark has been repo-
sitioned.
Alternative routes will be shown in different order of priority, and
the incorrect road can be avoided if there is an error in distance
and/or direction.
Routes are of the same priority if two roads are running in parallel.
Therefore, the vehicle mark may appear on either of them alter-
nately, depending on maneuvering of the steering wheel and con-
figuration of the road.
SEL684V
Type
Advantage
Disadvantage
Gyroscope
(angular velocity sensor)
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
SEL686V
AV
SYSTEM
AV-253
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• Map-matching does not function correctly when a road on which
the vehicle is driving is new and not recorded in the map SD-card,
or when road pattern stored in the map data and the actual road
pattern are different due to repair.
The map-matching function may find another road and position the
vehicle mark on it when driving on a road not present in the map.
Then, the vehicle mark may change to it when the correct road is
detected.
• Effective range for comparing the vehicle position and travel direc-
tion calculated by the distance and direction with the road data
read from the map SD-card is limited. Therefore, correction by
map-matching is not possible when there is an excessive gap
between current vehicle position and the position on the map.
GPS (Global Positioning System)
GPS (Global Positioning System) is developed for and is controlled
by the US Department of Defense. The system utilizes GPS satel-
lites (NAVSTAR), transmitting out radio waves while flying on an orbit
around the earth at an altitude of approximately 21,000 km (13,049
mile).
The receiver calculates the travel position in three dimensions (lati-
tude/longitude/altitude) according to the time lag of the radio waves
that four or more GPS satellites transmit (three-dimensional position-
ing). The GPS receiver calculates the travel position in two dimen-
sions (latitude/longitude) with the previous altitude data if the GPS
receiver receives only three radio waves (two-dimensional position-
ing). GPS position correction is not performed while stopping the
vehicle.
Accuracy of the GPS will deteriorate under the following conditions:
• In two-dimensional positioning, GPS accuracy will deteriorate when altitude of the vehicle position changes.
• The position of GPS satellite affects GPS detection precision. The position detection may not be precisely
performed.
• The position detection is not performed if GPS receiver does not receive radio waves from GPS satellites.
(Inside a tunnel, parking in a building, under an elevated highway etc.) GPS receiver may not receive radio
waves from GPS satellites if any object is placed on the GPS antenna.
NOTE:
• The detection result has an error of approximately 10 m (32.81 ft) even with a high-precision three dimen-
sional positioning.
• There may be cases when the accuracy is lowered and radio waves are stopped intentionally because the
GPS satellite signal is controlled by the US trace control center.
SATELLITE RADIO FUNCTION
• Satellite radio function is built into AV control unit.
• Sound signal (satellite radio) is received by satellite antenna and transmitted to AV control unit. AV control
unit then sends audio signals to the audio amplifier. The audio amplifier amplifies the audio signals before
sending them to the speakers, tweeters and subwoofer.
AUXILIARY INPUT FUNCTION
• Sound can be output from an external device by connecting a device to the AUX jack.
• AUX sound signals are transmitted to each speaker via AV control unit.
REAR VIEW MONITOR FUNCTION
Camera Image Operation Principle
• The ITS control unit supplies power to the rear view camera when receiving a reverse signal.
• The rear view camera transmits camera images to the ITS control unit when power is supplied from the ITS
control unit.
• The ITS control unit transmits camera images to the AV control unit.
• The AV control unit combines a warning message and fixed guide lines with an image received from the ITS
control unit to display a rear view camera image on the screen.
USB CONNECTION FUNCTION
SKIA0613E
SEL526V
AV-254
< SYSTEM DESCRIPTION >
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SYSTEM
• iPod
®
or music files in USB memory can be played.
• Sound signals are transmitted from USB connector and AUX jack to the AV control unit and output to each
speaker and tweeter.
• iPod
®
is recharged when connected to USB connector and AUX jack.
NOTE:
Use the enclosed USB harness when connecting iPod
®
to USB connector and AUX jack.
iPod
®
is a trademark of Apple inc., registered in the U.S. and other countries.
SPEED SENSITIVE VOLUME SYSTEM
• Volume level of this system goes up and down automatically in proportion to the vehicle speed.
• The control level can be selected by the customer.
HANDS-FREE PHONE SYSTEM
• Bluetooth
®
control is built into AV control unit.
• The connection between cellular phone and AV control unit is performed with Bluetooth
®
communication.
• The voice guidance signal is input from the AV control unit and output to the front speakers when operating
the cellular phone.
When A Call Is Originated
• Spoken voice sound output from the microphone (microphone signal) is input to AV control unit.
• AV control unit outputs to cellular phone with Bluetooth
®
communication as a TEL voice signal.
• Voice sound is then heard at the other party.
When Receiving A Call
• Voice sound is input to own cellular phone from the other party.
• TEL voice signal is input to AV control unit by establishing Bluetooth
®
communication from cellular phone,
and the signal is output to the audio amplifier. The audio amplifier amplifies the audio signals before sending
them to the speakers.
AV
DIAGNOSIS SYSTEM (AV CONTROL UNIT)
AV-255
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DIAGNOSIS SYSTEM (AV CONTROL UNIT)
Description
INFOID:0000000009482191
The AV control unit on board diagnosis performs the functions listed in the table below:
Perform CONSULT diagnosis if the AV control unit on board diagnosis does not start or the screen does not
display anything.
On Board Diagnosis Function
INFOID:0000000009482192
METHOD OF STARTING
1. Turn the ignition ON.
2. Turn the audio system OFF.
Mode
Item
Content
Version
—
Version data of the AV control unit is dis-
played.
User Configuration
Touch Display Calibration
—
Allows correction of the position detec-
tion accuracy of the touch panel.
Radio
FM monitor
—
Monitors the dynamic values of the cur-
rent tuner
AM monitor
—
XM monitor
—
Version data is displayed.
XM functions
• Clear XM Chipset NVM
• Reset All XM Settings
• Clear IGS
• XM CBM Debug Mode
• External Diag Mode
Current status is displayed.
System State
Running System Status
• SD card slot Access
• Power Supply
• Speed Signal
• Direction Signal
• Illumination Signal
• GPS Antenna
• GPS Tracking
• Satellites Visible
• Satellites Tracked
• Microphone Current
• Steering wheel key
• Radio Antenna
• USB Device
• iPod
®
firmware version
• BT Status
The current system status is displayed.
Speaker Test 4kHz
—
This activates a sequence of test tone
outputs to the audio circuits one after the
other for 1 second.
Speaker Test 100Hz
Display-Test
—
This provides a test sequence where
test displays (plain colored display: e.g.
white, black, red, blue, green) are shown
one after the other.
The respective color is shown for an in-
dicated period of time (parameter). After
the display test, the design of the display
previously available is stored. While the
screen shows a plain colored display, a
pixel malfunction may be detected.
Self Test
• SD Card Access
• BT Module Access
• Radio Antenna
• GPS Antenna
• XM Antenna
A system self test is executed and the
results are stored into the error memory.
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