radio antenna NISSAN PATROL 2004 Electronic Repair Manual

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 ¯ying 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-di-
mensional 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 calculated previously by using radio waves from four or more
GPS satellites (two-dimensional positioning).
Accuracy of the GPS will deteriorate under the following conditions.
+In two-dimensional positioning, the GPS accuracy will deterio-
rate when the altitude of the vehicle position changes.
+ There may be an error of approximately 10 m (30 ft.) in posi-
tion 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 sat-
ellites 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.
COMPONENT DESCRIPTION
NAVI control unit
+The gyro (angular speed sensor) and the DVD-ROM drive are
built-in units that control the navigation functions.
+ Signals are received from the gyro, the vehicle speed sensor,
and the GPS antenna. Vehicle location is determined by com-
bining this data with the data contained in the DVD-ROM map.
Locational information is shown on liquid crystal display panel.
DVD-ROM drive
Maps, traffic control regulations, and other pertinent information
can be easily read from the DVD-ROM disc.
Map DVD-ROM
+The map DVD-ROM has maps, traffic control regulations, and
other pertinent information.
+ To improve DVD-ROM map matching and route determination
functions, the DVD-ROM uses an exclusive Nissan format.
Therefore, the use of a DVD-ROM provided by other manufac-
turers cannot be used.
SEL526V
PKIA0248E
PKIA0249E
NAVIGATION SYSTEM
System Description (Cont'd)
EL-4164

DIAGNOSIS BY HISTORY OF ERRORS
The ªSelf-diagnosisº results indicate whether an error occurred during the period from when the ignition switch
is turned to ON until ªSelf-diagnosisº is completed.
If an error occurred before the ignition switch was turned to ON and does not occur again until the ªSelf-di-
agnosisº is completed, the diagnosis result will be judged normal. Therefore, those errors in the past, which
cannot be found by the ªSelf-diagnosisº, must be found by diagnosing the ªHistory of Errorsº.
The History of Errors displays the time and place of the most recent occurrence of that error. However, take
note of the following points.
+Correct time of the error occurrence may not be displayed when the GPS antenna substrate within the
NAVI control unit has malfunctioned.
+ Place of the error occurrence is represented by the position of the current location mark at the time when
the error occurred. If the current location mark has deviated from the correct position, then the place of
the error occurrence may be located correctly.
+ The maximum number of occurrences which can be stored is 50. For the 51st and later occurrences, the
displayed number remains 50.
When a reproducible malfunction occurred but its cause cannot be identi®ed because several errors are
present, record the item, number and place (longitude/latitude) of error occurrence (or delete the History of
Errors), then turn the ignition switch from OFF to ON to reproduce the malfunction. Check the History of Errors
to ®nd the items which show an increased number of occurrences, and diagnose the item.
Error item Possible causes
Example of symptom
Action/symptom
Gyro sensor
disconnected Communications malfunction between NAVI control unit
and internal gyro
+Navigation location detection performance has dete-
riorated. (Angular velocity cannot be detected.)
+
Perform self-diagnosis.
+ When the NAVI control unit is judged normal by self-
diagnosis, the symptom may be intermittent, caused
by strong radio interference.
GPS discon-
nected Communication error between NAVI control unit and
internal GPS substrate
+Navigation location detection performance has dete-
riorated. (Location correction using GPS is not per-
formed.)
+ GPS receiving status remains gray.
+
Perform self-diagnosis.
+ When the NAVI control unit is judged normal by self-
diagnosis, the symptom may be intermittent, caused
by strong radio interference.
GPS transmis-
sion cable
malfunction Malfunctioning transmission wires to NAVI control unit
and internal GPS substrate
+During self-diagnosis, GPS diagnosis is not per-
formed.
+
Perform self-diagnosis.
+ When the NAVI control unit is judged normal by self-
diagnosis, the symptom may be intermittent, caused
by strong radio interference.
GPS input line
connection
error Malfunctioning receiving wires to NAVI control unit and
internal GPS substrate
+Navigation location detection performance has dete-
riorated. (Location correction using GPS is not per-
formed.)
+ GPS receiving status remains gray.
+
Perform self-diagnosis.
+ When the NAVI control unit is judged normal by self-
diagnosis, the symptom may be intermittent, caused
by strong radio interference.
GPS TCX0
over
GPS TCX0
under Oscillating frequency of the GPS substrate frequency
synchronizing oscillation circuit exceeded (or below) the
speci®cation
+Navigation location detection performance has dete-
riorated. (Location correction using GPS is not per-
formed.)
+ GPS receiving status remains gray.
+
Perform self-diagnosis.
+ When the NAVI control unit is judged normal by self-
diagnosis, the symptom may be intermittent, caused
by strong radio interference, or the control unit may
have been subjected to excessively high or low tem-
peratures.
NAVIGATION SYSTEM
Con®rmation/Adjustment Mode (Cont'd)
EL-4196

Error itemPossible causes
Example of symptom
Action/symptom
GPS ROM
malfunction
GPS RAM
malfunction Contents of ROM (or RAM) in GPS substrate are mal-
functioning.
+
Location detection accuracy of the navigation system
will deteriorate, depending on the malfunctioning area
in the memory, because GPS cannot make correct
positioning. (Location correction using GPS is not per-
formed.)
+
Perform self-diagnosis.
+ When the NAVI control unit is judged normal by self-
diagnosis, the symptom may be intermittent, caused
by strong radio interference.
GPS RTC
malfunction Clock IC in GPS substrate is malfunctioning.
+
Correct time may not be displayed.
+ After the power is turned on, the system always takes
some time until GPS positioning becomes possible.
(The GPS receiver starts positioning without re-col-
lecting the whole satellite information when it judged
the data stored in the receiver is correct.)
+ Correct time of error occurrence may not be stored in
the ªHistory of Errorsº.
+
Perform self-diagnosis.
+ When the NAVI control unit is judged normal by self-
diagnosis, the symptom may be intermittent, caused
by strong radio interference.
GPS antenna
disconnected Malfunctioning connection between GPS substrate in
NAVI control unit and GPS antenna.
+Navigation location detection performance has dete-
riorated. (Location correction using GPS is not per-
formed.)
+ GPS receiving status remains gray.
+
Perform self-diagnosis.
+ When connection between NAVI control unit and
GPS antenna is judged normal by self-diagnosis, the
symptom may be intermittent, caused by impact or
vibration.
Low voltage of
GPS The power voltage supplied to the GPS circuit board has
decreased.
+Navigation location detection performance has dete-
riorated. (Location correction using GPS is not per-
formed.)
+ GPS receiving status remains gray.
+
Perform self-diagnosis.
+ When connection between NAVI control unit and
GPS antenna is judged normal by self-diagnosis, the
symptom may be intermittent, caused by impact or
vibration.
DVD-ROM
Malfunction
DVD-ROM
Read error
DVD-ROM
Response
Error Malfunctioning NAVI control unit Ð
Dedicated map DVD-ROM is in the system, but the data
cannot be read.
+The map of a particular location cannot be displayed.
+ Speci®c guidance information cannot be displayed.
+ Map display is slow.
+ Guidance information display is slow.
+ System has been affected by vibration.
+
Is map DVD-ROM damaged, warped, or dirty?
Ð If damaged or warped, the map DVD-ROM is mal- functioning.
Ð If dirty, wipe the DVD-ROM clean with a soft cloth.
+ Perform self-diagnosis.
+ When NAVI control unit is judged normal by self-
diagnosis, the symptom is judged intermittent, caused
by vibration.
NAVIGATION SYSTEM
Con®rmation/Adjustment Mode (Cont'd)
EL-4197