Honda Accord 2008 Manual page 2631

07/11/02 10:04:15 61TA0000_230_0187
Navigation System
System Diagnostic Mode (cont'd)
F-CAN System Link
F-CAN (Fast Controller Area Network) passes
information between processors on the network. For
example, the F-CAN network is used to pass charging
system signals between the PCM and the navigation
unit for the trip computer cooling fan function. The
F-CAN network uses a communication protocol that
transmits data at 500 Kbps.
• If the diagnostic screen below reads NG with the
ignition switch ON (II), then diagnostic trouble codes
(DTCs) for the F-CAN can be retrieved with the HDS
(Honda Diagnostic System). The data displayed in the
ID boxes is for factory use only.
• For more details on troubleshooting the F-CAN, refer
to the multiplex system.
＊３２
F- CAN
UNIT
ENG
METER
Must have engine running for this test.
23-186
F- CAN System Link
Return
ERROR ACTIVE
ID ID ID ID
324
294 374 377 378
GPS Information
This screen shows the current status of GPS reception.
The circular diagram shows the current location of the
GPS satellites (yellow numbers) as they would appear
in the sky. The outer circle represents the horizon
(0 degrees elevation). The middle and inner circles
represents 30 and 60 degrees respectively. The very
center of the diagram (90 degrees elevation) is directly
overhead. Nearby obstructions, like tall buildings will
block satellites in that direction. That is why it is
necessary to be in an open area to effectively
troubleshoot GPS reception issues. The satellite
numbers shown on the diagram correspond to the PRN
number in the GPS Details screen. There are always at
least 24 active GPS satellites in orbit. Because satellites
fail, and have to be removed from service, spares are
always parked in orbit, ready to be activated. This is
why the PRN (satellite ID number) can be greater than
24.
NOTE: To use this screen for troubleshooting, the
vehicle should be outside away from buildings, tall
trees, and high-tension wires for at least 10 minutes
with the engine running.
• The Number of Satellites box shows the number of
acquired satellites (maximum of 12). It should contain
three or more icons. If not troubleshoot for GPS icon
is white or not shown (see page 23-226).
• The Current Position shows latitude, longitude, and
elevation (in feet). If there are less than four satellites,
the elevation can be grossly inaccurate.
• The Date/Time field shows the current date, and also
a time that includes daylight savings and other
offsets entered by the customer in Setup screen 2
Adjust Time Zone/Clock.
GPS Information
Number of Satellites
Current Position
Latitude N xx°xx'xx
Longitude Exxx°xx'xx
Elevation xx feet
xxxx.xx.xx xx:xx:xx
NOTE: Pressing the map guide button displays the
satellite number on each circle.
＊３３
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