Honda ACCORD HYBRID 2005 Service Manual page 2045

G e n e r a l T r o u b l e s h o o t i n g I n f o r m a t i o n
General Operation
Refer to the Navigation System owner's manual for the
navigation system operating procedures.
Anti-theft Feature
The navigation system and audio unit have a coded
theft protection circuit. Be sure to get the customer's
anti-theft security codes number before:
• Disconnecting the battery.
• Disconnecting the navigation unit 8P connector.
• Removing the No. 7 (10 A) fuse f r o m the under-dash
fuse/relay box.
After service, reconnect power to the navigation unit,
and turn the ignition switch ON (II). Enter the 4-digit
anti-theft security code, then select " D o n e " .
If the code cannot be f o u n d , use the interactive Network
(/N) to look it up. Y o u will need the serial number f r o m
the navigation unit in the trunk. It is on a label on the
underside of the unit. Alternatively, y o u can v i e w the
serial number in the Navi ECU diagnostic screen
(see page 23-113).
W h e n replacing the navigation unit, be sure to give the
customer the new anti-theft security code.
Symptom Diagnosis
Certain circumstances and system limitations w i l l result
in occasional vehicle positioning errors. Some
customers may think this indicates a problem w i t h the
navigation system w h e n , in fact, the system is normal.
Keep the f o l l o w i n g items in m i n d w h e n interviewing
customers about s y m p t o m s of the navigation system.
Self-lnertial Navigation Limitations
The limitations of the self-inertial portion of the
navigation system (the y a w rate sensor and the vehicle
speed signal) can cause some discrepancies between
the vehicle's actual position and the indicated vehicle
position (GPS vehicle position).
The f o l l o w i n g circumstances may cause vehicle
positioning errors:
• M o v i n g the vehicle w i t h the engine stopped and the
vehicle stopped, such as by ferry or t o w truck, or if
the vehicle is spun on a turn table.
• Tire slippage, changes in tire rolling diameters, and
some driving situations may cause discrepancies in
travel distances. Examples of this include:
- Continuous tire slippage on a slippery surface
- Driving w i t h snow chains m o u n t e d
- A b n o r m a l tire pressure
- Incorrect tire size
- Frequent lane changes across a w i d e highway
- Continuous driving on a straight or gently curving
highway
- Very b u m p y roads
• Tolerances in the system and m a p inaccuracies
sometimes limit h o w precisely the vehicle position is
indicated. Examples of this include:
- Driving on roads not s h o w n on the m a p (map
matching is not possible)
- Driving on a road that w i n d s in one direction, such
as a loop bridge, an interchange, or a spiral parking
garage
- Driving on a road w i t h a series of sharp hair-pin
turns
- Driving near a gradual highway exit or transition
- Driving on one of t w o close parallel roads
- Making many 90 degree turns
Global Positioning System (GPS) Limitations
The GPS cannot detect the vehicle's position during the
f o l l o w i n g instances:
• For the first 5 to 10 minutes after reconnecting the
battery (This can take as long as 45 minutes).
• W h e n the satellite signals are blocked by tall
buildings, mountains, tunnels, large trees, inside
parking structures, or large trucks.
• W h e n the GPS antenna is blocked by metallic
w i n d o w tinting or by an object placed above it in the
vehicle. The GPS antenna requires a clear
unobstructed v i e w of the sky.
• W h e n there is no satellite signal output (Signal output
is sometimes stopped for satellite servicing).
• W h e n the satellite signals are blocked by the
operation of some electronic aftermarket accessories
including, but not limited to non-OEM in-dash
entertainment units (radio, CD players/changers,
radar detectors, and theft recovery systems), and
cellphones placed near the navigation system.
(cont'd)
23-79