Scheme 1
General Operation
Refer to the navigation system information for the navigation system operating procedures.
Anti-Theft Feature
The audio-navigation unit has an auto anti-theft protection circuit. When any of these actions occur, the unit enters its anti-theft mode
- Disconnecting the 12 volt battery.
- Disconnecting the audio-navigation unit connector A (24P) and D (20P).
- Removing the No. 1 (15 A) fuse from the under-dash fuse/relay box.
The audio-navigation unit receives vehicle information from the F-CAN bus. If there is a problem with the bus, a problem with the PCM that it is not sending the information, or is sending the wrong information (for example the PCM was substituted from another vehicle), the audio navigation unit asks for a security code.
After service, reconnect power to the audio-navigation unit, and turn the ignition switch to ON (II). There are two ways to exit the anti-theft mode
- Press and hold the VOLUME/POWER (o) knob for at least 2 seconds. The audio-navigation unit automatically exits the anti-theft mode. If the audio-navigation unit does not exit anti-theft mode, like in cases where a known-good unit (including the SD module) was substituted for testing, enter the anti-theft code.
- Enter the 5-digit anti-theft code.
If the code is lost or unavailable, you can get the code from the iN using the audio-navigation unit serial number. The serial number can easily be obtained without removing the audio-navigation unit. To get the serial number and the code, do the following
- Press and hold the MAP/GUIDE, the DEST, and the CANCEL buttons at the same time.
- At the select diagnosis items screen, select Detail Information & Setting, select Unit Check, then Navi ECU. The system runs a brief diagnosis, then the audio-navigation unit serial number is displayed.
- Use the anti-theft code inquiry option on the iN to look up the 5-digit anti-theft code. The iN may display more than one code for a given serial number. This is because serial numbers are not unique. You may have to try more than one 5-digit code. If no code is shown, or if the code(s) given do not work in the audio-navigation unit, contact the Automobile Warranty department.
The SD module and audio-navigation unit are mated to each other and can only be mated to a new unit. If someone tried to put a stolen SD module in another audio-navigation unit, or insert their SD module in a stolen audio-navigation unit, the two components cannot mate and a SD module read error appears on the display.
When replacing the audio-navigation unit, be sure to give the customer the new anti-theft security code.
Overview
The navigation system is a highly sophisticated, hybrid locating system.
The audio-navigation unit uses global positioning system (GPS) satellite signals, internal yaw and vehicle speed inputs, and a map database to show where the vehicle is and to help guide you to a desired destination.
The audio-navigation unit's GPS receiver receives signals from the GPS, a network of 24 satellites in orbit around the earth. By receiving signals from several of these satellites, the navigation system can determine the latitude, longitude, and elevation of the vehicle. In addition, signals from the system's yaw rate sensor and the PCM (vehicle speed pulse) enable the system to keep track of the vehicle's direction and speed of travel.
Signals from the system's yaw rate sensor (inside the audio-navigation unit) detects turns, and the PCM vehicle speed pulse (VSP) and reverse signal enable the system to keep track of the vehicle's speed and direction of travel. The advantage of this hybrid system is that the system can track your position if either the GPS signal or the vehicle speed pulse is missing. For instance, when in a tunnel (no GPS), the speed signal is used to update your position on the map. Alternately, while the vehicle is being transported on a ferry, GPS signals can show the vehicle position on the map as it crosses the water.
The navigation system uses the location, direction, and speed information to display the appropriate map and calculate a route to the destination entered. As you drive to a destination, the system provides both visual and audio guidance. Audio guidance is sent to the audio unit, and an RGB graphics color signal is sent to the navigation display.
This navigation system also has voice recognition that allows voice control of most of the navigation, and audio functions. The voice control switches (navigation TALK and BACK buttons on the steering wheel) activate the voice control system. The microphone on the ceiling receives your voice commands. For more information on this feature, consult the navigation owner's guide.
The illumination signal is used by the audio-navigation unit to automatically switch the display mode between the Night and Day display modes. When the headlights are on, and the dash brightness control setting is set to full bright, it overrides the Night display mode, and allows a daytime navigation display with the lights on.
When the navigation system is giving voice guidance commands, the front speakers are muted. When the voice control system is being used (navigation TALK button pressed), all of the speakers are muted.
The internal GA-Net II bus passes information back and forth between the audio-navigation unit, the HandsFreeLink control unit, and the audio system components. The information passed on this bus are touch button commands, audio muting signal, audio (radio and USB audio), and any opens or shorts in these bus lines can affect the navigation system or other audio accessory operation.
The clock on the navigation display is set and maintained internally by the audio-navigation unit. The time is automatically adjusted for daylight savings, and time zone changes while driving. The time and daylight savings time can be adjusted in setup.
Additional information is available about the navigation components following the System Diagram. A glossary of terms that are used throughout this article follows the detailed information.
The Navigation System Manual in the glove box or on-line at any official Honda service website covers all of the system functions and settings. Use this as a resource when evaluating a customer concern.
