Circuit Description
How the Circuit WorksThis navigation unit 2-DIN assembly consists of the navigation unit, audio unit, and display panel. Additional components of the navigation system include the GPS Antenna, Microphone, Voice Control Switch, Stereo Amplifier, and the front speakers. Signals from the system's yaw rate sensor (inside the navigation unit) detects the vehicle turning while 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 navigation unit generates the screen graphics, and then displays them on the navigation display.
Power Supply
Fuse 23 (under-hood fuse/relay box) supplies battery voltage to the navigation unit at all times. Fuse 34 (under-dash fuse/relay box) supplies battery voltage to the navigation unit with the ignition switch in ACC (I) or ON (II).
User Controls
There are three ways to control the navigation system: (1) voice commands, (2) hard button inputs, and (3) touch screen inputs. The user presses the TALK switch on the steering wheel and speaks toward the microphone in the roof console. The navigation unit compares the microphone signal to a library of stored voice files in order to find a match. Using the voice control system mutes all of the speakers.
Most of the navigation and audio functions can be controlled with voice commands. Refer to the Navigation System Owner's Manual or to the "Voice Command Help" information screen for a list of valid voice commands.
Navigation Function
The navigation system utilizes the GPS signals obtained by the GPS antenna, the vehicle speed signal from the PCM, and the yaw rate sensor contained in the navigation unit to get a user from a starting position to a destination position. The GPS signals, the vehicle speed, and reverse signals, and the yaw rate sensor determine the position of the vehicle icon on the map. The navigation system relies on DVD maps, and points of interest (POI) to provide the user with the optimum route between the starting position and destinations.
Audio Functions
The audio section of the navigation unit consists of the AM/FM tuner, external XM tuner (USA), the CD player, PC card slot (digital media reader), amplifier and speakers. The audio features are controlled using the hard buttons surrounding the display, or from the "Audio" screen display.
XM
The GA-Net Bus controls the XM receiver.
CD Player
The single slot CD player plays CD, CD-R, MP3 or WMA formats. The audio screen displays track, artist, and album information (if available).
NOTE: Always advise customers to avoid stick-on labels for burned discs. High internal vehicle temperature can cause labels to lift and curl and jam the CD mechanism. Honda recommends writing information on the disc with a marker pen.
PC Slot
This slot (located behind the display screen) is for playing MP3 or WMA audio files. The slot accepts a standard type 2 PCMCIA adaptor with a flash memory device such as a Compact Flash, or SD Flash memory. These devices can be purchased at any computer store. The limits for music for any one card are 999 tracks (files), 99 folders, and 9 levels of directories. Only WMA and MP3 files can be played.
See the audio section for more information about troubleshooting PC card issues.
Route Guidance
When en route to a destination, the navigation system provides turn-by-turn map and voice guidance. The navigation system outputs the navigation voice guidance prompts to the front speakers. During navigation voice guidance prompts, the normal audio signal to the front speakers is muted, while the rear audio continues to play.
GPS Signal Reception
The GPS antenna obtains GPS signals obtained from the 24 or more GPS satellites in orbit. The navigation unit supplies the GPS antenna with 5 V through a coaxial cable to power the antenna's amplifier. The GPS receiver in the navigation unit receives the amplified GPS signals back through the same coaxial cable. The GPS receiver identifies the satellites and processes the different GPS signals. The navigation unit converts these signals to actual locations to determine the position of the vehicle.
NOTE: Metallic window tinting, electronic accessories such radar detectors, or cell phones and other loose items sitting on the dashboard can interfere with GPS signal reception.
GA-NET BUS
The GA-Net bus controls audio components such as the XM receiver, and other audio accessories. The GA-NET bus Information includes audio/XM channel selections, and XM station/music title names. Because the bus is shared among audio components, any open or short in the GA-Net bus harness will cause any or all of these functions to become inoperative.
Display-Clock
The navigation unit displays and updates the time on the navigation display and is accurate to the second. The time adjusts automatically for daylight savings time, and when driving across time zone borders. Disconnecting the battery resets the internal GPS clock to "0:00." The clock resets to the correct time after the system completes the GPS initialization. Clock settings can be adjusted in the navigation "Setup" menu.
Illumination
The navigation unit automatically switches the display mode between the "night", and "day" display mode using the headlights. When the headlights are on, the navigation display goes into the night display mode. If the dash brightness control setting is increased to full brightness using the "+" button, then this overrides the "night" display mode, and allows a daytime navigation display with the lights on.