The USB module is built into the audio-navigation unit. Customers can load images (which can be used as wallpaper), music, and the CDDB. Not all USB devices and devices functions work with the USB adapter. Please see the Owner's Manual for more information.

BACK button: Pressing and holding the BACK button for three seconds turns the guide lines on and off.

When the audio-navigation unit detects the BACK LT signal (when the vehicle is in R position/mode) for at least 0.5 seconds, the multi-information display unit turns on the rearview camera. The multi-information display unit delays for the 0.5 seconds to prevent changing the screen image too frequently because of incorrect shift position/mode selection.

When the rearview camera image is displayed, pressing the interface dial sends a signal from the audio-navigation unit to the rearview camera using the CAMERA BIT0 and CAMERA BIT1 signal lines to change the rearview camera view.

When the rearview image is displayed with the guide line, the guide line changes according to the steering angle input (When the steering rotates 90 degrees or more). The steering angle information is received from the gauge control module via the B-CAN as vehicle signals.

Any time the audio-navigation unit loses power (battery disconnected, audio-navigation unit disconnected, etc.) the rearview camera defaults to the normal angle view. The rearview camera will also default to this angle if you had the top down angle selected when you turned the vehicle to the OFF (LOCK) mode. If you change the rearview camera to the wide view, the rearview camera will remember this view when you turn the vehicle to the ON mode.

The GA-Net bus passes control commands throughout audio, navigation, multi-information display unit, tuner unit, XM receiver and HFL components. Because the entire bus is interconnected between components, an open or short in the GA-Net bus harness may cause any or all of these functions to become inoperative.

The yaw rate sensor (located in the audio-navigation unit) detects the direction change (angular speed) of the vehicle. The sensor is an oscillation gyro built into the audio-navigation unit.

The sensor element is shaped like a tuning fork, and it consists of the piezoelectric parts, the metal block, and the support pin. There are four piezoelectric parts: one to drive the oscillators, one to monitor and maintain the oscillation at a regular frequency, and two to detect angular velocity. The two oscillators, which have a 90-degree twist in the center, are connected at the bottom by the metal block and supported by the support pin. A detection piezoelectric part is attached to the top of each oscillator. The driving piezoelectric part is attached to the bottom of one oscillator, and the monitoring piezoelectric part is attached to the bottom of the other oscillator.

The piezoelectric parts have electric/mechanical transfer characteristics. They bend vertically when voltage is applied to both sides of the parts, and voltage is generated between both sides of the piezoelectric parts when they are bent by an external force. The oscillation gyro functions by utilizing this characteristic of the piezoelectric parts and Coriolis force. (Coriolis force deflects moving objects as a result of the earth's rotation.) In the oscillation gyro, this force moves the sensor element when angular velocity is applied.

The precision of the GPS varies according to the number of satellites from which signals are received and the view of the sky. The accuracy is indicated by the color of the GPS icon shown on the display.

The GPS antenna amplifies and transmits the signals received from the satellites to the GPS receiver.

The GPS receiver is built into the audio-navigation unit. It calculates the vehicle position by receiving the signal from the GPS antenna. The current time, vehicle position and signal reception condition is transmitted from the GPS receiver to the audio-navigation unit to adjust vehicle position and the clock in the multi-information display unit.

The audio-navigation unit calculates the vehicle position and guides you to the destination. The unit performs map matching correction, GPS correction, and distance tuning. It also controls the menu functions and the HDD, and interprets voice commands. With control of all these items, the audio-navigation unit makes the navigation picture signal, then it transmits the signal to the multi-information display unit.

The audio-navigation unit calculates the vehicle position (the driving direction and the current position) by receiving the directional change signals from the yaw rate sensor and the travel distance signals from vehicle speed pulse (VSP) of the PCM.

Map match tuning means that the vehicle's position is properly indicated on mapped roads. The map data transmitted from the HDD is checked against the current vehicle position data and the vehicle's position is indicated on the nearest road. Map matching tuning cannot be done when the vehicle is on an unmapped road, or if the vehicle is far away from a mapped road.

GPS tuning improves the accuracy of the vehicle's actual position in relation to the GPS vehicle position. The audio-navigation unit compares its calculated vehicle position with the GPS position. If there is a large difference between the two positions, the GPS tuning adjusts the calculated vehicle position to the GPS position.

The audio-navigation unit compares the vehicles calculated distance using the VSP and the vehicle's actual position based on GPS data. If the values are different, the audio-navigation unit decreases or increases the tuning value depending if the vehicle's calculated position is always ahead or behind the GPS position.

The audio-navigation unit transmits audio driving instructions before entering an intersection or passing a junction. The audio instructions come through the stereo amplifier to the front speaker.

This navigation system also has voice recognition that allows voice control of most of the navigation functions. The TALK and BACK buttons on the steering wheel activate the voice control. The voice control also allows control of the audio and the climate functions.

The audio muting logic is orchestrated by the audio-navigation unit. The audio-navigation unit determines what audio source has priority to use the speakers.

The priority of the audio sources is as follows:

HFL has the highest priority, followed by navigation, and finally the radio/CD-DVD player. The priority is passed by HFL to the audio-navigation unit by GA-Net.

The audio-navigation unit temporarily disables the voice control buttons, but allows guidance to be heard. In addition, the audio-navigation unit suppresses the output from the audio system, the tuner unit, the HandsFreeLink control unit (Bluetooth audio), or other audio accessories.

When the navigation system sends out a voice route guidance command, the driver's door speaker sound is reduced, and the navigation voice is heard in the driver's door speaker.

The climate control unit uses the sun's angle, along with the sunlight sensor to control the driver/passenger A/C air flow.

The multi-information display unit uses a liquid crystal display (LCD). The LCD is an 8 inch diagonal, thin film transistor (TFT), strip type with 384,000 pixels. The color film and LED back light are laid out on the back of the liquid crystal film.

The audio-navigation unit also includes the 5.8 inch touch screen that is used to input audio commands.

Activates the voice control system in the audio-navigation unit to accept voice commands.

Returns the display to the previous screen (similar function as the CANCEL button), or is used to end a call.

This button is used to answer incoming calls or to make outgoing calls. You can also go directly to the Cellular Phone screen by pressing this button.