Audio Unit: Notes
The audio unit acts as a processor which includes playback functions of the USB, Bluetooth audio, iPod for music, and an internal radio tuner or an external radio tuner that is controlled with digital communication. Select audio functions from touch screen (touch the display directly to select items on the screen) or the audio remote switch (on the steering wheel).
The audio unit exists as a Head Unit that controls external audio/visual system. The center display unit acts as a user interface and is located on the front of audio unit. An antenna for Bluetooth communication, and an antenna for wireless LAN communication are built into the audio unit. Each function about the system is installed in the audio unit as applications. As an advanced feature, a smartphone linkage and video playback functions are available.
An audio unit with navigation function is referred to as an audio-navigation unit. This unit has a built-in gyro sensor and a navigation map data (refer to the Navigation System Overview).
The SD card is a storage media that saves the navigation map data. The audio-navigation unit and the SD card cannot be substituted separately because the SD card module is not a removable type.
Both the audio-navigation unit and the audio unit have a GPS antenna circuit. The GPS information is used for a function that needs vehicle location other than the navigation function.
For vehicles with Sirius XM (R) radio, the XM receiver circuit is built into the audio unit circuit. The XM satellite/terrestrial signal is received by the dedicated XM antenna. The audio unit holds XM presets and settings even when the 12 volt battery is disconnected (AM/FM presets are stored in the tuner unit).