Scheme 16
Scheme 17
Scheme 18
Overview
The audio unit acts as the processor for all audio functions. You can select the audio functions from the audio panel, the audio remote (on steering wheel), or by using the navigation voice control system. The front climate control unit display provides the current front and rear audio status. For vehicles with navigation, additional audio information is available by touching the audio button. (See the Owner's manual for more details.)
Each audio component passes its audio or audio signal to the audio unit. In addition, it communicates with the audio unit via the GA-Net bus. Any open connection in this circuit will cause audio and navigation functions to appear inoperative.
The audio unit has a built-in EEPROM (electrically erasable programmable read-only memory). This memory holds the audio presets data (AM/FM radio frequency, sound settings, etc.) even when the battery is disconnected.
With the ELS and the premium sound system, a stereo amplifier unit powers the speakers. The 6 CD changer output can be directed to the audio system.
The XM can be output to either the front or the RES (rear entertainment system). However, if the XM is playing in the front, the CD changer and Bluetooth audio cannot be used for the RES. The RES (built into the audio-navigation unit) can be used to play a CD in the rear.
A security signal is daisy-chained between the audio, RES and navigation components for integration into the vehicle's alarm system.
Speed-Sensitive volume compensation (SVC)
All audio systems are equipped with speed-sensitive volume compensation (SVC). The audio-navigation unit or audio unit receives the vehicle speed pulse (VSP) from B-CAN. The system processes the speed input and increases the navigation or audio system volume level as the vehicle speed increases to compensate for the interior noise that occurs at higher speeds. When the vehicle slows down, the volume returns to its normal level. The SVC has four settings: SVC OFF, LOW, MID, and HIGH that can be adjusted using the audio-navigation unit or audio unit. The factory default setting is MID.
To change the audio unit SVC setting, press the tune folder sound knob repeatedly until the SVC is displayed, then rotate the knob to adjust the SVC to the desired setting (SVC OFF, LOW, MID, or HIGH).
To change the audio-navigation unit SVC setting, press the AUDIO button, and then select the Sound Setup from the AUDIO MENU on the navigation display. Rotate the interface dial to select the desired setting (SVC OFF, LOW, MID, or HIGH).