XC90 AWD V8-4.4L VIN 85 B8444S (2005)
All versions of the audio module (AUD) have a microphone which is directly connected to the control module. The microphone is installed in the rear
The microphone is used for functions such as handsfree in the phone module (PHM).
Playing back sound
All functions in the audio module (AUD) (16/105) are controlled by the signals from other nodes in the MOST network.
To play back sound, a control module transmits a request to the infotainment module (ICM) (16/1). The infotainment control module (ICM) distributes
the request to the audio module (AUD). The control module is then able to transmit signals via the MOST network to the audio module (AUD).
The infotainment control module (ICM) (16/1) processes changes to the sound, balance, bass, treble and equalizer settings. It transmits the changes via
the MOST network to the audio module (AUD) (16/105) which then carries out the changes.
The control modules on the MOST network which use the audio module (AUD) to play back sound are:
the antenna module (ATM) (16/110) for AM/FM radio
the antenna module (ATM) (16/110) for digital radio, DAB
the phone module (PHM) (16/60) for handsfree calls
multimedia module (MMM) (16/108) for voice guiding (navigation)