Volvo Workshop Manuals
XC90 AWD L6-3.2L VIN 98 B6324S (2007)
Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Communications Control Module > Component Information > Description and Operation > Audio Module (AUD) > Page 140
The audio module (AUD) is an amplifier which is connected to the MOST network. It has the following functions:
to carry the sound signal transmitted on the MOST network out to the directly connected loudspeakers and to the headsets as analogue signals
to carry voice messages from the microphone, out on the MOST network.
to transmit requests from the headset panel to change to the next or the previous track or to change the sound source.
If there is a subwoofer module (SUB) installed on the MOST network, the audio module (AUD) can process the incoming signal and transmit it to the
High Performance HP, Headset panel
Premium Sound HP, Headset panel
Audio module (AUD) High Performance and High Performance HP have 4x40 W output and Premium Sound HP has 5x130 W.
Functions in the audio module (AUD)
The audio module (AUD) can run a number of different functions, but these functions can also be activated by other nodes. An example of these
1. Adjustable volume, raises and lowers the volume
signals for the park assistance function.
5. Limiter, the limiter function in the control module does not permit an increase in the power output level if this leads to a fall in sound quality
and system generated sound signals. An example of this is where a CD is playing (background noise) and the carphone rings (foreground noise).
7. Digital bass loudspeaker output, via MOST network, transmits signals to Subwoofer module (SUB). No foreground noise must be included in
8. Bass compensation, the bass from the control module is compensated or modified depending on the volume level and the speed of the car. If the
vehicle speed and volume level changes, the bass compensation is also changed
9. Treble compensation, the treble in the control module is compensated or modified depending on how the volume is changed. If the volume
changes, the treble compensation also changes
10. Equalizer setting, sound compensation, there are different settings for the sound from the audio module (AUD). This compensates for factors
such as the location of the loudspeakers and the layout of the car interior.
11. Dolby ProLogic II, a surround decoder for playing sound.
There are two types of sound, foreground sound and background sound. The sounds which are foreground and background are listed below.
system generated sound from the audio module (AUD) (different types of alarm sound)
analogue radio, AM/FM
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