Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Functions In The Audio Control Module (AUD)
Different versions of Audio Control Module (AUD) have a different number of functions.
- Adjustable volume.
Raises or lowers volume.
- Adjustable bass.
Raises or lowers bass sound.
- Adjustable treble.
Raises or lowers treble sound.
- Limiter.
The Limiter function used in the control module does not permit increase of the output if this results in reduced sound quality. In vehicles with double batteries the function limits the output when the engine is autostopped.
- Mixing.
Mixing allows numerous different sound types to be mixed. In this case, the different sound types are foreground noise background noise. An example of this is where a CD is playing (background noise) and the reverse warning is activated (foreground noise). The reverse warning will be heard in the loudspeakers while the volume of the music drops at the same time
- Bass compensation.
The bass from the control module is compensated/modified depending on the volume and the speed of the car. If the vehicle's speed and volume change, the bass compensation also changes.
- Treble compensation.
The treble in the control module is compensated/modified depending on how the volume is changed. If the volume changes, the treble compensation also changes.
- Equalizer setting, sound compensation.
Different audio settings can be made from the Audio Control Module (AUD). This compensates for factors such as the location of the speakers and the layout of the vehicle interior.
- Dolby ProLogic II.
Surround decoder for playback of sound.
- Dolby digital.
Surround decoder for playback of multi-channel sound.
- Adjustable surround level.
Setting of volume for the different surround channels.
- Soundstage.
Optimizing of sound for driver, front and rear seat.
- Echofilter.
Prevents echoes in the handsfree speaker.
- Center channel volume.
Raises or lowers the center channel volume.
- Subwoofer volume.
Setting sound volume of subwoofer speakers.
There are two types of sound, foreground sound and background sound. The sounds which are foreground and background are listed below.
Foreground audio:
- Navigation
- traffic messages
- Parking assistance
Background audio:
- analog radio, AM/FM
- CD player
- DVD player
- USB
- AUX-input (3.5 mm)
- Media player, Bluetooth
- Active Noise Control (ANC) (only S60 (11-), V60 and XC60 T6 4-cyl)
The functions in the different versions of the Audio Control Module (AUD) are:
High Performance and High Performance Multimedia
- Adjustable volume
- Adjustable bass level
- Adjustable treble level
- Limiter.
- Mixing
- Bass compensation
- Treble compensation
- Equalizer
Premium Sound Multimedia
- Adjustable volume
- Adjustable bass level
- Adjustable treble level
- Limiter
- Mixing
- Bass compensation
- Treble compensation
- Equalizer
- Dolby ProLogic II
- Dolby digital
- Adjustable surround level
- Soundstage
- Echofilter
- Center channel volume
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.