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.
Control Module
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
- to carry voice messages from the microphone, which is directly connected to the audio module (AUD), to the MOST network.
If a subwoofer module (SUB) is installed on the MOST network, the audio module (AUD) can process the incoming signal and transmit it to the subwoofer module (SUB).
There are three versions of the audio module (AUD):
- Performance (included after structure week 2004w46 in the Integrated Audio Module (IAM)). Has an output of 25W per audio channel. The control module has 4 audio channels, these produce a combined output of 100W.
- High Performance . Has an output of 40 W per channel. The control module has 4 channels, giving a total output of 160W
- Premium Sound (C70) . Has an output of 130 W per channel. The control module has 5 channels, giving a total output of 650W.
Each version of the audio module (AUD) has a different number of loudspeakers and different loudspeaker models.
All versions of the audio module (AUD) have a microphone input. This is used by the phone module (PHM) for phone calls (handsfree) for example.
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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.
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