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 subwoofer module (SUB) consists of two components:
- a loudspeaker element
- an amplifier.
The loudspeaker element is an 8 inch bass loudspeaker with two sound axes. The impedance is 4 Ξ© for each sound axis.
The amplifier has two channels, one for each sound axis. The output from each channel on the amplifier is 70 W at 4 Ξ©. Power booster amplification is set so that the acoustic output from the subwoofer module (SUB) matches the other loudspeaker channels.
When transferring sound signals to the subwoofer module (SUB), the infotainment control module (ICM) allocates a channel on the MOST network. The audio module (AUD) transmits sound signals to the subwoofer module (SUB) via the MOST network. All filtering and sound treatment of the sound signal takes place in the audio module (AUD). Volume control takes place in the Subwoofer module (SUB).
The volume of the Subwoofer module (SUB) is raised or lowered using the volume knob on the infotainment control module (ICM). The infotainment control module (ICM) transmits a request on the MOST network to the subwoofer module (SUB), which then processes the request and actively raises or lowers the volume.
The limiter function in the subwoofer module (SUB) does not permit an increase in the output level if this leads to a fall in sound quality.
The subwoofer module (SUB) is supplied with power by one of the relays in the rear electronic module (REM).
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.