smart Audio-System controls and operation manual page 110 explaining radio waveband selection, external audio input, volume control, and USB/Bluetooth connectivity features.

Audio system control interface diagram with numbered callouts and operating instructions for radio and external device connectivity.

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See all Electrical figures for the Fortwo / Forfour (453), or browse the full figure library. Part numbers and callouts are community-sourced and cross-referenced against the manuals — confirm with your VIN before ordering.