Panic alarm function chart showing transmitter key, SAM control unit, horn, and signal lights on Smart fortwo (450/451/452/454).

Schematic diagram of panic alarm system components and their connections on a Smart car.

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See all Electrical figures for the Fortwo (450), 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.