Stop lamp actuation function chart showing brake light switch, SAM control unit, and stop lamp circuit connections for smart 451/453 models.

Schematic diagram of stop lamp actuation system with brake switch, SAM module, and three stop lamps.

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See all Chassis 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.