Airbag and Emergency Tensioning Retractor wiring diagram legend for 451 chassis, showing sensor and control unit designations.

Wiring diagram legend table with electrical component codes and coordinates for Smart 451 airbag system.

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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.