The smart fortwo features highly efficient restraint systems that meet Mercedes-Benz's passive safety standards. Infant or children restraint systems (booster, infant or child seat) can be affixed properly to the passenger seat by means of the safety belt. A ratchet mechanism locates the tightly pulled safety belt and holds the infant/child restraint system in position. Please note that laws relating to the use and installation of infant or children restraint systems vary by jurisdiction. You will need to review the laws applicable to you prior to installing and using infant or children restraint systems in your smart fortwo.
An electronically controlled system will detect the weight of the occupant on the passenger seat or the installation of a child restraint system. The Electronic Control Unit (ECU) determines the appropriate mode of the dual stage full size front airbag deployment. For very young passengers for whom an airbag deployment could mean a serious risk, the front and side airbags will be deactivated. A control lamp in the center of the roof panel will show this clearly. Always check the control lamp to make sure the airbags are deactivated for very young passengers.