Please remember to deactivate the passenger airbag if you want to use an infant car seat on the passenger seat.
The passenger airbag control is located in the glove compartment on the passenger side.
In order to switch off the function, you can use any small key. Simply turn it to the right. The deactivation is going to be displayed on the cockpit dashboard afterwards.
Do not forget to reactivate the airbag before you end your rental!