Toyota Yaris Owner's Manual page 51

WARNING

When installing a child restraint system
For safety reasons, always install a child restraint system in a rear seat. In
the event that the rear seat cannot be used, the front seat be used as long
as the airbag manual on-off system is set to "OFF".
If the airbag manual on-off system is left "ON", the strong impact of the air-
bag deployment (inflation) may cause serious injury or even death.

When a child restraint system is not installed on the front passenger
seat
Ensure that the airbag manual on-off system is set to "ON".
If it is left "OFF", the airbag may not deploy in the event of an accident,
which may result in serious injury or even death.
1-1. For safe use
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