2010 Toyota Tundra CrewMax Owners Manual - Page 162

1-7. Safety information Passenger airbag off switch (Regular Cab models) The passenger airbag off switch is designed to disable the front passenger airbag in order to allow usage, if necessary, of the right passenger seat by a member of a passenger risk group identified in TABLE 1 (→P. 133). AUTO position This position makes the front passenger airbag system operational. At this time, the indicator light condition varies depending on the size of the occupant in the right passenger seat. OFF position The front passenger airbag is disabled. At this time, the AIR BAG OFF indicator light will come on.