TOYOTA 2011 Tundra - Manual (Page 166)

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1-7. Safety information
1
Before driving
CAUTION
n Front passenger occupant classification system precautions
l Double Cab and CrewMax models: Child restraint systems installed on the
rear seat should not contact the front seatbacks.
l Do not use a seat accessory, such as a cushion or seat cover, that covers
the seat cushion surface.
l Do not attach a commercial seatback table or other heavy item to the back
of the front passenger seat.
l Do not modify or replace the upholstery of the front seat.