Toyota Tundra Quick Reference Manual page 75

Locking the front doors from the outside without a key
Move the inside door lock button to the lock position.
Close the door.
Vehicles with power door lock system
The door cannot be locked if a front door is open and the key is in
the engine switch.
Rear door child-protector lock (Double Cab and CrewMax models)
Automatic door locking and unlocking systems (vehicles with
power door lock system)
■
Automatic door locking and unlocking functions
● Locking function: All doors are automatically locked when the
vehicle speed goes above about 12 mph (20 km/h).
● Unlocking function: All doors are automatically unlocked when
the shift lever is moved to the P position with the engine started.
1-2. Opening, closing and locking the doors
The door cannot be opened from
inside the vehicle when the lock
is set.
These locks can be set to prevent
children from opening the rear
doors. Push down on each rear
door switch to lock both rear
doors.
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