TOYOTA 2012 Tacoma - Manual (Page 426)

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4-3. Do-it-yourself maintenance
Press and hold the tire pressure
warning reset switch until the tire
pressure warning light blinks
slowly 3 times.
Wait for a few minutes with the engine switch in the ON posi-
tion, and then turn the engine switch to the ACC or LOCK
position.
Registering ID codes
The tire pressure warning valve and transmitter is equipped with a
unique ID code. When replacing a tire pressure warning valve and
transmitter, it is necessary to register the ID code of tire pressure
warning valve and transmitter. Have the ID code registered by your
Toyota dealer.