Toyota 2012 Prius Owner's Manual page 137

1-4. Opening, closing and locking the doors
Smart key system (with entry function)
The following operations can be performed simply by carrying the
electronic key on your person, for example in your pocket.
(The driver should always carry the electronic key.)
Unlocks and locks the side doors (→P. 109)
Unlocks and locks the back door (→P. 110)
Starts and stops the hybrid system (→P. 238)
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PRIUS PHV_OM_OM47818U_(U)