** Swiped from priuschat.com FAQ **

Smart Entry is user programmable and can be changed to perform in 3 different ways. The following is the layman's description of each option, followed by how to change the settings.

Option 1 (Default) - Driver only on the driver's side, all doors from the hatch or passenger side.

Option 2 - The driver's door can open all doors. I have it set this way as I have a kid in the back every time! It is more convenient to touch my handle before opening the rear door than to use the fob twice, or open my door and unlock all doors, or go to the hatch and do a quick grab (not enough to open) or to the passenger door. This option seems the least conservative of the three.

Option 3 - Drivers door and hatch only open those doors when opened, passenger opens all. This option seems the most conservative of the three.

From your user manual - page 30.

CHANGING THE DOORS TO BE UNLOCKED
Each time you push the lock button together with the panic button
on the smart key for about 5 seconds with the hybrid system off, the
setting for door unlocking will change as follows:

1. Driver’s door unlocking mode: If you perform smart unlocking operation on the driver’s door, it will unlock. Performing unlocking operation on the front passenger’s door or back door will unlock all the doors. When the system switches to this mode, one beep sounds inside the vehicle and two beeps sound three times.

2. All doors unlocking mode: Performing smart unlocking operation on either front door or back door will unlock all the doors. When the system switches to this mode, one beep sounds inside the vehicle and two beeps sound twice.

3. Single door unlocking mode: The driver’s door or back door on which you perform smart unlocking operation will unlock. However, performing unlocking operation on the front passenger’s door will unlock all the doors. When the system switches to this mode, one beep sounds inside the vehicle and two beeps sound once.