Toyota 2013 Avalon Hybrid Owner's Manual page 464

The rear door cannot be opened
●
Is the child-protector lock set?
The rear door cannot be opened from inside the vehicle when the
lock is set. Open the rear door from outside and then unlock the
child-protector lock. (→P. 136)
The trunk lid is closed with the electronic key left inside
●
The function to prevent the electronic key from being left inside the
trunk will operate and you can open the trunk as usual. Take the
key out from the trunk. (→P. 118)
AVALON_HV_U (OM41451U)
What to do if... (Troubleshooting)
489