If the backup remote is able to unlock the doors then you know that it is a problem with the key fob and not with your vehicle s locking system.
Programming a prius fob for door locking.
Then say 1 second after the car stops locking unlocking due to step above press down both buttons of the old fob simultaneously then say after 1 second press the lock button of the new fob.
Now if successful car responds with locking unlocking once implying this new fob is now programmed paired with this car.
If you have a second key remote and you haven t already done so check to make sure this works so you can be certain it isn t a problem with the door lock functionality.
If you are programming multiple remotes repeat step 8 for each remote within 40 seconds of step 7.
Immediately after letting go of the lock and unlock buttons press the lock button by itself and hold for 2 seconds.
Press both buttons on new the fob simultaneously and hold both down for a second and a half.
Close and open driver s door twice.
Learn how to program the door lock settings on your new toyota.
Within 3 seconds the door locks should lock and then unlock once indicating successful programming.
Note a maximum of 4 remote transmitters can be programmed.
Press the lock and unlock buttons on the remote simultaneously for 1 5 seconds.
System should now lock and unlock vehicle once to confirm registration twice to indicate registration has failed.
Learn how to program the door lock settings on your new toyota.
The prius should respond by locking unlocking the doors.
To exit programming mode.
To program the new toyota key fob hold the unlock and lock button on the key fob for two seconds and then release.
Do not depress brake pedal whilst carrying out the following operation.
Within three seconds of releasing the buttons press just the lock button.
Repeat button procedure to program remaining remote transmitter.
This verifies that the new fob is working.
The door should lock and unlock.