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.
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.
Do not depress brake pedal whilst carrying out the following operation.
Within three seconds of releasing the buttons press just the lock button.
Insert the remote transmitter into the ignition switch slot and close the driver s door.
To exit programming mode.
Learn how to program the door lock settings on your new toyota.
Then press the lock button for up to three seconds and release.
Close and open driver s door twice.
This verifies that the new fob is working.
Repeat button procedure to program remaining remote transmitter.
Within 3 seconds the door locks should lock and then unlock once indicating successful programming.
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.
System should now lock and unlock vehicle once to confirm registration twice to indicate registration has failed.
To program the new toyota key fob hold the unlock and lock button on the key fob for two seconds and then release.
The prius should respond by locking unlocking the doors.
Insert and remove the remote transmitter from the ignition switch slot.
If you are programming multiple remotes repeat step 8 for each remote within 40 seconds of step 7.
The door should lock and unlock.
Press the lock and unlock buttons on the remote simultaneously for 1 5 seconds.
Now if successful car responds with locking unlocking once implying this new fob is now programmed paired with this car.