Want to add a method to lock doors from rear of car, when in ready mode.

Wiring info 2007 | PriusChat

has a list of wires/pins in text form in the 4th post. There is a note on the unlock wire that it is a double pulse. That suggests that the lock wire might also be pulsed, as opposed to the more typical "pulled to ground when engaged", as for instance, on the door open sensors. Anyway, I would start by putting a voltmeter on that wire and see what happens when the power lock "lock" position is pressed. If it is a pulse it might be too fast for a digital multimeter to see, but if you happen to have an old analog voltmeter the needle should at least twitch when the pulse goes by.

 

When the car is running and the key is inserted into the ignition slot, the door closes easily with a mechanical key.
All doors are locked immediately by turning the mechanical key.

 

I know the car has a "lock automatically after TIME if the key is out of the ignition and the doors are closed" mode. I made sure it was disabled on our car. Anybody know if a Prius has a "lock automatically after TIME if the key is in the ignition" mode? That would serve the same purpose. However, I would only turn that on if I always had a physical key on me. Otherwise it is pretty much guaranteed to lock you out of the car at some point.