Door Sensor problem ...

to answer your #2 point: If the switch is like other cars, it provides a closed circuit to ground when the door is open which turns on the lights etc. When the door is shut the switch is open, and as far as the car is concerned its the same as if the wire is disconnected. I'd try replacing the switch.

 

Since I haven't verified this circuit personally on the Prius for your year, I won't tell you to do it. But if you can establish to your satisfaction from seeing the switch in person, that it indeed grounds the wire when the door is open you could ground the wire which goes to the broken switch manually and assure yourself that all the other circuitry is working correctly. As in the door is "open". If that works, you know its the switch and nothing else.

 

Glad to have helped!

 

This fix my problem! of horn going off randomly not fob alarm button. first the car lock driver side stopped locking so I remove actuator assembly take apart the motor cleaned the contact point on the motor and the handle auto unlock stopped workingand soon thereafter random horn honking turn out to be the lock was out of sync. I grab the door handle and the fob light would come on but the door would not unlock and the dome light did not turn on so my fix was removing the door panel completely so the whole wire harness is exposed I'm with the car off disconnect the wire harness on the little box I assume as the frequency controller for unlocking the door. and without touching anything metal sitting in the car with the door closed undo the wire harness for two seconds to that box and the one next to it and reconnect them then door worked fine. if you do have a problem getting the door lock to line up with the lock key assembly use a piece of thread to hold it down on an angle towards the inside of the car then tell the lock assembly towards the outside of the car and push should pop into place you'll have to do it a few times and I also taped the lever that goes into the handle to unlock the door so it doesn't fall down and get turned around I taped it so it stay the same angle saved a lot of time thanks for the tip.... I just did it a different way then removing the screws lazy I guess sorry I guess I don't have permission to post pictures app telling me odd done it lots of times

 

My problem was the horn alarm was going off randomly and the touch handle unlock sensor was no longer working the button to lock on handle works fine. was not the fobs. Started with a bad actuator. door were not locking so take apart actuator cleaned motor contacts put motor back together reassembled actuator taped actuator arm to the right position just to make my life easier underneath shalf to hold up the same direction as it goes in to the handle then use thread to hold the locking key part down and to the right while moving the actuator tilting it towards the outside of the car to get them to match back together this is when my problem started with the horn to fix it I ended up reading this post then I just unconnected the two cables coming from the lock assembly to the frequency box for two seconds without touching any metal in the car with the door closed and then reinstalling wire and the horn stopped making noise and the door handle started working thank you for the info see the pictures

Letting me send the pictures now.

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