2010 Prius. Will not auto-lock doors

Have you misplaced any of the FOBs or are they all accounted for?

 

Having a FOB inside the car is one thing that will cause this.

Having one (or more) of the electric lock actuators fail can also cause it.

If that is the cause, you might be able to hear the system trying to lock 3 or 4 times before it gives up and leaves them all unlocked.

What he described really is not "automatic" locking.

 

Disconnect your 12v battery for a few minutes. This is equivalent to to someone telling you to turn off and restart your computer to fix it. If that doesn't work, try inspecting each lock mechanism, as well as cleaning, as well as exercising/overusing them and then reset again.

 

NO, while that seems logical it doesn't work that way.

The system "knows" if one door does not lock after repeated tries and then leaves them all UNlocked......so it will be a bit more obvious that something is not working right.

 

Just spit-balling here; have you tried to manually toggling each door lock switch; to see if you feel a difference on one door as opposed to the others? That may point you to the door / actuator that's causing the entire system to lock-up.

 

No, the physical lock itself, Not the electronic lock button. Don't forget to check the rear doors too.

 

The other doors rely on the drivers door actuator switch to work. Replacing the drivers actuator (it controls all for doors) might solve this. I did this to my sons car and it fixed the issue.

 

That fixed his issue.......but not for the reason that you think.
ALL of the door locks rely on all of the rest of them to report back a successful lock.
ANY of them that fails will prevent all of them from staying locked.

So in your case it WAS the drivers door that was bad........but it does NOT "control" all of the other doors.
The conclusion you reached is not valid. You just got lucky.

 

$650?????? How much is the part????? $500???
They are simple to change. And you can find them online for probably about 90% less...
But, it's your car...

 

I got mine off the internet for my son.

 

Some things never change.

Like YOU thinking that everybody has the skill, knowledge or will to do stuff that
you think is "simple or easy".

YOU need to get over that.
People can decide for themselves what is "simple" for them.

 

What did you decide to do? Pay them to fix it?

 

Of course it could be something else but ANY of the actuators failing will cause the problem.
Trust me, I've had it happen on 3 different models.

 

Well, you know it's NOT the actuator... and they should replace the
original one, and NOT charge you for not fixing the problem...