Power window problem

We have the EXACT same problem. Haven't found an answer yet.

My car is doing the same thing. Have you found an answer?

I was told & shown that if you turn the key & hold it in the driver's side door the window will go down, & if you turn it the other way it will go up. Maybe the up & down switch is messed up. Hope this helps you

Yep, same issue with me. I took apart the door to find that a piece of plastic, part of the lock mechanism, had broken which holds a metal rod to the door actuator. Now it free floats within the door panel. And if you slam the door just right it activates the opening of the door and lowers the window. Either replace the whole keylock mech, or I just zip tied the rod back in place.

Funny, I had this issue years ago and everyone thought I was crazy cause I would walk away from my car and hear the window go down as I'd walk into my house. We tried the above suggestions back then and they didn't work. I replaced my battery and I haven't had it happen since, it's been over 7 years since it's occurred. 2003 Highlander. Hope you fixed it by now, but replacing my battery solved that issue. :)

I have the same problem. Mine is a 2005 Toyota Kluger (the Australian name for a Highlander). It is very unsafe. My window usually lowers when it rains. A major security problem! I have no idea how to fix it.

Here is the answer posted on another site: "I had this same problem,it was an easy fix. open your door you will see a black plastic plug near the door handle. pry it out with a small screwdriver shine a flashlight in the hole you will see a red plastic connecting link that should have metal rod with a 90 degree bend sticking through it.. take the plug out of the passenger side door and compare the two. now take a stiff wire and bend a hook on the end and carefully lift the rod back in place.you may have to push it back in the hole with a slender screwdriver while lifting it with the wire. also leave the key in the lock and have someone turn it slowly to help line up. i think this happens from slamming the door to hard. mine hasnt happened again since fixing. you could probably fix this easier by removing the door panel. but i didnt feel comfortable with all the clips." I have a 2003 Highlander and tried this fix for the exact problem (window going down on its own), but to get the rod in the hole wasn't possible because they've changed the design of the red plastic connecting link (since 2001) to make the rod more secure. So i had to take the door panel off. I'm not mechanical, but found it quite easy following the steps on a youtube video "How to remove front door panel 2004 highlander" posted by 1A auto. I didn't have a plastic tool like they recommend for removing sections, but I found that a putty knife and screwdriver worked fine. After the door panel comes off you have to go in behind the plastic sheeting to reach the rod. Still a bit tricky to get the rod into place and I still found it helpful to access the hole where the black plastic plug is removed from (as mentioned above). Now I can unlock the door using the key (which I couldn't before) and I'm assuming I won't have the window going down on its own anymore either. (Just did the fix today so time will tell!)

I have this same problem with the window going down by itself in a 2001 Highlander. I don't see any problem with the rod(s), as referred to above. They seem to be properly connected and routed. I am currently suspicious of the switch in the door key mechanism. The car has a feature that allows lowering or raising the window via the door key.