I just experienced the same thing. Passenger door wouldn't open from inside or outside, even with the key. I also heard the weird noise after using the unlock button. I also noticed the lock would not stay in the unlock position. It would make the noise and go back to half unlocked. Dealer wanted $500 to fix. I fixed for nothing after opening door.
I opened up the drivers side and used that as a reference. First I rolled the window down. I then acted like I was working on the passenger door like normal although it was closed. I got as far as undoing the door handle plate behind the door handle, passenger switch and the three screws at the bottom of the door by maneuvering the seat around. I then pulled the door panel up and back towards inside of car as far as I could with the goal of removing the panel and not breaking it, the best I could manage was slightly pulling the top lip of the panel that tucks behind the door; flush with the door. This let some light behind the door panel and enough room to work in. I couldn't tell whether the rod clips where broken or not, but I determined that I could over ride all the rods and clips by manually moving the parts that attached to the latch. I pulled on the door lock with a slim jim and pushed a metal tab with a socket holder (custom tool). One part was the metal tab connected to the door handle and the other was the rod connected two the lock part of the latch. This week I also fixed a broken solder point that wouldn't allow the drivers side window to roll up, and a broken switch (well the prongs that connect to the slider that makes the window roll up and down. prongs on the bottom of window switch look like the bottom of a tooth. one prong was broken. Both were solved with using a solder gun. (Thanks Ben and his shop "Elite". The solder point on the circuit board was not easily noticeable, but a simple touch of solder and the amp was rolling again. The switch prong that connects to the slider was easily fixed, but no solder. I just slid the hot solder point up and down the prong welding the plastic together (prong was almost broken in half). If plastic is to broken you can also melt that down and mix it in with other plastic pieces just like welding.
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edited just to say, I have a second motor if your interested pm me.
Modified by reezn at 6:19 PM 10/26/2008
Modified by reezn at 6:27 PM 10/26/2008
Modified by reezn at 6:57 PM 10/26/2008
Modified by reezn at 11:29 AM 10/28/2008