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2003Z...pressed the power unlock button inside the car but only the driver side door lock unlocked. The passenger door lock is half way between locked and unlocked. It will move fully to the locked position but when I attempt to unlock it again it sticks between the locked and the unlocked position. It looks like when you're trying to unlock the passenger door and the passenger grabs the handle at the same time. Except this time it wont correct itself. Mechanic thinks he needs to remove the passenger seat so that he can get at and remove the door panel with the door in the closed position. Is there another, less painful way to get the door open?
I had this on one of my Zs. Id hit unlock and it'd get stuck halfway (more or less locked because i still couldnt open). I'd hit lock again, then unlock once again and it'd open.
This was due to taking the door apart and putting it back together wrong, but sounds like you have a similar problem. I suggest you do the relatively simple task of taking the door apart and observing the internal components as you lock/unlock with your remote.
OP states the door won't unlock so taking the door apart to observe the mechanics is not an option. I don't think that taking the p-side seat out will help either.
I had a similar problem and figured out that it was due to a loose connector pair in the electrical harness that runs between the door and the interior. I had pulled some speaker wires through the harness and managed to damage one of the connector pairs.
I took it to a dealer and they said they could only tear apart the door panel to get in there and that I would have to pay for a new door panel. They thought that maybe the lock actuator in the bottom of the door had gone bad.
One day I hit a series of small bumps in the road and it started working fine. That's when I realized it was something loose in the wiring.
Mechanic says the door can't be slim jimmed...is this the case? I find it hard to believe there is no way to unlock my passenger door without punching a hole through the door panel. I see no way of removing the door panel while the door is in the closed position. Please tell me there is a way to unlock the door without destroying the door panel!