[marin8703]

mine is working.

the answer from your installer that it definately couldnt be from teh install is BS. im not saing it is, but "definately" sounds BS. there are plenty of things he could have done while under the dash.

the lock button is connected to what looks to be a dark blue wire which goes to every single door. i think they travel under the dash in some harness to the other side.

looking at the wiring, if the wire is cut, then the window wouldnt operate at all, because that wire is supplying the power for the the switch.

hmmm... interesting. can you 100% confirm that all the otehr windows work (from their own door switch) and that this one does as well. and confirm that they all lock except this one.