Removing the door panel won't gain you access to the door locks. You have to remove the outer door shell to gain access to the latch assembly.
I can say with complete confidence that your door harness needs to be replaced. I do about 1 every other day at VW on mk5 jetta's. To test it, open up the door fully, look in between the door and body, you see a thick corded rubber piece. Remove the rubber from the body side of the harness with a little pick or flathead, and pull the rubber as far back as you can. You'll see about 20-25 wires. Inspect them all, you'll probably notice that the large orange wire is broken. If so, replace the harness.
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Tuesday, February 14th, 2012 AT 4:00 PM