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Usually there will be a broken wire or 2 in the door wiring harnesses. Near the hinges for each door there is a rubber boot, inside are the wires for the door locks. Pull back each boot and take a look at the wires. If there is only 1 or 2 broken wires, you can splice them, but it get tough to do when there a a lot, and then it's best to replace the whole door harness. It's not easy, but can be done by a reasonably handy person.
Whenever the battery is reconnected the alarm will go off, it's just the way they are designed. I usually just hook the battery up and then disarm the alarm with the key in the door.
ok so the same thing just happened with my jetta. So heres what worked for me: take off the door panel (drivers side) and you should see some melted or bunched wires together. just snip them and leave them be. It was either the wires or the sensor that messed everything up. This should work.
Same problem on 98 Jetta at about 9 yrs of age. Wiring harness was an expensive job. Dealer replaced all wires going to doors so that alarm isn't mistakenly triggered by opening doors. Dealer offered to remove alarm for a few hundred dollars, but couldn't assure us that the key fob would still open the door locks. Who wants to give up power locks? My hunch is that wire in driver's door breaks with flexing over 9 years. Could consider replacing short stretches of wire in hinge of drivers door if you're handy with a soldering iron.