2006 Jetta TDI 4-door sedan driver's door electronics quit. No window, lock, fuel door, nothing. Neither fob works this side of car. trunk opens occasionally with fob. had window regulator replaced two years ago. Thanks!

No button is available you must buy the whole switch or "Jerry rig" them with some other knob from Radio Shack

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switch is unplugged or u have a blown fuse

Maybe someone was a bit to energetic opening the fuel door

weak battery. also could have failing door latch

There is a known issue with the wiring harness in the doors. It's possible that the passenger door also has a bad harness (assuming they swapped out the one in the driver's door) Is that a correct assumption? It may still be related to your original problem too. I've heard of disconnecting the battery for 20 minutes to reset the electrical (door switches). You should def give that a try - it's free.
Also check out the forums at www.tdiclub.com - those guys know their VW TDI's...

do u have a good battery

WHAT IS THE RIGHT TIME TO CHANGE THE TIMMING BELT

try looking between the front door jam and the door that is where the connection point is for the door electronics. you might have to pull the kick panel there to see if the door bulkhead connector has worked it's way loose as it did on mine

Look for a short in the wiring harness in the door. The wires from the door lead to the convenience module (controls the doors and windows and some other settings including remote fob) that is under the dash. It sounds like some wires are crossed. VWs are also notorious for having problems with window regulators. They make the windows go up and down and are in the doors. Something might have happen to that and it cause a short. VW just extended the warranty on the window regulators to seven years because of these problems so you should be able to take it to a dealer and not get charged (this is in the U.S. at least, don't know about the rest of the world). The extended warrranty was not limited to original owners but you might want to ask the service people about it first.