The easy check--not necessarily fix, you have to figure out the problem first--is to open the door wide and check the rubber
boot that the wiring harness runs through from door to body. It's a bit of a pain, but you can pop one end of the rubber boot
off (usually go for the door end) which will give you a limited view of the wiring bundle. Look for damaged wires. Sometimes you'll
get chafing at this point, especially if the rubber boot is damaged or missing, and wires will break or ground out.
Door panel itself is easy to pull apart.
1) Pop little squarish covers off arm rest that cover mounting screws. Remove said screws and arm rest.
2) Carefully pry door handle trim piece out while holding handle open.
3) Start pulling (again, carefully) plastic fasteners that hold panel to sheet metal, each spaced about 6" apart.
I'd suggest getting a cheap panel/fastener tool from Harbor Freight or what not to lessen the chance of breaking
these plastic parts.
4) Lift panel out of top channel, and unplug harness connectors for master window control and master door lock. Or leave plugged in to test.
Takes all of about two minutes to open a doors guts up.
Edited by SmashedGlass, 24 July 2013 - 09:51 AM.