There's a circuit board in the electrical system of all the latch modules, sometimes the solder joints go bad. Same thing on my right-rear door; everything tested fine, but the thing didn't register open- What I did was solder a wire 'around' the circuit board from the microswitch to the harness. Basically get your test light out/ multimeter and test the wires in the electrical connection to the latch, find out which wire that when grounded turns the dash indicator or the courtesy lamps on. Better yet and what I did was have my laptop out with VCDS in the proper measuring block to tell me the state of the latch.
Then solder a wire to that wire back to the microswitch, again you'll have to test to see which side of the switch to solder it to- but you're basically bypassing the board to the harness. ...
Or its a broken wire waaaay back in somewhere.
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