Driver's door would not lock.
Micro switch to detect if it was open was not working.
Took lock module apart looking for bad solder connections, turned out to be dirty microswitch that I could have fixed without taking door apart.
I find that there is too much bad information on forums, and it's hard to weed through it all to find the gems.
Driver door on MK4 not unlocking?, alarm re-arms with the driver door open? First spray the heck out of the latch with electronic parts cleaner....That would have solved my problem...
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