also check for a broken wire loom from A-pillar into driver door
Shogun tricks and tips for the E32 series are HERE!
Have a look at pages 5126-00 and 01. See that driver's door lock switch Unlocks by placing 12V on the BLU/BRN wire which is on pin 1 of X747 and pin 15 of door frame connector X257.
You can remove the door card and pull X747 (Yellow, 2 pins) shown on page 7100-33-2 at the door lock switch.
Briefly shorting this BLU/BRN wire to 12V should Unlock all doors. If not, then as shogun says the BLU/BRN wire might be broken.
And briefly shorting the WHT/RED wire at pin 2 of X747 to 12V should Lock all doors.
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