Looking at the wiring diagrams in the FSM, the diagram for the alarm system seems to have good info. The alarm system module is in the passenger foot well, and gets either "arm" or "disarm" signal from each of the front doors and from the tailgate. This is the same signal that goes to the CLS pump to open or close the locks. Checking for this signal at the alarm system connector is one way to see what the driver's door switch is signaling, and much easier than digging down to the pump. I will also be able to put a signal (ground) here for open or close, depending on which wire is grounded, and check that signal to the pump. On the door switch side, check to see if that signal indeed is grounded continuously, and then move the wires at the according joint for the driver's door to see if I can make that signal change, which would point to a broken wire.

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Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC