Could be the car alarm. I don't think the door locks work off this circuit, but I suppose you could unplug the lock motor (it's in the trunk under the floor cover) and see if that fixes it. I'd bet it draws more than 1A though.
I don't have a wiring diagram for the W126, so cannot help more than that.
Peter
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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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