The lock switch in the driver's door is bad. I've not had the door panel off to check, but it may just be a missing link. I don't know if you have to get the whole lock assembly or not.

Light switch funnies are probably relay related on the front door. Might be a loose connector in the dash (since that will also keep the door lock from activating from the driver's door).

If you have an aftermarket radio, you will need to check to see that the wiring harness hasn't been "modified" by some idiot at the stereo store fishing up a keyed hot wire instead of using the correct adapter harness.

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!