Driver's door switch is bad, or the aftermarket alarm is screwing up the signals -- if the trunk lock works properly, it can only be the door switch.

Most likely you need to replace the actuator in the driver's door, as I believe it contains the switch. Only the alarm switch is in the actual lock.

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!