It could be several thing's, fuse's , circuit breaker's , broken wire's inside the rubber boot from the car body to the door , this happens a lot on older vehicles from opening the doors over the years . The drivers door is the master switch . You need to find what fuse's , circuit breaks Power these systems . You can find that info. here
http://bbbind.com/free_tsb.html . check for B+ voltage with a volt meter at the door switch an also check grounds . There are videos on youtube - basic automotive electrical trouble shooting , how to read wiring diagrams (if you don't already know) . I'm looking at a wiring diagram now , I also see that a BCM - body control module is shown on the diagram . Do you know what a BCM is ? You can google it .In automotive electronics,
body control module is a generic term for an
electronic control unit responsible for monitoring and controlling various electronic accessories in a vehicle's body. Typically in a car the BCM controls the
power windows,
power mirrors,
air conditioning,
immobilizer system,
central locking, etc. The BCM communicates with other on-board computers via the car's
vehicle bus, and its main application is controlling load drivers - actuating
relays that in turn perform actions in the vehicle such as locking the doors or dimming the salon overhead lamp. If you are not familiar with these thing's your best bet would be to take your vehicle to a qualified repair shop that does .