Find yourself wiring diagrams an test the electrical circuits . Do you know how to use a DVOM - digital volt ohm meter ? How to take the door panels off an check power an ground circuits to the switches ? If not , your best bet would be to take it to a qualified repair shop. You probably don't know what serial data network is ?
The B+ power for the door locks & power windows comes from a circuit breaker ,not a fuse . Circuit breakers very really fail .
You probably have broken wire inside the rubber flex boot from the body to the driver door .
Dodge Grand Caravan No Power Window No Power Locks CAN Trouble
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