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Sounds like there is a coupler in the multiplex that may not be fully connected. Multiplex is the control switches on the drivers door. If the issue is sporadic sometimes it is getting power and sometimes its not.
if it only works on one speed check the resister pack for the fan motor,also if it is electronic it could be the control head/module,did the locks stop working at the same time ?, if so check the basics, the fuses,circuit breakers are usually for door locks or power windows/headlights type circuits,
Check your fuses under hood and on dash. Some of these use two different fuses for rt. & lt. Look in you owners manual for the correct fuses to check. If it is a fuse problem, you will have to find out why the fuse was blown. Good luck
make sure than you have not split any fluids on the passenger front door most of the times is where the module to control the windows and doors is located, try by unpluging the batterie and the after a minute plug it back and see what happend but if any of your ft doors have been split with liquid or rain has gone inside then most likelly the module got moisture and not working