It's quite possible that the door lock actuator is simply broken. On my truck, one of the plastic parts that connects the actuator to the lock broke. I could hear the lock mechanism activate when using the remote but it wouldn't physically move. I had to replace the entire lock mechanism which is moderately difficult and includes removing and replacing grommets. The parts just around $100 if I recall correctly. Definitely can be done by any independent mechanic.
Don't know if this is your problem. Can you hear anything mechanical from the drivers door before the synch problem? If not it might be as simple as the electrical connector being loose or dirty. That's a really easy fix; just clean and replug.
Good luck with the synch and fix. Too bad about your problem with the dealer.
Don't know if this is your problem. Can you hear anything mechanical from the drivers door before the synch problem? If not it might be as simple as the electrical connector being loose or dirty. That's a really easy fix; just clean and replug.
Good luck with the synch and fix. Too bad about your problem with the dealer.