The switches on BOTH doors are not working? If it's only one set of lock switches not working, try swapping them with the other doors and seeing if it now works. Obviously they are shaped right-left so you can't install them, but you'll know if the problem is due to a bad switch module. (alternatively, if you know your way around an electrical schematic, you could test the pins for proper voltage). If the switches are working, you may have a problem with the lock actuator - it may seem like a longshot that more than one door's lock actuator would fail, but I've seen it happen (I've had two fail within a day of each other on the same car). Hopefully I've understood your problem correctly.