I had the same problem, and I fixed it the easy way. If you only open / close the locks with the button on the door and with the remote keyless entry this will do.
Take the door panel off and remove the original door lock actuator, it is located on the bottom left of the door. Replace it with an aftermarket door lock actuator ($10-15) and wire it to the yellow wires. Do not hook up the red, blue and black wires.
The "new" door lock actuators will work with the keyless entry or security system, and from the lock/unlock button in the door trim. When you manually lock/unlock the door it will NOT lock/unlock the other doors.