Search the forum; there is a lot of info on the door locks and vacuum. There is a major junction box under the carpet at the front passenger's feet. Generally you go here to start working with the Mityvac to see where you do and do not have vacuum. If every lock is not working, you may very well have a bad vac pump in the rear tire compartment or a hose problem back there. If they all work and one or two just go out, it is generally a $25 actuator which is inside each door.