The previous posts can be misleading, there are two pumps on the car, the closing assist (draw-in) which is located on the top of the drivers side rear wheel and has red hoses coming from it. The lock/unlock is under the passenger side rear seat, the lock /unlock elements in the doors trunk and fuel door all share the same hose and are a yellowish hose coming from the pump. If only one lock does not operate it is typically a element associated to that door, if "all" dont work it is probably a bad pump. There is a tool called a MiteyVac that allows you to draw a vacuum on a hose and see if it holds via guage. If it does show a leak it is a function of tracing it to either a hose connection or element. There are "ts" and door jamb connections involved. It is pressure to unlock, vacuum to lock.