The pump for this system is located under the back seat and is seperate from the main engine vacuum. We have checked the sytem out pretty thoroughly on the elctrical side. Bottom line, the pump is not recieving a signal from any of the locks, ie, Driver, Passenger, Trunk. It acts as though the signal is getting lost, mabey grounded out some where OR the system is not grounded and no signal or power is getting to the pump. Based on what you guys have said I think we need to go through the whole thing again AND check both the signal and power lines to and from the pump. By the way the pump is good it has been bench tested and works perfectly. Thanks for your inputs. Lee