Well not sure how to answer this but here goes. When I tested the CLP/SSM only one line responded at all with pressure. If there was indeed a vacuum on any it was negligible. Yes I know about the key fob and that you can set it up two different ways. That is not the problem. I have not yet opened the unit. When I drive the car the drivers door will lock like it should however the other door does not lock (ie when reaching 5 to 10 MPH). I can hear the pump run for a while then it stops after time out. Pushing the key fob I can get the driver door to lock and unlock but not the passenger door the fuel door or the rear hatch. Those 3 remain unlocked no matter what.