I have been having serious issues with my air ride suspension on my 2002 Envoy. The pump went out severa months ago...I have just replaced the pump but after replacing the pump, it seems the vehicle doesn't recognize the new pump. I have checked the fuse which is ok. I also checked the light on the switch for the compressor hose which is located in the rear hatch compartment. The light doesn't come on when the switch is depressed. Is there anyway you can reset the system, or is there electrical problems that I'm not aware of. Any help would be great...I'm begining to become very frustrated.