Help when using air pump accessory? 2005 SUT

[jeffrey2002]

When using the air pump accessory I screwed in the hose and air was pumping through it as soon as it was attached with out turning on the switch. Is this supposed to happen? I turned on the switch and the air did not come out any stronger. I then turned off and air was still coming out. I saw a message on the dash computer saying service air suspension. I turned off the car restarted and did not receive message again. Can someone please explain to me how this should work?

Thanks,

Jeff