H1- ctis problem

[jm32262]

Hi- my ctis does nothing, checked at hummer dealership -they say it worked there- but my rear tires are both brand new- loosing air about 5 lbs every 2-3 weeks, they will not blow themselves up when i push the button to inflate--is there a trick to doing it? I have the engine running,and press the ctis button to inflate-rear, i also tried inflate front and all, nothing, thanks