Ok so the rear passenger side of the car is sagging. Upon inspection we cannot find any cracks or leaks in any components & it seems the airbag will not air up at all! All of the other bags are airing up & working perfect. The only message says that it's a air suspension control module failure but like I said all are working fine except that one. So I don't know how to tell what the actual problem is. The only tests I can find involve airing up the bag and testing pressures but I cannot get the bag to air up at all even with external compressed air. Any help would be much appreciated!!! I'm usually pretty good and I work on cars daily but with air suspension I'm kind of at a loss. Oh and yes I checked all fuses/relays...the airbag is getting power.