GMC Repair: IS THERE A RESET FOR YOUR AIR SUSPENSION, air suspension, rear end

Question
MY 2002 ENVOY'S REAR END HAS DROPPED.  THE COMPRESSOR IS COMING ON BUT NOTHING IS HAPPENING.  I CHECKED THE FUSES, AND THEY ARE ALL GOOD.  CAN YOU TELL WHAT TO CHECK NEXT?

Answer
Hi
No there is NO reset for this system.
There is a lengthly relearn procedure that helps sometimes. I have had success with it about 60% of the time.
EVERY other time, it has needed the air suspension sensors on each side or on the side that is not inflating.
I Hope this helps.
JUST ADVICE from experience.
Good luck
Pawl