What is service suspension system on dash at start up refer to?

It is telling you that a component of your suspension system is not functioning properly. It cannot be cleared with the "info" buttons and you will need to have a dealer or shop investigate and determine the cause. Then you can decide how to approach fixing it. I had a '93 DeVille that kept giving me that signal and I finally had the signal disabled because nothing was ever found to cause it. Ran fine for 13 years until I sold it. Air pump still functioned and all shocks lasted the 180K miles I put on the car.