How to access the OBD II on Cadillac STS 2004

Hi guys,

I just bought a Cadillac STS 2004 (the old model) with the build-in navigator. When starting I get the message "Service Suspension System" in the display. I would like to go deeper on that, but don't know how to get all codes displayed on the OBD II (or whatever it might be for a 2004). I knew how to do that on the 1996-97, but this one has way fewer buttons and the combinations I tried didn't work.

Please help,

Leif



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my guess  is that your struts have failed.