Chances are it is your switch. The dealer can't find it, because the terminals crack inside and sometimes they work, sometimes they don't - that is when you get the Service 4wd light. If you go back and read the entire thread, I've got some pictures on how I replaced my switch almost 3 years ago now - haven't seen the Service 4wd light since. Though we've only put about 20k on it since then. It sits in the garage a lot since we bought the Trailblazer.
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