Hey H3 Hummer,
I got the same problem after I went thru a "drive thru carwash". The Onstar system started to come on every minute or so for at least 30 minutes. When I took it to the Dealer, They told me that the antenna seal was leaking and that was causing the short. They went ahead and re-sealed it. I didn't have any more problem. So have your dealer reseal the antenna area and you should be OK.
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