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How do I fix my onstar ? on 2006 Hummer H3

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
There's a red light on to the right on the mirrow. Is there an aux. battery located somewhere .If so where is it located? When I push the button it says "Phone unavailable"
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