I have a 2005 H2 and I am currently in the process of upgrading my stereo system.. I am using Soundgate's Digistar and my OnStar is currently inoperable.. Soundgate has E-mailed me and confirmed that their is a problem with their Digistar adapter and 2005 H2s(they told me that GM might have changed something"?" ).. it's been over 2months and I'm still waiting.
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