OnStar is not available in the Hummer H1.
It was demoed in the H1 Alpha Concept, which had OnStar and a Vortec 8100 engine. It never made it into production.
OnStar was not present in any of the 18 2004 H1's that I either drove or saw in April during the Phoenix Hummer Conquest event.
Sorry!
Steve
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1997.5 HMC4 Hummer H1 w/Slantback shell (Mine)
2006 Hummer H3 Adv. Package (Wife's)
M101A2 Trailer
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