70runner Posted August 30, 2009 Report Share Posted August 30, 2009 09 Silverado: HU, XM, and camera working, but no onstar, chimes. For those familiar with the GMOS non-amplified install, when I attach the yellow wire from the GMOS 12 slot connector to constant 12v source per instructions, the HU turns on. This can't be correct - or the HU would be on all the time, until the battery dies of course. Bad GMOS or ??? Quote Link to post Share on other sites
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