Hummer Onstar volume solution!
#1
Hummer Onstar volume solution!
I have a 2003 H2 with an aftermarket radio installed.Have not been able to find out why the onstar volume was so low.After a lot of research I discovered that the wireing harness has a black and yellow wire that you can touch on ground to increase volume.there are 4 settings.I am going to install an intermittent switch so that I can change it while driving.
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gregaac
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02-11-2008 09:48 PM