I just installed a new nav unit in my o5 hummer it did have the y91 package everyone says i need for it to work it had a 6disc changer with xm before this nav unit was installed the dealer unlocked the unit but it doesn't have any sound other than that all the controls and screens function properly as far as i can tell could this be i have the wrong amp for this nav unit? the model number on the nav unit is 15800001 any help would be appreciated oh yeah by the way the dealer said that gm tells him this can't be done but i have heard of to many of these being done already ???
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