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So I installed the factory navigation into my 2008 silverado and everything plugged in and worked like a charm, except it didn't recognize that I have XM in my truck. I brought it into the dealer to have it Tech II'd and to have the options installed, but after 6 hours they informed me that the radio is not compatable with XM...


Does anybody know if this is infact true? That there are 07/08 dvd lux factory nav units out there that don't contain XM compatability?
 

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I believe this to be true. I have an 07 Sierra SLT package with the factory navigation system and XM was NOT an option because it's not compatible with the system so I would have to have XM installed with an external screen device. Very lame!!
 
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