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2005 Silverado NAV system


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I have a 05 Silverado and trying to install factory NAV radio out of 05 Escalade. I installed the unit and had it reprogrammed but get on sound. The tech told me he could not get the radio to communicate with the amp. I have the amp out of the Escalade and tried it but still no sound. I can put my original radio(factory 6 disc Bose system) back in and everything works. Anyone know how to make this work?

NAV system part # 15230099

amp part # 15114454

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