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FWIW--check your glove box sticker to see if RPO code Y91 is listed; if so, then you have the lux amp in your truck and will need nav radio part number 15204335 in order for it to work correctly (e.g., able to hear sound). Basically, there are two INR units--one that is programmed to work with trucks w/o Y91, and one that does work w/ Y91. You can get a nav unit designed to work w/ Y91 to work correctly in a non-Y91 vehicle if you can find a Y91 amp and related wiring; this is what you may need to do if you do find out you don't have Y91 and you're unable to unload your nav unit.
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