Rick,
From what I've found on other sites, your NAV (PN 15800001) is Y91 "LUX" Bose unit. Unfortunately, all 2005 H2s use the "PREMIUM" Bose audio. Therefore PN 15800001 will not work with the factory amp in your truck.
You'll either have to swap your NAV unit to a "PREMIUM" unit, or swap your amp to a "LUX" unit.
Don't get the H2 trim option (base, adventure, lux) mixed up with the "LUX" or "PREMIUM" Bose audio. 2003 and early 2004 H2s all came with "LUX" Bose audio. Late 2004s and beyond (not sure yet about the 2006s) all have "PREMIUM" Bose audio. H2 trim options made no difference.
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