Just installed a Pioneer XM radio into my '04 with factory Nav. Used a Soundgate PIOGM1 to hook it in. Works like a charm. XM1 and XM2 now show up behind AM, FM1, FM2. I get the XM text messaging and station info on my screen.
Main drawback is you can't enter a station number directly, you have to scan thru each station 100+ ! (or program the recall buttons at various stations in the range so you can at least get close to a number range)
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