My guess is that the wires get run through the seatback and then under the carpet and/or through the center console.
Myself, I'd think about going with the GM headrest replacments instead.
http://cgi.ebay.com/ebaymotors/DVD-Headrest-Entertainme...QQrdZ1QQcmdZViewItem
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H3 Boulder Gray - 2006 Adventure|CD-MP3|XM|Roof Marker Lights|Husky Front Mudflaps|Brush Guard|Rocker Bars|UC Protection|U-Steps|Garmin GPS|Garvin Roof Rack|DVD Headrests|
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