To answer your question:
I was under the assumption that the 2005 4Runner Nav unit does not support satellite radio because:
1) It does not have the "SAT" button on the right,
2) I have not seen a press release from Toyota announcing XM Radio availability in the 4Runner,
3) There is no indication of it being available in any of the Toyota literature, and
4) The number of people on this forum who use FM modulated Sat radio.
_ _ _
I also never see mentioned whether or not you lose any vehicle-specific functionality when switching over to the Camry/or Solara Nav unit. Any ideas on this?
I really have no problem purchasing a Solara unit and changing over the LED's. Not a big deal, just a little time consuming. But perhaps the best idea would be to check out VAIS Technology's offerings when they become available this summer, or Coastaletech's.
-Thanks