An update from this earlier thread.
http://toyotanation.com/forum/t125366.html
Works great!
Not really a real tough install.
Tapped into the maplight plugs with one of the wires from the mirror.and then ran a wire down to the fuse box.
Side air bags didn't come into play as I followed the wire on the dealer installed remote start unit.
The remote start sensor is at the top of the windshield on the driver's side.
Didn't remove the a pillar air bag covered piece.
Wiring went from mirror tucked under headliner to under the door weather strip.
Pulled the driver's side door weatherstrip down and tucked the wires under the strip and to lower area and then tapped into the fuse box.
Tucked weatherstrip back and everything is fine with a nice stock look.
Now have the dimming feature mirror with the map lights.
Map lights work without the ignition on but the dimming feature only works with ignition on.