As you all know XM is native to Lexus, unlike Sirius. To install Sirius, the head unit has to be pulled. With XM, the install was simple.

Remove carpet from trunk. Attach XM unit to pillar on right using the provided bracket. Piggy back to ML Amp and Antenna (uses the GPS Shark Fin) using a harness. Done in 30 minutes.

Some quick pics with my Blackberry phone.

Mark Levinson amp on right.

 

Stripped Bare.

 

XM Mount Location

 

A couple questions...

Did you use the stock IS Kit (86100-0W220-08)?

Are all the plugs there in the harness already? I mean does it plug right in and you don't have to splice any wires?

 

Yes and Yes. Good luck.