Welcome to the club Maybe the insulation around the antena connection or the insulation around the defrost connection, I beleive they both connect on the same side of the rear glass.
Randyman, I have a full 2007 ES navigation system ready for installation if interested, It is a factory system, No aftermarket here. PM me for information. B) Welcome to the club
I have a 2008 RX nav system with all the wiring harness one needs for a factory install, It has the latest map. It will fit like a glove in a 2010 RX. Sourcing a 2010 nav is near impossible. Not much difference between the two. And Yes, It is pricey.