Scott -
Please use the Advanced Search feature to look for previous discussions on the Lexus RX330. There has been a lot of information passed back and forth - a lot more than can reasonably be repeated here.
Thanks
Also, check this thread - be sure to go all the way to the end.
http://www.trailmanorowners.com/foru...ead.php?t=3928
The owner of a BMW X5 was having trouble getting a brake controller installed, because BMW said "Can't do it". Something about brake lights, as I recall - might be the same situation as yours.
Bill