I'm going insane.. I'm trying to find the ACC wire for a remote start.. This wire should be hot in the ACC and ON position and cold in START position.. I've tested every wire in the ignition switch harness.. It's not the red or yellow wire as stated in the install manual and the pink/blue stated on the12volt.com does not exist in my ignition switch harness..

1 million points for whoever can tell me where the ACC wire is!

bump.. nobody knows?

Not sure if this helps but A3 on the HU is listed as ACC, i used it when hooking up my aftermarket headunit. Maybe you could tap into that wire.
http://www.intellexual.net/faq/lexusstereo.swf