I have been looking at all the threads about installing a new head unit without changing the factory amp & sub.I cant seem to find a definite answer about losing the factory sub if I install a new head unit.According to crutchfield,bestbuy,& circuit city they all said I would lose my sub.When I went to my local stereo shop they said they can do it & I wont lose my sub.They want $500.00 including radio pioneer FHP800BT.I have done quite a few stereos in my time but never on a Lexus. I no how to take the old one out & I am confident I can make the radio fit.I am going with a double din size. I no somebody here has done this successfully can someone please give me some advice.All I need to no is how to wire the radio to the sub amp.By the way I have the pioneer system.

 

Nobody needs to reply.I figured it out with a little help from my friends.I went to my local stereo shop and I bought a one inch pocket filler and a wiring harness that plugged right into the harness on the car ( PLUG A) and that solved the all the speakers and the amp. now for the sub and the sub amp we just spliced into the wires that were in (PLUG D) and with a little luck and patience we got it to work. This is the link for the wiring http://www.intellexual.net/faq/lexusstereo.swf
And this is what the wiring harness looks like(scroll down)
http://www.autotoys.com/x/product.php?productid=1334