metra tyto 01 problems in is250

So Im trying to install my aftermarket double din into my 2006 IS250 and bought the Metra TYTO-01. I thought it would be a simple install but I ran into problems. First when I follow the metra guide, my DD powers up and plays perfectly but since Im plugging the metra module to the 20pin lexus harness, there are only two harnesses going into my CD changer and makes my climate controls not work. When I unplug the module and plug all three harnesses into the CD changer, my climate controls work perfectly. So I thought instead of plugging my metra harness to my lexus harness, I could plug the three lexus harnesses to my CD changer then tap my metra harness to it while its plugged into my CD changer. But now both dont work. If I unplug my metra module my climate controls work fine. anyone know whats wrong?

So I called Metra and asked them what was wrong and the said it wont work with my car. I questioned why the manual says that it works with the is250 and he simply said "I dont know". Depressing but does anyone know how to install my dd into my car?