HEY, check the IS300 forum, imma upload some pics =)
I finnaly figured this beyacth out!!!
For my car there's 2 speed sensor wire. At first it was hooked up at the bottom, and didn't work. After reading up, I took it off, cuz most ppl on this forum says it's not really needed. In any case, I hooked it up to a different sensor wire and its totally functional now.
The antenna under the dash is totally fine.