Thanks for sharing rtgree,
I'm going to get my hans on the canusb device and give your software a try. I ended up using a module that allowed me to tap into the canbus somewhat, all it really does is turn on the factory amp and give me line level input. I would like to take an approach more similiar to what you have done, I know there is a lot the canbus does in these vehicles, and some of the multiplexed circuits can be hardware hacked with resistors, but I would prefer to just have a read/write canbus networking solution like you have done. So I guess this all starts by getting the canusb followed by a lot of reading.