First of all, I live in Korea, so it just might be a different situation here. I read howellm70's post from here, and thought about giving up installing heated steering wheel. But by then I had already bought heated steering wheel from ebay so I just had to find a way to install it. I finally found a guy who works on BMW electronics like alarm, and remote keys. I paid him $300, and according to him, he made a single module for heating control, and it just works find on my car. And it just work fine on my car. Well, one downside is that I gave up voice command button on steering wheel to use it as turn off button. Heating control button only turns on the heat.

I think if there is a technician who knows about electronics and module work, it will be a easy job.