A:AnswerShould work fine with any speaker setup but double check with installers you might have to get special adapters for your speakers. As far as Onstar is concerned you should contact them and let them know what your doing they should be able to help you figure it out.
A:AnswerI haven't been able to use anything, yet, because it hasn't been installed. I had an appointment but it was cancelled due to the pandemic. However, I was told by the Best Buy Geek Squad installer that there was not an acceptable interface for this head unit. The installer is the best there is, and I believe him. So, no, steering wheel controls probably can't be connected.
