Crutchfield Master Sheet 2006- HHR
 

I've posted this before but since it's been a while figured I'd do it again for those that want it. It shows you how to remove the factory head unit and speakers for the panel and regular HHR with and without the Pioneer system. It's in PDF format.

http://www.filedropper.com/hhrcrutchfieldmastersheet

Make sure you click Download this file about half way down and not the green Download button.