I recently picked up a used 2005 Bose HU for $150 and a brand new OEM Sirius module for $170. Installed it last night and it works like a charm in my 04. It is nice to have factory integrated Sirius.

Everything seems to be working fine. This morning I noticed that my heater only has 2 temperatures now, full hot or full cold. I read that this might be a heater control module. Do you think this could be related to the used HU?