I pulled my passenger seat out earlier to clean up the carpet a little from stains made by the PO. Out of curiosity, I went ahead and pulled the nav DVD player up to access the amp. I unplugged the amp fully and while I had no sound (as you would expect) my climate control still worked fine. Everything I've read has said that unplugging the amp would cause the integrated climate controls not to work so I'm a little confused. Right now it seems like I would be fine to replace the JBL amp with an aftermarket unit without any side effects. ??