http://www.autosoundcentral.com/Metr.../gmoslan03.htmTo add navigation wiring and Bluetooth I suggest this

 

If your speaking to me, I dont have the pioneer package, onstar, or steering wheel controls so none of that was needed. Had it installed for about a month or two and everything works properly with no problems.

 

I have the 2011 standard 6 speaker system, no pioneer premium sound. Just got an e-mail from the manufacturer who said if I can send them a copy of the wiring diagram and existing stereo pinouts they will have an Engineer review them and get back to me. I must say they have been extreemly responsive.

 

No you where not the op.....

 

Very good

 

This would explain the OEM head unit wiring I am having trouble matching to the harness I bought. It was off this thread that I decided to buy it, https://www.chevyhhr.net/forums/show...hlight=GM2500i

Your right though he doesn't mention having GPS in his Dual HU. I'll check it out and see if I can get it locally, I'm sure I can ebay the one I purchased. If not I'll wait until another weekend to install it.

I wasn't sure about the GMOS-LAN 03 since it isn't specifically recommended for a 2011 HHR, then again when I downloaded the manuals on all of the ones I've researched, none go beyond the 2010 HHR.

 

Thats what I figured but since yours was right after mine I wanted to make sure.

 

2011 and 2010 are same as all previous

 

So even though the latest year I see they reccomend for the GMOS~LAN~03 is 2007 you know it will work with the 2011?

 

Metra website has updated paperwork stating it works here ya go