I have a 2012 Terrain with all the bells and whistles, remote start etc. I lost the audio portion of my Navigation system about 6 months ago. Took it to the dealer he said the only thing that might make it work is a whole new radio for 1,500 after I already spent 600 on the service call. I even activated Onstar to see if that would work but nothing. The radio works great listen to Sirius all the time. I asked them to try a knew SD card but they said they couldn't do that as everyone of those is made specifically for that model. I'm calling BS on that one as my car did not have the card when I bought it. I bought one online and it has worked fine until recently. The Nav gives me directions bit just no turn by turn commands. So I am forced to use WAZE or Google. I would love to use the Onstar system since it is so simple to use.