I have a 2015 Silverado has been e problems with the Onstar and Gps. I replaced the gps antenna as recommend by searching on the internet. After replacing the antenna the dps still does not work. I have no lights on my interior mirror. Is there a fuse to power that? I guess the next thing to replace would be the hmi module? Just not sure what to do.

 

Check for fault codes. Also knowing if you have rpo codes UE1, CV3, I06, I05, and or I04 would be helpful.

 

my rpo codes i have are ue1 and 106