1. Make sure that the OnStar module is plugged in, in the port in between the black USB and XM port. 2. Try Steering wheel controls and see if voice commands still work. 3. Make sure bluetooth still works. (If so, it's proof that OnStar is working.)
If you were having issues with GPS after an install (specifically latency). You may have been provided a specific splitter to install that will require you to know where the OnStar Module is located. The first picture is for the SRX 2013-2016 The ...
If you have a 2018+ Chrysler, Dodge, Ram or Jeep Vehicle, you will need to temporarily install a Security Bypass Module: https://www.infotainment.com/products/fca-security-gateway-module-bypass The security bypass module is plugged into the ...