In my latest project/video - I go over on how to add factory bluetooth to your Sierra/Silverado.
You will need the VCIM computer out of a 2009 TrailBlazer to swap into your car. You will also need the Bluetooth Anttena that attaches to the VCIM .
You will need to remove the top of the dash to get to the VCIM box, and fabricate your own bracket to mount it to the dash.
Plug everything in - and you will be good to go.
2009 Trailblazer VCIM Box: 20830941
Bluetooth Antenna: 15938939 http://amzn.to/2sRXHEP
Aluminum Sheet Metal for adapter bracket.
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