I didn't want to go through every step if nobody is interested. I upgraded (replaced) a 2007 VCIM basic, and replaced it with a new 2010 W/BT. It installed with no problems under the dual lighters between the center console and dash. After I installed I had to set the device up using techlink...
I read through these posts and sounds like it could be several things, but more point me to this issue that I resolved a few months ago.
Have your dealer look up this TSB # up for your vehicle
Here are the number TSB Number: SB-08-07-30-021 NHTSA Number: 10025668
Loss of high speed gmlan...
VCIM Swap
I have upgraded several VCIM upgrades. One was an upgrade from 7.0 to 8.1 that enabled NAV traffic. There are some tricks that you have to know before you can get your onstar working for calls and NAV traffic. If you are interested in knowing how reply to this message and I will...
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