From my experience in doing this to my 2008 CTS, if you don't care about OnStar, then any VCIM with the same ports will be fine. You would just lose OnStar. If you want to retain it you would need a used VCIM. Otherwise the if you buy a brand new one it must first be installed in a newer vehicle (where Bluetooth was factory-installed) to be "activated" and then it will be possible for the dealer to program it to your own vehicle.
It has a separate antenna that you will need to purchase if it does not come with it. At least this was the case on my CTS VCIM bluetooth upgrade, and someone here installed a CTS VCIM in their Escalade so that tells me you will need it as well.
Found a couple for a reasonable price, one is a LG out of a sonic, pic only shows one coax plug, no antenna visible or included, another one a Continental out of a camero, has 3 coax with external antenna in one of them, either one will work?
I am 99% sure the Continental one does not have Bluetooth. All the Bluetooth ones I've seen are LG and have one coax plug excluding the antenna port. The Continental one I removed from my CTS that was not Bluetooth sounds exactly like the one you described.
Hm. So it must be the other way around, the LG one from the Sonic probably does not have Bluetooth. There should be a Bluetooth logo on the sticker on the Continental one (although the external antenna is a clear indication). Can you post a pic of the VCIM with its ports visible?
Well I bought the continental, it has a Bluetooth logo on the sticker and a antenna, even with the antenna plugged in there is still 2 open coax connectors. It was installed in a 2010 camero. Once it shows up I will report if it works.
Well I did the swap tonight, everything went smooth, took 15 minutes tops, lots of good info on here had me prepared. Turns out my original vcim is a continental as well. All the plugs matched up, there were no left over plugs or cables, both the blue and purple antennae cables plugged in. Fit the bracket perfectly.
When I press the voice button on my steering wheel and say "Onstar" it replies "onstar call" then voice recognition shuts off.
I will do some more research but I think it is not looking good. Anybody have any hints?