Hi guys I been a lurker for awhile, I would like to do this mod as well, I have a 2007 Tohoe, I went to EBAY and car-parts but really aren't having any luck, I think there are 2 listed on car-parts (if I'm looking correctly) but neither show specifically the #20829984 module, one shows an Buick Enclave ID#20890999 from New York, the second says from a Chevy Traverse no ID# just says voice recognition from Oregon.
If anyone knows of a module for sure I would sure appreciate the heads up.
The information on forum is great!!
Your help would be appreciated
Thank You
The easiest way is to go on Onstar's website (link is in this thread) and look up their RemoteLink page and see what vehicle's are supported. If you have an 07, you do not want to get anything from a 2011 and up as the connections for GPS/Cell are in one cable instead of two. You would have to purchase a separate harness. I believe Bluetooth started in 09, and then if you find one that supports RemoteLink and is 09-10 you are golden. Mine is out of a 2010 Suburban and works perfectly. The only thing is that Onstar thinks I have a 2010 black Suburban with the corresponding vin. Also when you buy it, make sure it has the bluetooth antennae attached to it.
BTW. Love the RemoteLink app. Best damn thing ever! Love starting the car when in the locker room at the gym getting ready and walk out to a nice warm car.