I have just got back from the dealership had to show my ID and registration to get this info. Anyhow your onstar module is located behind your ash tray and to totally make it where it has no signal you have to unplug it via the wire harness and unplug the antenna. Now the antenna wire is nothing other than a data cord so you cant use it for an antenna, but your rear defroster can be used as a antenna. The data cord can be plugged into an after market gps this way you dont have to run extra wires. To clarify the rumors that fuse (47) will disable the onstar unit is false, all it does is kill the power to your mirror. Further more disabling onstar does nothing to the rest of your truck. Now when getting to the module there are no screws (do not take appart the top portion of your dash it is not necessary to do this) the ceter secion is held on by H clips on the bottom just pull. You can get up under there and look so you dont break the clips the rest of it just pops off after the H clips are undone. Hope this helps.

(this info was provided by a sevice tech at the GM dealer)

 

cool !! i like it......

 

I removed the OnStar box in my 2007 Silverado new body style and it threw a bunch of codes on the computer. the ABS light came on and it says service four wheel drive. What is wrong???