OnStar - Cellular Telephone Setup - With RPO U45

The following procedure disables the normal hands-free cellular telephone voice recognition, and allows the CommuniportPC voice recognition to take effect.
1. Connect a scan tool to the data link connector (DLC).
2. Turn ON the ignition, with the engine off.
3. Under the cellular telephone (PHN) main menu, select Special Functions.
4. Under the Special Functions menu, select Phone Steering Wheel Controls.
5. A screen appears titled Setting Options. This screen gives the instructions for the procedure. After reading the instructions, press DONE to proceed to the next screen (where you actually perform the procedure).
6. The screen that appears is titled Phone Steering Wheel Controls. It has one line available, Disable Phone Steering Wheel Controls.
7. Pressing ENTER toggles an asterisk (*) ON or OFF next to the Disable Phone Steering Wheel Controls line. If the vehicle has CommuniportPC (U45), turn ON this line (marked with *) in order to disable the normal cellular telephone voice recognition.
8. Pressing SAVE OPTIONS leads back to the Special Functions menu.
9. Exit the scan tool PHN menu.

"For a description of the RPO Code(s) shown in this article or any of the images therein, refer to the RPO Code List found at Vehicle/Application ID". RPO Codes