GM Service Manual Online
For 1990-2009 cars only

To setup a new radio for the vehicle, complete the setup procedure under the Special Functions menu of the scan tool.

If the new radio is not properly setup, the radio will display a locked message (LOC) or Calibrate.

Important: The radio setup will configure the following systems:

   â€¢ LEARN VIN
   â€¢ Diagnostic Trouble Codes
   â€¢ Class 2 Radio Messages
   â€¢ Country Code
   â€¢ Chime Volume
   â€¢ Chime Level
   â€¢ 12/24 Hour Clock
Without learning the VIN, the radio will display a locked message (LOC).

The radio setup procedure will also clear the following messages:

   â€¢ CAL
   â€¢ CAL ERR
   â€¢ CALIBRATE