GM Service Manual Online
For 1990-2009 cars only

Use the scan tool to erase the DTCs in the memory.

Verify the proper system operation and the absence of the DTCs when the clearing procedure is completed.

The EVO/Passlockā„¢ module will not permit DTC clearing until all the DTCs have been displayed. Also, the DTCs do not clear by unplugging the EVO/Passlockā„¢ module, disconnecting the battery cables, or turning the ignition to the OFF position.