On some vehicles, removing the fuses for the fan relays, fuel pump or other modules may be required to prevent these devices from turning on during the procedure. You do NOT want any loss of voltage during the procedure as this can really screw things up! GM does NOT approve using a battery charger, unless it is a GM-approved Midtronics charger (which delivers very consistent voltage with no fluctuations). Before you start the procedure, make sure the battery is fully charged.Connect your PC to the Tech 2 scan tool with a RS232 cable pass-through device.The software can then be copied from the CD through your PC to a flash card for the Tech 2 scan tool. You must first purchase a TIS subscription from GM, and then GM will mail you the calibration software on a CD. You can’t download the new calibration software from the website, however. If the PCM programming has been updated, the most recent calibration will be listed on the website. Check the calibration history of the vehicle - Go to the GM web page at to see what the latest vehicle calibration is for your car by entering the vehicle VIN number.The actual reprogramming procedure for a typical GM vehicle goes as follows:
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