Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
It goes like this:30 Minute Learn ProcedureTurn ON the ignition, with the engine OFF.Attempt to start the engine, then release the key to ON (vehicle will not start).Observe the SECURITY telltale, after approximately 10 minutes the telltale will turn OFF.Turn OFF the ignition, and wait 5 seconds .Repeat steps 1 through 4 two more times for a total of 3 cycles/30 minutes (the vehicle is now ready to relearn the Passlock(TM) Sensor Data Code and/or passwords on the next ignition switch transition from OFF to CRANK).Start the engine (the vehicle has now learned the Passlock(TM) Sensor Data Code and/or password).
You should NOT have to do this, IF you have Programmed or Dealer has Programmed already.You can also try:Be sure Battery is fully chargedKey OFF & outAll Doors & Hood is shutLeave Vehicle "UNDISTURBED" for at least 14 minutesUnlock Driver DoorStart vehicle.
IF NONE of the above work, please take Vehicle to a GM Dealer that knows what they are doing