Review on Chevy Classic Impala Malibu Monte Carlo Oldsmobile Alero Cutlass Intrigue Pontiac Grand Ignition Lock Cylinder with Keys - Passlock Chip | OEM # 25832354 D1493F 15822350 US286l 12458191 924-719 by Farhad Cantu

so after installing the cylinder you will need to relearn a new lock chip by leaving the key in the on position until the security light stops flashing and turning the key off for five seconds and then try to start, learning usually takes three times. If you have trouble after installing the cylinder, check to see if the safety light is flashing. If it stays constant, three pins on the chip may be bent and not making contact. I press where the lock linkage enters the body so it stays level as the cylinder is inserted. works perfectly.