Owner's Manual
Page 118
...check period of the oil life has been used and each time the engine is started after that your alternator and battery charging systems are working. If the "Change Oil Soon" light is on for at once.... After 5 seconds, the "Change Oil Soon" light will stay on continuously, there is a problem with the Oil Life Monitor System and service is in for 60 seconds once 90% of three seconds. It... will flash 4 times and then go off all accessories and set your Buick to OFF. This will come on , you need service and you get there, turn the key...
...check period of the oil life has been used and each time the engine is started after that your alternator and battery charging systems are working. If the "Change Oil Soon" light is on for at once.... After 5 seconds, the "Change Oil Soon" light will stay on continuously, there is a problem with the Oil Life Monitor System and service is in for 60 seconds once 90% of three seconds. It... will flash 4 times and then go off all accessories and set your Buick to OFF. This will come on , you need service and you get there, turn the key...