Buick 1994 LeSabre Owner's Manual page 118

RUN position. It will stay on for 60 seconds once 90%
of the oil life has been used and each time the engine is
started after that. If the "Change Oil Soon" light is on
continuously, there is a problem with the Oil Life
Monitor System and service is required.
After changing the engine oil, the system should be
reset. This will cause the "Change Oil Soon" light to be
lit for a bulb check period of three seconds.
The reset button is in the glove box. With the ignition
key in the RUN position, push the reset button, hold it in
for at least 5 seconds but not more than 60 seconds.
After
5 seconds, the "Change Oil Soon" light
will flash
4 times and then go off. This indicates that the Oil Life
Monitor System has been reset.
Battery Light
I
VOLTS
I
When you turn the key to RUN, this light will come on
briefly, to show that your alternator and battery charging
systems are working.
If the light stays on, you need service and you should
take your Buick to the dealer at once. To save your
battery until you get there, turn off all accessories and
set your air system to OFF.
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