Buick 2002 LeSabre Owner's Manual page 78

For battery replacement, use one Duracell
-
type DL 2032, or a similar type.
To replace the battery, do the following:
1. Insert a coin, or similar object, into the notch near
the key ring. Turn it counterclockwise to separate the
two halves of the transmitter.
2. Once the transmitter is separated, use a pencil eraser
to remove the old battery. Do not use a metal object.
3. Remove and replace the battery. Replace it as the
instructions inside the cover indicate.
4. Snap the transmitter back together tightly to be
sure no moisture can enter.
5. Check the operation of the transmitter.
R
battery,
2-15