Cadillac 1999 Eldorado Owner's Manual page 64

1. Use the round end of the door key or a coin to pry
open the transmitter.
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2. Once the transmitter is separated, use a pencil (or
similar object) to remove the old battery. Do not use
a metal object.
3. Remove and replace the battery. Insert the new
battery as the instructions under the cover indicate.
Do not use a metal object.
4. Snap the transmitter back together tightly to be sure
no moisture can enter.
5. Resynchronize the transmitter. See instructions under
"Resynchronization" following.
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