Pontiac 1997 Grand Am Owner's Manual page 64

Battery Replacement
Under normal use, the battery in your key chain
transmitter should last about two years.
You can tell the battery is weak if the transmitter won't
work at the normal range in any location. If you have to
get close to your vehicle before the transmitter works,
it's probably time to change the battery.
NOTICE:
When replacing the battery, use care not to touch
any of the circuitry. Static from your body
transferred to these surfaces may damage
the transmitter.
To replace the battery in the Keyless Entry System:
1. Use a small coin or flathead screwdriver to separate
the bottom half from the top half of the transmitter.
2.
3.
4.
Remove the battery and replace it with the new one,
Make sure the positive. (+) side of the battery faces
down. Use one 3 volt, CR2032, or equivalent,
type battery.
Put the two halves back together. Make sure the
cover is on tightly, so water won't get in.
Check the operation of the transmitter with your
vehicle. If the transmitter does not work, try
synchronizing the transmitter with the receiver.
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