Oldsmobile 1999 Alero - Manual (Page 71)

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To replace the battery in the remote lock
control transmitter:
1. Use a small coin or flathead screwdriver to separate
the bottom half from the top half of the transmitter.
2. Remove the battery and replace it with the new one.
Make sure the positive (+) side of the battery faces
down. Use one three
- volt, CR2032, or equivalent,
type battery.
3. Put the two halves back together. Make sure the
cover is on tightly, so water won’t get in.
4. Resynchronize and then test the transmitter.
Resynchronization
Your keyless entry system is equipped with a security
system that prevents anyone from recording and
playing back your signal. The transmitter does not send
the same signal twice to the receiver. The receiver will
not respond to a signal that has been sent to it more
than once.
To resynchronize your transmitter and receiver, follow
these directions:
1. Stand close to your vehicle.
2. Press and hold the LOCK and UNLOCK buttons on
the transmitter at the same time.
3. Hold the buttons for five seconds. In this time, the
doors should lock and unlock once. This confirms
the resynchronization. If the doors do not lock and
unlock, see your dealer for service.