Chevrolet Malibu 2007 Malibu Owner's Manual page 103

To replace the battery in the remote keyless entry
transmitter do the following:
1. Insert a flat object, with a thin edge, into the
notch located below the vehicle locator/panic
alarm button, and 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 up. Use one three-volt,
CR2032, or equivalent type battery.
3. Put the two halves back together. Make sure
the cover is on tight, so water will not get
inside the transmitter.
4. Test the operation of the transmitter with the
vehicle.
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