Pontiac 2005 Grand Prix - Manual (Page 71)

Battery Replacement
Under normal use, the battery in the remote keyless
entry transmitter should last about four years.
If the battery is weak the transmitter will not work within
its normal range. It is probably time to change the
battery if you have to be very close to the vehicle before
the transmitter works.
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 do the following:
1. Insert a flat object with a thin edge into the notch,
located below the trunk release button, and pry the
front and back apart.
2. Remove the old battery, but do not use a metal
object to do this.
3. Slide the new battery into the transmitter with the
positive side of the battery facing up. Use a type
CR2032 battery, or equivalent type.
4. Snap the front and the back of the transmitter
together.
5. Test the operation of the transmitter with the
vehicle.
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