Chevrolet 2007 Colorado Owner's Manual page 105

Battery Replacement
Under normal use, the battery in your RKE
transmitter should last about two years.
The battery is weak if the transmitter will not work
at the normal range in any location. If you have
to get close to your vehicle before the transmitter
works, it is 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:
1. Insert a thin coin, or similar object, in the slot
between the covers of the transmitter housing.
Gently pry the transmitter apart.
2. Remove and replace the battery with a
three-volt CR2032 or equivalent battery.
3. Align the covers and snap them together.
4. Check the operation of the transmitter.
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