Chevrolet 2003 Monte Carlo Owner's Manual page 72

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Insert a flat object like a coin into the slot on the
back
of
the transmitter. Gently pry apart the front
and back.
Gently pry the battery out
o f
the transmitter. Do not
use a metal object.
Put the new battery into the transmitter as shown
on the transmitter. Use type CR2032 battery or
equivalent.
Put the two halves back together. Make sure the
halves are together tightly so water won't get in.
Resynchronize and then test the transmitter.
Resynchronization
Notice' When the battery, use care not to After you have changed the battery in your transmitter,
touch any of the circuitry. Static from your body
transferred to these surfaces may damage the
transmitter.
you will need to resynchronize the transmitter. To
do this, press the LOCK and UNLOCK buttons on the
transmitter at the same time and hold for approximately
seven seconds or until one horn chirp is heard.
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