Chevrolet TRACKER 2002 Owner's Manual page 76

Operation
LOCK: All doors will automatically lock when the LOCK
button on the transmitter is pressed. On convertible to
vehicles equipped with this system, the tailgate will need
to be manually locked and unlocked.
UNLOCK: The driver's door will unlock automatically
when the UNLOCK button on the transmitter is pressed.
If the UNLOCK button is pressed again within
five seconds, all remaining doors will be unlocked. On
convertible top vehicles equipped with this system, the
tailgate will need to be manually locked and unlocked.
The following functions are
available with the remote
keyless entry system:
Matching Transmitter(s) to Your Vehicle
Each remote keyless entry transmitter is coded to
prevent another transmitter from unlocking your vehicle.
If a transmitter is lost or stolen, a replacement can be
purchased through your dealer. Remember to bring
any remaining transmitters with you when you go to
your dealer. When the dealer matches the replacement
transmitter to your vehicle, any remaining transmitters
must also be matched. Once your dealer has coded the
new transmitter, the lost transmitter will not unlock
your vehicle. Each vehicle can have a maximum of
two transmitters matched to it.
2-11