Chevrolet 2002 Malibu Owner's Manual page 75

Operation
(Lock): All doors will automatically lock when this
button on the transmitter is pressed. The interior lamps
will turn off after all of the doors are closed. If all of
the doors are closed when the transmitter lock button
is pressed, the parking lamps will flash twice and the
horn will chirp (if the horn chirp feature is enabled) to
indicate locking has occurred.
2-12
The following functions
are available with the
keyless entry system:
(Unlock): The driver's door will unlock
automatically when this button on the transmitter is
pressed. If the button is pressed again within five
seconds, all remaining doors will unlock. The interior
lamps will stay on for 10 seconds or until the ignition is
turned on. The parking lamps will flash twice to indicate
unlocking has occurred.
(Remote Trunk Release): The trunk will unlock
when the vehicle symbol on the transmitter is pressed, as
long as the trunk lockout is not engaged. See "Remote
Trunk Release Lockout" in the Index. You can open the
trunk with the transmitter when ignition is on with the
shift lever in PARK (P), or when the ignition is off.
The interior lamps will come on for 10 seconds or
until the ignition switch is turned to ON.
(Horn): The horn will sound and the headlamps
and the parking lamps will flash for up to two minutes
when the horn symbol on the transmitter is pressed.
The interior lamps will come on and remain on while
the horn is sounding and the lamps are flashing. The
horn and lamps can be turned off by pressing the horn
symbol button again or by turning the ignition to ON.