Disarming The System - Chevrolet 2010 Cobalt Owner's Manual

If you press the lock button on the transmitter a second
time while all the doors are closed, the system will arm
immediately. The system will still arm in 60 seconds if a
door is open. When the open door is closed, it will also
become armed.
The security light, located on the instrument panel
cluster, will turn on to indicate that arming has been
initiated. Once the system is armed, the security light
will flash once every three seconds.
If the security light is flashing twice per second, this
means that a door is open.
If you do not want to arm the system, you may lock the
car with the manual lock knobs, or the power door lock
switch, if equipped, on the doors.

Disarming the System

You can disarm the system by doing any one of
the following:
Press the remote keyless entry transmitter
unlock button.
Turn the ignition on.
If the system is armed and the trunk is opened using
the trunk release button on the transmitter, the system
will temporarily disarm itself and re arm when the trunk
has been closed. This allows you to exit the vehicle,
lock the doors using the transmitter, and open the
trunk using the transmitter without having to disarm
and re arm the system.
Once the system is disarmed, the security light will
stop flashing.
How the System Alarm is Activated
If the system is armed, it can be activated by either:
Opening the driver's door or trunk. This will
cause a ten second pre-alarm chirp followed by
a thirty second full alarm of horn and lights.
Opening any other door. This will immediately
cause a full alarm of horn and lights for
thirty seconds.
When an alarm event has finished, the system will
re-arm itself automatically.
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