If your vehicle has power door locks, it will have this feature. If you press the power door lock switch when the key is in the ignition and any door is open, all the doors will lock and the driver's door will unlock.
Be sure to remove the key from the ignition when locking your vehicle.
The lockout protection can be overridden by pressing and holding the power door lock in the lock position for three seconds.
Rear Door Security Locks (Sedan)
TrunkChevrolet Cobalt Owners Manual. Setting the Clock
Without Date Display
AM/FM Base Radio with a Single CD Player
To set the time:
1. Turn the ignition key to ACC/ACCESSORY or
ON/RUN. Press O to turn the
radio on.
2. Press until the hour
begins flashing on the
display. Press a second time
and the minute
begins flashing on the display.
...