To replace one of these bulbs: 1. Open the trunk.
2. Remove the trunk trim and pull back fastener.
3. Remove the additional fastener.
4. Remove the outer two screws from the taillamp assembly.
5. Lift up on the tab and pull the wiring harness straight out.
6. Remove the taillamp assembly from the quarter panel.

A. Sidemarker
B. Stoplamp/Turn Signal/Taillamp
C. Back-up
7. Turn the bulb socket counterclockwise and pull it straight out.
8. Pull the old bulb straight out of the socket.
9. Push the new bulb straight into the socket.
10. Push the new bulb into the taillamp assembly and turn it clockwise to lock it into place.
11. Reinstall the taillamp assembly into the quarter panel.
12. Push the wiring harness straight into the taillamp assembly and push the tab down.
13. Reinstall the outer two screws into the taillamp assembly.
14. Reinstall the trunk trim and the fasteners.
Taillamps and Turn Signal Lamps (Coupe)
Back-Up Lamps (Coupe)Chevrolet Cobalt Owners Manual. Door Locks
To lock the driver door from outside the vehicle, turn the
key clockwise. Turn it counterclockwise to unlock.
The Remote Keyless Entry (RKE) transmitter can also
be used to lock or unlock the doors.
From the inside, use the manual lock knobs on each
door or use the power door locks.
Power Door ...