The lamps inside the vehicle will go on when any door is opened. These lamps fade out about 20 seconds after all of the doors have been closed or when the ignition is turned to ON/RUN. These lamps will also go on when pressing the trunk release, unlock symbol, or the horn symbol button on the Remote Keyless Entry System (RKE) Transmitter.
After the key is removed from the ignition, the lamps inside the vehicle stay on for about 20 seconds to provide an illuminated exit.
Dome Lamp
Mirror Reading LampsChevrolet Cobalt Owners Manual. Back-Up Lamps (Coupe)
To replace a back-up lamp bulb:
1. Open the trunk. See Trunk.
2. Locate the back-up lamp bulb assembly in the
trunk lid.
3. Turn the bulb socket counterclockwise and pull it
out of the lamp assembly.
On vehicles that have a back-up lamp cover, first
remove it by pressing the tab at the to ...