The vehicle has a battery saver feature designed to protect the vehicle's battery.
When any interior lamp is left on and the ignition is turned off, the battery rundown protection system automatically turns the lamp off after 20 minutes.
This prevents draining of the battery.
Electric Power Management
Accessory Power Outlet(s)Chevrolet Cobalt Service & Repair Manual. Rear Side Marker Lamp Bulb, Replace
Coupe
1.
Remove rear side marker lamp.
2.
Rotate rear side marker lamp bulb socket
(1) counterclockwise and remove from lamp housing, Fig.
1.
3.
Remove rear side marker lamp bulb (2),
Fig. 1.
...