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 top.
4. Pull the old bulb straight out of the bulb socket.
5. Push the new bulb straight into the bulb socket until it clicks.
6. Push the bulb socket into the lamp assembly and turn it clockwise to lock it into place.
Chevrolet Cobalt Service & Repair Manual. Headlamp Alignment, Adjust
Visual Aim
Headlamp aim should be inspected
when a new headlamp capsule is installed, or if service or repairs to the
front end area have, or may have, disturbed the headlamps or their mounting.
The area should consist of a level
surface large enough to allow for a v ...