Headlights, sidelights, reversing lights, interior lights, engine compartment lights, trunk lights, glove box lights, license plate lights, open door lights, fog lights, turn signals - this is far from a complete list,
Naturally, each of them has a specific purpose and it is necessary to ensure that none of the devices is idle.
Remember: Incorrectly adjusted headlights blind oncoming drivers and do not provide good illumination of the road surface.
A young, inexperienced car enthusiast can drive for a long time with such headlights, believing that everything is fine.
There are a number of factors that affect the position of the headlights: tire pressure, the condition of the coil springs of the front suspension, the difference in spring force between the front and rear suspensions. These factors are variable, so the position of the headlights must be constantly checked and adjusted if necessary.
(The original source is located on the website VAZBOOK.RU)
The headlights are adjusted by placing the car on a level surface. The tires must have normal pressure. For this operation, you need a screwdriver and a special screen, which is easy to make yourself on a wall, plywood or cardboard sheet. The screen is marked depending on the car model (see the "Car Operating Instructions"). The headlights of VAZ-2101, VAZ-2102, VAZ-21011 cars are adjusted on one screen. One screen for both VAZ-2103 and VAZ-2106. Cars must have their own screens VAZ-2121, VAZ-2105 and VAZ-2107.
All other lighting and signaling devices are checked by inspection, preferably by two people, since, while sitting in the car, it is difficult to see what is happening behind, in front or on the side, where the lighting and signaling devices are located.