General information
In accordance with European standards, these cars are necessarily equipped with a system for automatically adjusting the headlight beams in a vertical plane depending on the height of the body and headlight washers.
Attention! It is forbidden to install headlights equipped with xenon lamps on models that are not designed for such systems.
Xenon lamps
These bulbs do not have a filament. Light radiation in such lamps is generated by two electrodes enclosed in a quartz flask containing compressed gas (xenon). The electronic unit built into the headlight is powered by a car battery (12 V) and generates first a voltage of 20,000 V, necessary for ignition, and then an alternating voltage of 85 V to maintain its glow.
Automatic headlight beam adjustment depending on body height
The automatic headlight leveling system must support (when changing the vehicle load) constant angle of inclination of the light beam by comparison with the original value set at the factory or at a service station.
This system can be diagnosed using diagnostic tools.
Each time a fault is cleared from the memory of the electronic unit, the actuators move down.
Description
The system includes:
- two headlights equipped with a conventional position lamp A, a high beam lamp type H1 B, a xenon low beam lamp C type D2R and an orange direction indicator lamp D;
- two electronic units built into headlights E (one per headlight);
- rear height sensor F, located on the left side of the vehicle underbody. It fixes the height of the body and issues a corresponding signal to the sensor / ECU;
- front sensor/ECU G, registers the height of the front of the body. The ECU adjusts the headlights depending on the change in body height when accelerating, braking or changing the vehicle load;
- two special headlight adjustment H actuators mounted on the rear side of each headlight unit.
Note: The vehicle speed signal is used to change the angle of the light beam at high speed.