Headlamp: Description and Operation

GF82.10-P-2119GD Xenon Light Control Unit, Component Description
- with CODE (615) Bi-xenon headlamp unit with integrated curve illumination
- with CODE (621) Intelligent Light System (left-hand traffic)
- with CODE (622) Intelligent Light System (right-hand traffic)

Component Identification:

Location
There is one xenon light control unit on the underside of the left front lamp unit and one on the underside of the right front lamp unit. The xenon light control units are tightly screwed to the housings of the front lamp units. The xenon light control units are connected to the vehicle-side wiring harness via the front lamp units.

Task
The xenon light control units work in a master/slave combination and communicate with each other via the front end CAN (CAN G). As the master the left xenon light control unit synchronizes the right xenon light control unit. The xenon light control units have the following tasks:
^ Reading in of sensors, pickups and signals
^ Evaluation of input factors
^ Control of functions
^ Actuation of components

Reading in of sensors, pickups and signals
The input factors are read in via the following connections:
^ Direct line
^ Front end CAN (CAN G)

Direct line
The signals from the following sensors are read in by the left xenon light control unit via a direct line:
- Left rear level sensor (B22/7)
- Left front level sensor (B22/8)

Front end CAN
The signals are read in by the xenon light control units via the front end CAN.
The functions resulting therefrom are described in the corresponding function descriptions (see block diagram or function schematic).

Evaluation of input factors
The input factors are evaluated by the integrated microprocessors and the relevant components are then actuated.

Control of functions

The following functions are realized by actuating the appropriate components:
- Low beams power control
- Automatic headlamp range adjustment (HRA [LWR])
- Turning lamps
- Active curve illumination
(with code (615) Bi-xenon headlamp unit with integrated curve illumination or code (621) Intelligent light system (left-hand traffic) or code (622) Intelligent light system (right -hand traffic))
- Active light distribution (for code (621) Intelligent light system (left-hand traffic) or code (622) Intelligent light system (right- hand traffic))

Actuation of components

Components are actuated with the following lines:
^ Direct line
^ Left headlamp LIN (LIN G1)
^ Right headlamp LIN (LIN G2)

Direct line
The left xenon light control unit actuates the following components via a direct line:
- Left cornering light (E1e9)
- Left headlamp range adjustment actuator motor (E1m1)
- Left active curve illumination actuator motor (E1m2)

The right xenon light control unit actuates the following components via a direct line:
- Right cornering light (E2e9)
- Right headlamp range adjustment actuator motor (E2m1)
- Right active curve illumination actuator motor (E2m2)

Left headlamp LIN
The left xenon light control unit actuates the following component via the left headlamp LIN:
- Left xenon light power supply module (E1n4)

Right headlamp LIN
The right xenon light control unit actuates the following component the right headlamp LIN:
- Right xenon light power supply module (E2n4)