Component description for Xenon headlamp control unit - GF82.10-P-2114GV

MODEL 251.0/1 with CODE (614) Bi-xenon headlamp unit with CODE (618) Bi-xenon headlamps as of model year 2011/YoM 10 model refinement package

Fig 1: Identifying Xenon Headlamp Control Unit Component

Courtesy of MERCEDES-BENZ USA

Location

One Xenon headlamp control unit is located on the inside of the left front lamp unit and the inside of the right front lamp unit respectively. The xenon headlamp control units are screwed to the housings of the front lamp units. The xenon headlamp control units are connected to the vehicle-side wiring harness via the lamp units.

Task

The xenon headlamp control units work in a master/slave combination and communicate with each other via the engine compartment CAN (CAN-C). As master the xenon headlamp control unit at the left front lamp unit synchronizes the xenon headlamp control unit at the right front lamp unit. The xenon headlamp 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
Engine compartment CAN

Direct line

In vehicles without code (488) Steel/air suspension and without code (489) AIRmatic (air suspension with level adjustment and adaptive damping system ADS), the signals of the following sensors are read in by the xenon headlamp control unit at the left front lamp unit via a direct line:

Right front level sensor (B22/9)
Right rear level sensor (B22/10)

Engine compartment CAN

The signals are read in by the xenon headlamp control units via the engine compartment 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 that have been read in are evaluated by the integrated microprocessor and the relevant components are then actuated.

Control of functions

The following functions are realized by actuating the appropriate components:

Low beam
High beam and headlamp flasher
Automatic headlamp range adjustment (HRA [LWR])

Actuation of components

Components are actuated with the following connection:

Direct line

Direct line

The following components are actuated by the xenon headlamp control unit at the left front lamp unit:

Left bi-xenon light with integrated ignition module (E1e10)
Left headlamp range adjustment motor (E1m1)

The following components are actuated by the xenon headlamp control unit at the right front lamp unit:

Bi-xenon light with integrated ignition module (E2e10)
Right headlamp range adjustment motor (E2m1)

Wiring diagram for front signal acquisition and actuation module (SAM) control unit

Specification 4

PE54.21-P-2114-97RAD