Headlamp control unit, component description - GF82.10-P-2020CAM

MODEL 207.3/4 as of model year 2014

Without code (640) SAE dynamic LED headlamp for right-hand traffic and without code (641) Dynamic LED headlamp for left-hand traffic and without code (642) Dynamic LED headlamp for right-hand traffic

Fig 1: Identifying Headlamp Control Unit Components - Without Code (640)

Courtesy of MERCEDES-BENZ USA

With code (640) SAE dynamic LED headlamp for right-hand traffic or code (641) Dynamic LED headlamp for left-hand traffic or code (642) Dynamic LED headlamp for right-hand traffic

Fig 2: Identifying Headlamp Control Unit Components - With Code (640)

Courtesy of MERCEDES-BENZ USA

Location

The left headlamp control unit is arranged at the bottom of the left front lamp unit.

The right headlamp control unit is arranged at the bottom of the right front lamp unit.

The headlamp control units are tightly screwed to the housing of the respective front lamp units. The headlamp control units are connected to the vehicle-side wiring harness via the front lamp units.

Task

The headlamp control units work in a master/slave combination and communicate with one another via chassis CAN 2 (CAN E2).

As the master, the left headlamp control unit synchronizes the right headlamp control unit.

The headlamp control units have the following tasks:

Reading in of sensors, pickups and signals
Evaluation of input factors
Controlling functions
Actuation of components

Reading in of sensors, pickups and signals

The input factors are read in via the following connections:

LIN (with code (640) SAE dynamic LED headlamp for right-hand traffic or code (641) Dynamic LED headlamp for left-hand traffic or code (642) Dynamic LED headlamp for right-hand traffic)
Chassis CAN 2

LIN (with code (640) SAE dynamic LED headlamp for right-hand traffic or code (641) Dynamic LED headlamp for left-hand traffic or code (642) Dynamic LED headlamp for right-hand traffic)

The left headlamp control unit reads in the diagnostic data from the left front actuation module, LED exterior lighting via the left headlamp LIN (LIN G1).

The right headlamp control unit reads in the diagnostic data from the right front actuation module, LED exterior lighting via the right headlamp LIN (LIN G2).

Chassis CAN 2

The signals are read in by the headlamp control unit via chassis CAN 2.

The functions that use these signals are described in the individual function descriptions.

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.

Controlling functions

The headlamp control unit actuates the following functions:

Low beam
High beam and headlamp flasher
Automatic headlamp range adjustment (HRA [LWR])
Cornering illumination
Active curve illumination
Active light distribution (with code (641) Dynamic LED headlamp for left-hand traffic or code (642) Dynamic LED headlamp for right-hand traffic)

Actuation of components

The actuation of the components takes place via the following connections:

Direct line
LIN

Direct line

On vehicles without code (640) SAE dynamic LED headlamp for right-hand traffic and without code (641) SAE dynamic LED headlamp for left-hand traffic and without code (642) Dynamic LED headlamp for right-hand traffic, the left headlamp control unit actuates the following components over direct lines:

Left low beam (E1e2)
Left front side marker lamp (E1e6) (with code (460) Canada version or code (494) USA version)
Left parking light and daytime running light (E1e13)
Left headlamp range adjustment actuator motor (E1m1)
Fan motor 1 for left front lamp unit (E1m4)

On vehicles without code (640) SAE dynamic LED headlamp for right-hand traffic and without code (641) SAE dynamic LED headlamp for left-hand traffic and without code (642) Dynamic LED headlamp for right-hand traffic, the right headlamp control unit actuates the following components over direct lines:

Right low beam (E2e2)
Right front side marker lamp (E2e6) (with code (460) Canada version or code (494) USA version)
Right parking light and daytime running light (E2e13)
Right headlamp range adjustment actuator motor (E2m1)
Fan motor 1 for right front lamp unit (E2m4)

On vehicles with code (640) SAE dynamic LED headlamp for right-hand traffic or code (641) SAE dynamic LED headlamp for left-hand traffic or code (642) Dynamic LED headlamp for right-hand traffic, the left headlamp control unit actuates the following components over direct lines:

Left cornering light (E1e9)
Left turn signal light, parking light, side marker lamp and daytime running light (E1e18)
Left headlamp range adjustment actuator motor
Left active curve illumination actuator motor (E1m2)
Left light distribution actuator motor (E1m3)
Left front lamp unit fan motor 1

On vehicles with code (640) SAE dynamic LED headlamp for right-hand traffic or code (641) SAE dynamic LED headlamp for left-hand traffic or code (642) Dynamic LED headlamp for right-hand traffic, the right headlamp control unit actuates the following components over direct lines:

Right cornering light (E2e9)
Right turn signal light, parking light, side marker lamp and daytime running light (E2e18)
Right headlamp range adjustment actuator motor
Right active curve illumination actuator motor (E2m2)
Right light distribution actuator motor (E2m3)
Right front lamp unit fan motor 1

LIN (with code (640) SAE dynamic LED headlamp for right-hand traffic or code (641) Dynamic LED headlamp for left-hand traffic or code (642) Dynamic LED headlamp for right-hand traffic)

The left headlamp control unit actuates the left front exterior lights LED actuation module over the left headlamp LIN.

The right headlamp control unit actuates the right front exterior lights LED actuation module over the right headlamp LIN.

Exterior lights wiring diagram	MODEL 207.3/4 as of model year 2014 without CODE 641 (Headlamps, LED, dynamic, left-side traffic) without CODE 642 (Headlamps, LED, dynamic, right-side traffic) E1, E2	PE82.10-P-2000-97EAC
Exterior lights wiring diagram	MODEL 207.3/4 as of model year 2014 with CODE 641 (Headlamps, LED, dynamic, left-side traffic) E1MODEL 207.3/4 as of model year 2014 with CODE 642 (Headlamps, LED, dynamic, right-side traffic) E1	PE82.10-P-2000-97EAD
Exterior lights wiring diagram	MODEL 207.3/4 as of model year 2014 with CODE 641 (Headlamps, LED, dynamic, left-side traffic) E2MODEL 207.3/4 as of model year 2014 with CODE 642 (Headlamps, LED, dynamic, right-side traffic) E2	PE82.10-P-2000-97EAE