Headlamp Control Unit, Component Description - GF82.10-P-2020LF

Model 217

Model 222

except code 640 (SAE dynamic LED headlamps, right-hand traffic)

except code 641 (Dynamic LED headlamps, left-hand traffic)

except code 642 (Dynamic LED headlamps, right-hand traffic)

Model 222 up to model year 2018 with code 640 (SAE dynamic LED headlamps, right-hand traffic)

Model 222 up to model year 2018 with code 641 (Dynamic LED headlamps, left-hand traffic)

Model 222 up to model year 2018 with code 642 (Dynamic LED headlamps, right-hand traffic)

Left front lamp unit (E1) with code 640 (dynamic SAE right-hand traffic LED headlamp) or code 641 (dynamic left-hand traffic LED headlamp) or code 642 (dynamic right-hand traffic LED headlamp) shown

Fig 1: Headlamp Control Unit Component Location - Model 217 (Shown With Code 640, 641 Or 642)

Courtesy of MERCEDES-BENZ USA

Location

The left headlamp control unit is located on the left front lamp unit and the right headlamp control unit is located on 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 wiring harness on the vehicle side via the respective front lamp unit.

Task

The headlamp control units work in a master/slave combination and communicate with each other via the periphery CAN (CAN PER). As the master, the left headlamp control unit synchronizes the right headlamp control unit.

The headlamp control units have the following tasks:

Read in sensors and signals
Evaluation of input factors
Controlling functions
Actuation of components

Read in sensors and signals

The input factors are read in via the following connections:

Direct line (in headlamp) (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))
LIN (in headlamp) (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))
Peripherals CAN

Direct line (in headlamp) (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 signals of the following components are read in by the left headlamp control unit via direct lines:

Left active curve lights position sensor (E1b1)
Left light distribution position sensor (E1b2) (with code 641 (dynamic LED headlamp for left-hand traffic) or code 642 (dynamic LED headlamp for right-hand traffic))
Left headlamp range adjustment actuator motor (E1m1)
Left active curve illumination actuator motor (E1m2)
Left light distribution actuator motor (E1m3) (with code 641 (dynamic LED headlamp for left-hand traffic) or code 642 (dynamic LED headlamp for right-hand traffic))
Fan motor 1 for left front lamp unit (E1m4)

The signals of the following components are read in by the right headlamp control unit via direct lines:

Right active curve lights position sensor (E2b1)
Right light distribution position sensor (E2b2) (with code 641 (dynamic LED headlamp for left-hand traffic) or code 642 (dynamic LED headlamp for right-hand traffic))
Right headlamp range adjustment actuator motor (E2m1)
Right active curve illumination actuator motor (E2m2)
Right light distribution actuator motor (E2m3) (with code 641 (dynamic LED headlamp for left-hand traffic) or code 642 (dynamic LED headlamp for right-hand traffic))
Fan motor 1 for right front lamp unit (E2m4)

LIN (in headlamp) (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 following information is read in by the left headlamp control unit via left headlamp LIN (LIN G1):

Diagnostic data from the left front actuation module, LED exterior lighting (E1n7)

The following information is read in by the right headlamp control unit via right headlamp LIN (LIN G2):

Diagnostic data from the right front actuation module, LED exterior lighting (E2n7)

Peripherals CAN

The signals are read in by the headlamp control units via the periphery CAN.

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

Controlling functions

The following functions are realized by actuating the appropriate components:

Low beam
Turn signal lamp
High beam and headlamp flasher
Standing/parking lights
Cornering illumination
Intelligent Light System (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)
Adaptive Highbeam Assist (with code 608 (Adaptive Highbeam Assist) or code 628 (Adaptive Highbeam Assist Plus))
Infrared light (with code 610 (Night View Assist))

Actuation of components

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

Direct line (headlamp-internal)
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))

Direct line

The following components are actuated by the left headlamp control unit via direct lines:

Without code 640 (SAE dynamic LED headlamp for right-hand traffic), code 641 (dynamic LED headlamp for left-hand traffic) and code 642 (dynamic LED headlamp for right-hand traffic)):
- Left high beam (E1e1)
- Left low beam (E1e2)
- Left front turn signal lamp (E1e5)
- Left parking light, standing light and daytime running light (E1e13)
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)):
- Left front turn signal lamp
- Left front side marker lamp (E1e6) (with CODE 460 (Canada version) or CODE 494 (USA version))
- Left cornering light (E1e9)
- Left infrared light (E1e11) (with code 610 (Night View Assist))
- Left parking light, standing light and daytime running light
- Left headlamp range adjustment actuator motor
- Left active curve illumination actuator motor
- Left light distribution actuator motor (with code 641 (dynamic LED headlamp for left-hand traffic) or code 642 (dynamic LED headlamp for right-hand traffic))
- Left front lamp unit fan motor 1

The following components are actuated by the right headlamp control unit via direct lines:

Without code 640 (SAE dynamic LED headlamp for right-hand traffic), code 641 (dynamic LED headlamp for left-hand traffic) and code 642 (dynamic LED headlamp for right-hand traffic):
- Right high beam (E2e1)
- Right low beam (E2e2)
- Right front turn signal lights (E2e5)
- Right parking light, standing light and daytime running light (E2e13)
With code 640 (SAE dynamic LED headlamp for right-hand traffic), code 641 (dynamic LED headlamp for left-hand traffic) or code 642 (dynamic LED headlamp for right-hand traffic):
- Right front turn signal lamp
- Right front side marker lamp (E2e6) (with CODE 460 (Canada version) or CODE 494 (USA version))
- Right cornering light (E2e9)
- Right infrared light (E2e11) (with code 610 (Night View Assist))
- Right parking light, standing light and daytime running light
- Right headlamp range adjustment actuator motor
- Right active curve illumination actuator motor
- Right light distribution actuator motor (with code 641 (dynamic LED headlamp for left-hand traffic) or code 642 (dynamic LED headlamp for right-hand traffic))
- 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 following component is actuated by the left headlamp control unit via the left headlamp LIN:

Actuation module for left front exterior lights LED

The following component is actuated by the right headlamp control unit via the right headlamp LIN:

Actuation module for right front exterior lights LED

Exterior lights wiring diagram	Model 222 except code 640 (SAE dynamic LED headlamps, right-hand traffic) except code 641 (Dynamic LED headlamps, left-hand traffic) except code 642 (Dynamic LED headlamps, right-hand traffic) Headlamp unit E1	PE82.10-P-2000-97SEC
Exterior lights wiring diagram	Model 222 except code 640 (SAE dynamic LED headlamps, right-hand traffic) except code 641 (Dynamic LED headlamps, left-hand traffic) except code 642 (Dynamic LED headlamps, right-hand traffic) Headlamp unit E2	PE82.10-P-2000-97SED
Exterior lights wiring diagram	Model 217 Headlamp unit E1 Model 222 up to model year 2018 with code 640 (SAE dynamic LED headlamps, right-hand traffic) Headlamp unit E1 Model 222 up to model year 2018 with code 641 (Dynamic LED headlamps, left-hand traffic) Headlamp unit E1 Model 222 up to model year 2018 with code 642 (Dynamic LED headlamps, right-hand traffic) Headlamp unit E1	PE82.10-P-2000-97SEA
Exterior lights wiring diagram	Model 217 Headlamp unit E2 Model 222 up to model year 2018 with code 640 (SAE dynamic LED headlamps, right-hand traffic) Headlamp unit E2 Model 222 up to model year 2018 with code 641 (Dynamic LED headlamps, left-hand traffic) Headlamp unit E2 Model 222 up to model year 2018 with code 642 (Dynamic LED headlamps, right-hand traffic) Headlamp unit E2	PE82.10-P-2000-97SEB