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

Model 205 

up to model year 2019 

with code 631 (Static LED headlamps, left-hand traffic) 

Model 205 

up to model year 2019 

with code 632 (Headlamps, LED, static, right-side traffic) 

Model 205 

up to model year 2019 

with code 640 (High-performance LED) 

Model 205 

up to model year 2019 

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

Model 205 

up to model year 2019 

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

Model 253 (except 253.99) 

up to model year 2020 

with code 631 (Static LED headlamps, left-hand traffic) 

Model 253 (except 253.99) 

up to model year 2020 

with code 632 (Headlamps, LED, static, right-side traffic) 

Model 253 (except 253.99) 

up to model year 2020 

with code 640 (High-performance LED) 

Model 253 (except 253.99) 

up to model year 2020 

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

Model 253 (except 253.99) 

up to model year 2020 

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

Note on headlamp range adjustment 

The headlamp range adjustment is installed in vehicles that do not have any of the following equipment features:

Vehicle with LED headlamps (static) 

• Code 460 (Canada version)
• Code 494 (USA version)
• Air suspension (model 205 with CODE 483 (ADVANCED AGILITY package) and CODE 489 (AIRmatic), model 253 with CODE 489 (AIR BODY CONTROL))

Vehicle with LED headlamps (dynamic) 

• Air suspension (model 205 with CODE 483 (ADVANCED AGILITY package) and CODE 489 (AIRmatic), model 253 with CODE 489 (AIR BODY CONTROL))

Courtesy of MERCEDES-BENZ USA

Shown on front lamp unit with CODE 640 (High-performance LED) or CODE 641 (Dynamic left-hand traffic LED headlamp) or CODE 642 (Dynamic right-hand traffic LED headlamp), model 205 

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.

Tasks 

The headlamp control units work in a master/slave combination and communicate with each other via the peripherals 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:

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

Reading in of sensors and signals 

The input factors are read in via the following connections:

• Direct line (headlamp-internal) 
• LIN (headlamp-internal) (with CODE 640 (High-performance LED) or CODE 641 (Dynamic left-hand traffic LED headlamp) or CODE 642 (Dynamic right-hand traffic LED headlamp)) 
• Peripherals CAN 

Direct line (headlamp-internal) 

The left headlamp control unit reads in the signals of the following components via direct lines:

• Left rear level sensor (B22/7) (Headlamp range adjustment, vehicle with LED headlamps)
• Left front level sensor (B22/8) (Headlamp range adjustment, vehicle with LED headlamps (dynamic))
• Left active curve lights position sensor (E1b1) (with CODE 640 (High-performance LED) or CODE 641 (Dynamic left-hand traffic LED headlamp) or CODE 642 (Dynamic right-hand traffic LED headlamp))
• Left light distribution position sensor (E1b2) (with CODE 640 (High-performance LED) or CODE 641 (Dynamic left-hand traffic LED headlamp) or CODE 642 (Dynamic right-hand traffic LED headlamp))

The right headlamp control unit reads in the signals of the following components via direct lines:

• Right active curve lights position sensor (E2b1) (with CODE 640 (High-performance LED) or CODE 641 (Dynamic left-hand traffic LED headlamp) or CODE 642 (Dynamic right-hand traffic LED headlamp))
• Right light distribution position sensor (E2b2) (with CODE 640 (High-performance LED) or CODE 641 (Dynamic left-hand traffic LED headlamp) or CODE 642 (Dynamic right-hand traffic LED headlamp))

LIN (headlamp-internal) (with CODE 640 (High-performance LED) or CODE 641 (Dynamic left-hand traffic LED headlamp) or CODE 642 (Dynamic right-hand traffic LED headlamp)) 

The left headlamp control unit reads in the diagnostic data from the left front actuation module, LED exterior lighting (E1n7) 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 (E2n7) via the right headlamp LIN (LIN G2).

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
• Automatic headlamp range adjustment (HRA) (with code 631 (Static LED headlamps for left-hand traffic) or code 632 (Static LED headlamps for right-hand traffic) and except code 460 (Canada version) and except code 494 (USA version), with code 640 (High Performance LED) or code 641 (Dynamic LED headlamps for left-hand traffic) or code 642 (Dynamic LED headlamps for right-hand traffic))
• Standing/parking lights
• Cornering lights (with CODE 640 (High-performance LED) or CODE 641 (Dynamic left-hand traffic LED headlamp) or CODE 642 (Dynamic right-hand traffic LED headlamp))
• Intelligent Light System (with CODE 640 (High-performance LED) or CODE 641 (Dynamic left-hand traffic LED headlamp) or CODE 642 (Dynamic right-hand traffic LED headlamp))
• Adaptive Highbeam Assist (with CODE 640 (High-performance LED) or CODE 641 (Dynamic left-hand traffic LED headlamp) or CODE 642 (Dynamic right-hand traffic LED headlamp))

Actuation of components 

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

• Direct line (headlamp-internal) 
• LIN (with CODE 640 (High-performance LED) or CODE 641 (Dynamic left-hand traffic LED headlamp) or CODE 642 (Dynamic right-hand traffic LED headlamp)) 

Direct line (headlamp-internal) 

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

With CODE 631 (Static left-hand traffic LED headlamp) or CODE 632 (Static right-hand traffic LED headlamp):

• Left high beam (E1e1)
• Left low beam (E1e2)
• Left front turn signal light (E1e5) (model 205)
• Left parking light, standing light and daytime running light (E1e13) (model 205)
• Left position light, daytime running light and turn signal light (E1e25) (model 253)
• Left headlamp range adjustment actuator motor (E1m1) (except CODE 460 (Canada version) and except CODE 494 (USA version))

With CODE 640 (High-performance LED) or CODE 641 (Dynamic left-hand traffic LED headlamp) or CODE 642 (Dynamic right-hand traffic LED headlamp):

• Left front turn signal light (model 205)
• Left front side marker light (E1e6) (with CODE 460 (Canada version) or CODE 494 (USA version))
• Left cornering light (E1e9)
• Left parking light, standing light and daytime running light (model 205)
• Left front ambient light (E1e23) (model 205 with code 641 (Dynamic left-hand traffic LED headlamp) or code 642 (Dynamic right-hand traffic LED headlamp))
• Left position light, daytime running light and turn signal light (model 253 (except ECE vehicles))
• Left position light, daytime running light, turn signal light and ambient light (E1e26) (model 253, ECE vehicles)
• Left headlamp range adjustment actuator motor
• Left active curve illumination actuator motor (E1m2)
• Left light distribution actuator motor (E1m3)
• Fan motor 1 for left front lamp unit (E1m4)

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

With CODE 631 (Static left-hand traffic LED headlamp) or CODE 632 (Static right-hand traffic LED headlamp):

• Right high beam (E2e1)
• Right low beam (E2e2)
• Right front turn signal light (E2e5) (model 205)
• Right parking light, standing light and daytime running light (E2e13) (model 205)
• Right position light, daytime running light and turn signal light (E2e25) (model 253)
• Right headlamp range adjustment actuator motor (E2m1) (except CODE 460 (Canada version) and except CODE 494 (USA version))

With CODE 640 (High-performance LED) or CODE 641 (Dynamic left-hand traffic LED headlamp) or CODE 642 (Dynamic right-hand traffic LED headlamp):

• Right front turn signal light (model 205)
• Right front side marker light (E2e6) (with code 460 (Canada version) or code 494 (USA version))
• Right cornering light (E2e9)
• Right parking light, standing light and daytime running light (model 205)
• Right front ambient light (E2e23) (model 205 with code 641 (Dynamic left-hand traffic LED headlamp) or code 642 (Dynamic right-hand traffic LED headlamp))
• Right position light, daytime running light and turn signal light (model 253 (except ECE vehicles))
• Right position light, daytime running light, turn signal light and ambient light (E2e26) (model 253, ECE vehicles)
• Right headlamp range adjustment actuator motor
• Right active curve illumination actuator motor (E2m2)
• Right light distribution actuator motor (E2m3)
• Fan motor 1 for right front lamp unit (E2m4)

LIN (with CODE 640 (High-performance LED) or CODE 641 (Dynamic left-hand traffic LED headlamp) or CODE 642 (Dynamic right-hand traffic LED headlamp)) 

The left headlamp control unit communicates via the left headlamp LIN with the left front actuation module, LED exterior lighting.

The right headlamp control unit communicates via the right headlamp LIN with the right front actuation module, LED exterior lighting.

The functions that use these signals are described in the individual function descriptions (see the appropriate block diagram or function schematic).

	Exterior lights wiring diagram	Model 205 up to model year 2019, model 253 (except model 253.99) up to model year 2020, with code 631/632 (Lamp unit) E1	PE82.10-P-2000-97FBF
		Model 205 up to model year 2019, model 253 (except model 253.99) up to model year 2020, with code 631/632 (Lamp unit) E2	PE82.10-P-2000-97FBG
		Model 205 up to model year 2019 with code 640/641/642 (Lamp unit) E1	PE82.10-P-2000-97FBC
		Model 205 up to model year 2019 with code 640/641/642 (Lamp unit) E2	PE82.10-P-2000-97FBD
		Model 253 (except model 253.99) up to model year 2020, with code 640/641/642 (Lamp unit) E1	PE82.10-P-2000-97FBH
		Model 253 (except model 253.99) up to model year 2020, with code 640/641/642 (Lamp unit) E2	PE82.10-P-2000-97FBI