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

Model 166 

as of Model year 2016 

with CODE 640 (High-performance LED) 

Model 166 

as of Model year 2016 

with CODE 641 (Headlamps, LED, dynamic, left-side traffic) 

Model 166 

as of Model year 2016 

with CODE 642 (Headlamps, LED, dynamic, right-side traffic) 

Model 292 

with CODE 640 (High-performance LED) 

Model 292 

with CODE 641 (Headlamps, LED, dynamic, left-side traffic) 

Model 292 

with CODE 642 (Headlamps, LED, dynamic, right-side traffic) 

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) 

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.

Tasks 

The headlamp control units operate in a master-slave combination and they communicate with each other over the 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 signals 
• Evaluation of input factors 
• Controlling functions 
• Actuation of components 

Reading in of signals 

The input factors are read in via the following connections:

• Direct line (inside headlamp) (with CODE 640 (High Performance LED) or CODE 641 (Dynamic left-hand traffic LED headlamp) or CODE 642 (Dynamic right-hand traffic LED headlamp)) 
• Local Interconnect Network (LIN) (inside headlamp) (with CODE 640 (High Performance LED) or CODE 641 (Dynamic left-hand traffic LED headlamp) or CODE 642 (Dynamic right-hand traffic LED headlamp) 
• Chassis CAN 2 

Direct line (inside headlamp) (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 following components are read in by the left headlamp control unit via a direct line:

• Left active curve lights position sensor (E1b1)
• Left light distribution position sensor (E1b2)

The following components are read in by the right headlamp control unit via a direct line:

• Right active curve lights position sensor (E2b1)
• Right light distribution position sensor (E2b2)

Local Interconnect Network (LIN) (inside headlamp) (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 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)

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 (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 [LWR])
• Standing/parking lights
• Cornering illumination
• 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 

Components are actuated with the following connection:

• Direct line (headlamp-internal) 
• Local Interconnect Network (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 a direct line:

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 (E1e5)
• Left front side marker lamp (E1e6) (with CODE 460 (Canada version) or CODE 494 (USA version))
• Left cornering light (E1e9)
• Left parking light, standing light and daytime running light (E1e13)
• Left front ambient light (E1e23) (with CODE 641 (Dynamic left-hand traffic LED headlamp) or CODE 642 (Dynamic right-hand traffic LED headlamp))
• Left headlamp range adjustment actuator motor (E1m1)
• 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 a direct line:

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 (E2e5)
• 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 (E2e13)
• Right front ambient light (E2e23) (with CODE 641 (Dynamic left-hand traffic LED headlamp) or CODE 642 (Dynamic right-hand traffic LED headlamp))
• Right headlamp range adjustment actuator motor (E2m1)
• Right active curve illumination actuator motor (E2m2)
• Right light distribution actuator motor (E2m3)
• Fan motor 1 for right front lamp unit (E2m4)

Local Interconnect Network (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 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		PE82.10-P-2000-97NBA
			PE82.10-P-2000-97NBC