Front LED Matrix Headlamp Unit Control Unit, Component Description - GF82.10-P-2025FR

Model 257, 290 

up to model year 2021 

with code P35 (Light Package) 

Shown on model 257 

Courtesy of MERCEDES-BENZ USA

Location 

The front lamp unit LED matrix control units are located on the bottom of the respective front lamp unit.

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

Tasks 

The front lamp units are equipped with a new "multibeam technology". The light sources for implementing the high beams function are each equipped with 84 LEDs that can be actuated independently of each other. Depending on which LEDs are actuated, a light cone with different shape and intensity is formed.

The left front LED matrix lamp unit control unit controls the light distribution of the left front adaptive high beam (E1e24). The right front LED matrix lamp unit control unit controls the light distribution of the right front adaptive high beam (E2e24).

The left front lamp unit LED matrix control unit also controls the power supply of the left low beam (E1e2). The right front lamp unit LED matrix control unit controls the power supply of the right low beam (E2e2).

The following tasks result for the front LED matrix lamp unit control units:

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

Reading in of sensors and signals 

The input factors are read in via the following connections:

• Direct line 
• Periphery CAN (CAN PER) 

Direct line 

The left front LED matrix lamp unit control unit directly reads in the signals of the temperature sensors in the left front lamp unit.

The right front LED matrix lamp unit control unit directly reads in the signals of the temperature sensors in the right front lamp unit.

Peripherals CAN 

The front lamp unit LED matrix control units read in various status information and requests via the periphery CAN. This includes the following:

• Terminal status of terminal 15
• "Switch on low beams" request
• "Switch on high beams" request
• Object information, Adaptive Highbeam Assist
• Status of intelligent headlamp control (Intelligent Light System)
• "Light distribution" request, intelligent headlamp control (Intelligent Light System)
• Request to switch on the fan motor 2 for the left front lamp unit (E1m5) or the fan motor 2 for the right front lamp unit (E2m5)

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 front LED matrix lamp unit control units control the following functions:

• Low beam
• High beam
• Thermal management (temperature monitoring and fan control) The front lamp units have temperature sensors that are used to sense the heat development in the areas actuated by the LEDs.

The front lamp unit LED matrix control units evaluate the signals of the temperature sensors. If the LEDs or plastic housings of the front lamp units threaten to overheat as a consequence of high outside temperatures or high actuation currents, the front lamp unit LED matrix control units reduce the actuation currents of the LEDs and thereby lower the heat development. The front lamp units are also ventilated. The active ventilation is also used at the same time for thawing or deicing at low outside temperatures.

Actuation of components 

The left front LED matrix lamp unit control unit actuates the following components via direct lines:

• Left low beams
• Left front adaptive high beam
• Left front lamp unit fan motor 2

The right front LED matrix lamp unit control unit actuates the following components via direct lines:

• Right low beams
• Right front adaptive high beam
• Right front lamp unit fan motor 2

Transmitting signals 

The front LED matrix lamp unit control units send status information on the low beams and high beams via the periphery CAN to the left headlamp control unit (E1n9) as the front exterior lights master control unit.

	Exterior lights wiring diagram	Model 257, 290 up to model year 2021 with code P35 (Light Package)	PE82.10-P-2000-97XBC
		Model 257, 290 up to model year 2021 with code P35 (Light Package)	PE82.10-P-2000-97XBD