Headlamp Control Unit, Basic Function - GF82.10-S-9890A

Model All (Light transporter) 

with code L45 (Multibeam LED with high beam assist plus) 

Model All (Light transporter) 

with code LG2 (LED Intelligent Light System) 

Model All (Light transporter) 

with code LG7 (LED high-performance headlamps) 

Overview 

This document contains the following information:

• General 
• Function 
  • Static LED headlamps 
  • Dynamic LED headlamp 

Example illustration of headlamp control unit 

Courtesy of MERCEDES-BENZ USA

General 

The headlamp control units are connected to the vehicle's network architecture. It operates in master-slave combination As the master the left headlamp control unit synchronizes the right headlamp control unit.

Function 

Static LED headlamps 

The static LED headlamps are equipped with LED matrices which consist of a multiple-chamber reflector system with 4 individual reflectors for the high beam and low beam.

The headlamp control units actuate the following functions:

• Daytime running lamps
• Position lights
• Turn signal lamp
• High beams and headlamp flasher output
• Automatic headlamp range control (HRA) (left headlamp control unit only) (except Canada version and USA version with static LED headlamps, right-hand traffic)
• Thermal management (temperature monitoring)

To implement the exterior lighting functions, the headlamp control units process, among others, the following information:

• Variant coding
• Circuit status
• Engine running signal (vehicles with combustion engine).
• Drivetrain operational signal
• Vehicle level
• Temperatures in the front lamp units
• Light function request

The headlamp control units process these input factors and send, among others, the following information:

• Status of light functions
• "Show display messages" request.

Dynamic LED headlamp 

The dynamic LED headlamps are equipped with LED matrices. These are equipped with several LEDs that can be actuated independently of one other. Based on which LEDs are actuated, the shape and, depending on the version of the LED headlamps, the intensity of the light cone can be influenced.

The headlamp control units actuate the following functions:

• Daytime running lamps
• Position lights
• Turn signal lamp
• High beams and headlamp flasher output
• Automatic headlamp range control (HRA) (left headlamp control unit only) (except Canada version and USA version with static LED headlamps right-hand traffic)
• Variable light distribution
  • Town light
  • Country light and curve illumination
  • Motorway light
  • Enhanced fog light function (depending on equipment)
• Cornering illumination
• Thermal management (temperature monitoring)

To implement the exterior lighting functions, the headlamp control units process, among others, the following information:

• Variant coding
• Circuit status
• Engine running signal (vehicles with combustion engine).
• Drivetrain operational signal
• Vehicle level
• Temperatures in the front lamp units
• Light function request
• Freeze frame data
• Object information for automatic high beam

The headlamp control units process these input factors and send, among others, the following information:

• Requests for high beam light distribution
• Light distribution status
• Status of light functions
• "Show display messages" request.