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Headlamp Control, Function - GF82.10-P-2009GNA

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) 

Function requirements, general 

Driving lights actuation, general 

Driving lights actuation includes all functions which serve the optimum illumination of the road while driving.

The driving lights actuation function is comprised of the following subfunctions:

IMPORTANT The driving lights are actuated corresponding to the position of the exterior lights switch (S1). The SAM control unit (N10) reads in the status of the exterior lights switch directly.

Additional function requirements for low beams actuation 

IMPORTANT The electronic ignition lock control unit (N73) sends the status of circuit 15 via interior CAN (CAN B) to the SAM control unit.

IMPORTANT The standing lights are active during low beams actuation. The standing lights actuation is described in the separate document "Standing/parking lights actuation function".

Function sequence for low beam actuation 

Turning the exterior lights switch into the "low beams" position requests actuation of the low beams.

The SAM control unit reads in the status of the exterior lights switch directly and sends the "Low beams ON" request over the interior CAN and the electronic ignition lock control unit over the left headlamp control unit (E1n9) to the left front lamp unit (E1) and over the right headlamp control unit (E2n9) to the right front lamp unit (E2).

The left headlamp control unit sends the "Low beams ON" request over the left headlamp LIN (LIN G1) to the left front actuation module, LED exterior lighting (E1n7).

The left front actuation module, LED exterior lighting actuates the left low beam (short range) (E1e15) and the left low beam (long range) (E1e16) directly.

The right headlamp control unit sends the "Low beams ON" request over the right headlamp LIN (LIN G2) to the right front actuation module, LED exterior lighting (E2n7).

The right front actuation module, LED exterior lighting actuates the right low beam (short range) (E2e15) and the right low beam (long range) (E2e16) directly.

The SAM control unit also_sends the "Low beams indicator lamp ON" request over the interior CAN and the electronic ignition lock control unit to the instrument cluster (A1), which then actuates the low beams indicator_lamp (A1e67).

Additional function requirements for high beam actuation 

Function sequence for high beam actuation 

The high beams actuation function comprises the following subfunctions:

Function sequence for high beams 

High beam actuation is requested by pushing the combination switch (S4) forward.

The steering column tube module control unit (N80) directly reads in the position of the combination switch and sends this via chassis CAN 1 (CAN E1), electronic ignition lock control unit and interior CAN to the SAM control unit.

The SAM control unit sends the "High beams ON" request over the interior CAN, electronic ignition lock control unit and chassis CAN 2 to the headlamp control units.

The left headlamp control unit sends the "High beams ON" request over the left headlamp LIN to the left front actuation module, LED exterior lighting. The left front actuation module, LED exterior lighting directly actuates the left high beam.

The right headlamp control unit sends the "High beams ON" request over the right headlamp LIN to the right front actuation module, LED exterior lighting. The right front actuation module, LED exterior lighting directly actuates the right high beam.

The SAM control unit also sends the "High beams ON" status over the interior CAN to the instrument cluster, which then actuates the high beam indicator lamp (A1e3).

Function sequence for headlamp flasher 

The function sequence and signal path for the headlamp flasher function correspond to that of the high beam function. However, to request the headlamp flasher function, the combination switch must be pulled backward.

IMPORTANT If the combination switch is pulled back and held, the high beam actuation is active for maximum t = 30 s. The permanently present request is then interpreted as a "stuck combination switch".

Additional function requirements for daytime running lights actuation 

Function sequence for daytime running lights actuation 

The SAM control unit reads in all the relevant information, evaluates it and sends the "Daytime running lights ON" request for vehicles without CODE 498 Japan version over the interior CAN, electronic ignition lock control unit and chassis CAN 2 to the headlamp control units.

IMPORTANT In vehicles with CODE 498 (Japan version), low beam actuation is activated instead of the daytime running lights.

The left headlamp control unit actuates the daytime running lights in the left parking light, standing light and daytime running light (E1e13). The right headlamp control unit actuates the daytime running lights in the right parking light, standing light and daytime running light (E2e13).

IMPORTANT In vehicles with CODE 460 (Canada version), the daytime running light actuation is switched off after expiration of a time interval of t = 3 min when the vehicle is standing still. When the vehicle then starts to move again, the SAM control unit automatically activates daytime running lights actuation.

IMPORTANT In darkness, the SAM control unit activates the auto on/off driving lights.

Additional function requirements for auto on/off driving lights 

IMPORTANT The CDI control unit or the ME-SFI [ME] control unit transmits the "Engine running" or "Drive train operational" signal via chassis CAN 1, the electronic ignition lock control unit and the interior CAN to the SAM control unit.

The instrument cluster sends the vehicle speed to the SAM control unit over the interior CAN.

The SAM control unit reads in the status of the exterior lights switch directly.

Function sequence for auto on/off driving lights 

With the auto on/off driving lights, the low beams are automatically switched on or off.

The auto on/off driving lights are purely a comfort function and do not relieve the driver of the need to follow the operating instructions as prescribed by the road traffic regulations.

Behavior of exterior lights when the auto on/off driving lights are active     
Start of trip  Standing lamp  Low beam 
Circuit 15 C OFF OFF OFF
Circuit 15 C ON OFF OFF
Circuit 15 R On ON OFF
Circuit 15 ON ON OFF
"Engine running" signal or "Drive train ready" signal set or v > 3 km/h ON On (high beams permissible)
End of trip  Standing lamp  Low beam 
"Engine running" signal or "Drive train ready" signal set or v > 3 km/h ON On (high beams permissible)
Circuit 15 R On ON OFF
Circuit 15C ON (driver door closed) ON OFF
Circuit 15C ON (driver door open) OFF OFF
Circuit 15 C OFF OFF OFF

The low beams are switched on or off depending on the ambient brightness or depending on the activities of the windshield wiper system:

Function sequence for auto on/off driving lights over the rain/light sensor with additional functions 

The rain/light sensor with additional functions evaluates the ambient brightness. The SAM control unit reads in the signals of the rain/light sensor with additional functions over the roof LIN and activates the low beams actuation if darkness is recognized.

IMPORTANT In the event of any failure in the rain/light sensor with additional functions, the auto on/off driving lights are not deactivated until the engine is switched off.

When the vehicle is being driven through a tunnel and if the wiper suppression function is active, the auto on/off driving lights remains switched on.

Function sequence for auto on/off driving lights over wiper activities 

If the low beams are switched on or off due to the activities of the windshield wiper system, one refers to wiper, rain or adverse weather light. The SAM control unit controls the windshield wiper system and evaluates the signals of the rain/light sensor with additional functions or the wipe request through the combination switch for this purpose. If the windshield washer system is activated for t ≥ 20 s with a wipe cycle time of t < 6 s, the SAM control unit activates low beams actuation. If there are no wipe cycles for t ≥ 60 s, low beams actuation is deactivated.

IMPORTANT If the wiper suppression function is canceled, the auto on/off driving lights remain active for an additional t = 60 s.

Additional function requirement for automatic headlamp range adjustment (HRA [LWR]) 

Function sequence for automatic headlamp range adjustment (HRA [LWR]) 

The automatic HRA [LWR] corrects the headlamp range of the vehicle headlamps in accordance with the load or the vehicle pitch motions induced by the vehicle dynamics.

Determining vehicle level:

On vehicles without CODE 489 (AIRMATIC) :

On vehicles with CODE 489 (AIRMATIC) :

The AIRMATIC control unit (N51/3) sends all data required for evaluation of the vehicle level via chassis CAN 1, electronic ignition lock control unit and chassis CAN 2 to the headlamp control units. The AIRmatic control unit evaluates the signals from the following components for this:

IMPORTANT Zero-point programming is performed at the end of production to compensate for suspension tolerances. Upon successful programming, there is a visual feedback through a movement of the headlamp units "Center-bottom-top-center" and "Center-outside-center" (with CODE 640 (High Performance LED) or CODE 641 (Dynamic left-hand traffic LED headlamp) or CODE 642 (Dynamic right-hand traffic LED headlamp)). This reference sequence always takes place after a change of circuit 30 L status, i.e. after bus idle.

If the vehicle is moving at a constant speed, the automatic headlamp range adjustment system operates in "static mode" at a slow adjustment rate. When the vehicle is accelerated, the "dynamic mode" is activated and the reaction time of the automatic headlamp range adjustment is significantly reduced. Depending on the speed change and additional signals such as brake pedal and accelerator pedal position, the "dynamic mode" is activated.

IMPORTANT When the vehicle is standing automatic headlamp range adjustment is accomplished in the "dynamic mode".

The headlamp control units operate in a in master-slave combination, whereby the left headlamp control unit acts as the master and synchronizes the right headlamp control unit.

The left headlamp control unit actuates the left headlamp range adjustment actuator motor (E1m1) directly.

The right headlamp control unit actuates the right headlamp range adjustment actuator motor (E2m1) directly.

  Electrical function schematic for driving lights actuation   PE82.10-P-2059-97NBB
  Overview of exterior lights system components   GF82.10-P-9998GN 
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