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Headlamp control, function - GF82.10-P-2009GMA

MODEL 164.1 as of model year 2009 without CODE 615 (Bi-xenon headlamp unit with integrated curve illumination) without CODE 616 (Bi-xenon headlamp unit with integrated asymmetric curve illumination) 

MODEL 164.8 as of model year 2009 up to model year 2010 without CODE 615 (Bi-xenon headlamp unit with integrated curve illumination) without CODE 616 (Bi-xenon headlamp unit with integrated asymmetric curve illumination) 

MODEL 164.8 as of model year 2010 without CODE 615 (Bi-xenon headlamp unit with integrated curve illumination) without CODE 616 (Bi-xenon headlamp unit with integrated asymmetric curve illumination) without CODE 621 (Intelligent Light System (left-hand traffic)) without CODE 622 (Intelligent Light System (right-hand traffic)) 

MODEL 251.0/1 as of model year 2009 up to model year 2011 without CODE 615 (Bi-xenon headlamp unit with integrated curve illumination) without CODE 616 (Bi-xenon headlamp unit with integrated asymmetric curve illumination) 

MODEL 251.0/1 as of model year 2011 without CODE 614 (Bi-xenon headlamp unit) without CODE 618 (Bi-xenon headlamps) 

Function requirements for driving lights actuation, general 

Driving lights actuation, general 

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

IMPORTANT The driving lights are actuated corresponding to the position of the rotary light switch (S1).

During driving lights actuation, the standing lights actuation is active; this is described in the separate "Standing/parking lights actuation, function" Service Information.

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

Additional function requirements for low beams actuation 

IMPORTANT The EZS control unit (N73) sends the status of circuit 15 via interior CAN (CAN B) to the front SAM control unit (N10).

Function sequence for low beam actuation 

Turning the rotary light switch to the "manual driving lights" position requests actuation of the low beams.

The upper control panel control unit (N72/1) reads in the status of the rotary light switch via the instrument panel LIN (LIN 1) and transmits this via interior CAN to the front SAM control unit. The front SAM control unit then directly actuates the left low beam (E1e2) in the left front lamp unit (E1) and the right low beam (E2e2) in the right front lamp unit (E2). On model 164 as of 1.7.09 and on model 251 as of 1.8.10, the front SAM control unit sends the "Low beams indicator lamp ON" request via interior CAN to the instrument cluster (A1). The instrument cluster then actuates the low beams indicator lamp (A1e67).

Additional function requirements for high beam actuation 

IMPORTANT The EZS control unit sends the status of circuit 15 via interior CAN to the front SAM control unit.

Function sequence for high beam actuation 

The high beams actuation is comprised of the following subfunctions:

Function sequence for high beams 

The high beam actuation is requested by pressing the combination switch (S4) forward.

The steering column tube module (N80) directly reads in the switch position of the combination switch and transmits this via engine compartment CAN (CAN C), central gateway control unit (N93) and interior CAN to the front SAM control unit. The front SAM control unit then actuates the left high beam (E1e1) as well as the right high beam (E2e1) directly and sends the status "High beam actuation active" via interior CAN to the instrument cluster. The instrument cluster 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. The high beams actuation remains active for as long as the combination switch is held in this position.

IMPORTANT On vehicles with code (460) Canada version or code (494) USA version and without code (236) Daytime running lights in LED design, the high beams must not be actuated at the same time as the left front fog lamp (E5/1) and right front fog lamp (E5/2). The last incoming request has priority.

Additional function requirements for daytime running lights actuation 

IMPORTANT The CDI control unit (N3/9) (with diesel engine) or the ME-SFI [ME] control unit (N3/10) (with gasoline engine) sends the engine speed and the status of circuit 61 via engine compartment CAN, central gateway control unit and interior CAN to the front SAM control unit.

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

The upper control panel control unit reads in the status of the rotary light switch over the instrument panel LIN and sends it over the interior CAN to the front SAM control unit.

Function sequence for daytime running lights actuation 

The request for the daytime running lights function is output depending on the country coding or activated manually by the instrument cluster via the interior CAN.

Model 164.1, model 251 up to 31.7.10, model 164.8 up to 30.6.09: 

The front SAM control unit reads in all of the relevant information and actuates the left low beam and the right low beam.

In vehicles with code (460) Canada version or code (494) USA version, the low beams are actuated in accordance with the ambient brightness. This is detected by the rain/light sensor (B38/2). The overhead control panel control unit (N70) reads in the signals of the rain/light sensor directly and forwards these via interior CAN to the front SAM control unit. If it is dark, the front SAM control unit actuates both the low beams and the standing lights. During the day the low beams are actuated at reduced power (U = 13.2 V). The standing lights are not actuated.

Model 164.1 as of 1.8.10 with code (236) Daytime running lights in LED design, model 164.8 as of 1.7.09, model 251 as of 1.8.10: 

The front SAM control unit reads in all of the relevant information and actuates the left daytime running lights headlamp (E1/3) or the right daytime running lights headlamp (E2/3) directly.

When it is dark and the rotary light switch is in the "AUTO" position, the front SAM control unit switches off the daytime running lights headlamps, and activates the low beam actuation.

For model 164.1 with code (460) Canada version or code (494) USA version the daytime running lights headlamps are also actuated in the dark along with the low beam actuation.

Daytime running lights actuation is deactivated as soon as the rotary light switch is moved to the "Standing lights" position or the "Manual driving lights" position.

For vehicles with code (460) Canada version or code (494) USA version, daytime running lights actuation is switched off when the vehicle is stationary after t = 3 min. When the vehicle then starts to move again, the front SAM control unit automatically activates daytime running lights actuation.

IMPORTANT The daytime running lights have a higher priority than the auto on/off headlamps. In countries with legal daytime running light requirements, only the headlamp flasher is permissible but not the high beams. The high beams are only permissible if the driving lights have been switched on manually via the rotary light switch (without code (460) Canada version or without code (494) USA version).

Additional function requirements for auto on/off headlamps 

IMPORTANT The CDI control unit or the ME-SFI [ME] control unit sends the engine speed or the status of circuit 61 via engine compartment CAN, central gateway control unit and interior CAN to the front SAM control unit.

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

The upper control panel control unit reads in the status of the rotary light switch over the instrument panel LIN and sends it over the interior CAN to the front SAM control unit.

Auto on/off headlamps function sequence 

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

The auto on/off headlamps function is no more than a comfort function and does not exempt the driver from following the rules in the road traffic regulations.

Behavior of exterior lights with active auto on/off headlamps: 
Start of trip  Standing lamp  Low beam 
Circuit 15C OFF Off Off
Circuit 15C ON Off Off
Circuit 15R ON On Off
Terminal 15 ON On Off
Engine running (n > 300 rpm) or circuit 61 On or vehicle speed v > 3 km/h On On (high beams permissible)
End of trip  Standing lamp  Low beam 
Engine running (n > 300 rpm) or circuit 61 On or vehicle speed v > 3 km/h On On (high beams permissible)
Circuit 15R ON On Off
Circuit 15C ON (driver door closed) On Off
Circuit 15C ON (driver door open) Off Off
Circuit 15C OFF Off Off

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

Function sequence for auto on/off headlamps over rain/light sensor 

The ambient brightness is sensed by the rain/light sensor. The overhead control panel control unit reads in the signals of the rain/light sensor directly and forwards these via interior CAN to the front SAM control unit. The front SAM control unit activates low beam actuation when it is dark.

IMPORTANT In the event of rain/light sensor failure, the auto on/off headlamps are not deactivated until the engine is switched off. When the vehicle is being driven through a tunnel and if the wiper start suppression function is active, the auto on/off headlamps function remains switched on.

Function sequence for auto on/off headlamps via wiper activities 

If the low beams are switched on or off due to the activities of the wiper system, one refers to adverse weather light. The front SAM control unit actuates the wiper system.

If the windshield wiper system is activated for t ≥ 20 s with a wipe cycle time of t < 6 s, the front SAM control unit activates low beam actuation. If there are no wipe cycles for t ≥ 60 s, low beams actuation is deactivated.

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

Additional function requirements for headlamp range adjustment 

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

The headlamp range adjustment is installed as passive safety equipment in vehicles fitted with halogen headlamps to prevent them from causing glare to oncoming traffic. Depending on the load condition of the vehicle, the incline angle of the driving lights can be corrected by actuating the headlamp range adjustment selector wheel (S1s8). The left headlamp range adjustment motor (E1m1) and the right headlamp range adjustment motor (E2m1) are actuated voltage-coded in accordance with the position of the headlamp range adjustment selector wheel. These then adjust the headlamp units in the front lamp units.

  Electrical function schematic for driving lights actuation MODEL 164.1 as of model year 2009 without CODE 615 (Bi-xenon headlamp unit with integrated curve illumination) without CODE 616 (Bi-xenon headlamp unit with integrated asymmetric curve illumination) MODEL 164.8 as of model year 2009 up to model year 2010 without CODE 615 (Bi-xenon headlamp unit with integrated curve illumination) without CODE 616 (Bi-xenon headlamp unit with integrated asymmetric curve illumination) MODEL 164.8 as of model year 2010 without CODE 615 (Bi-xenon headlamp unit with integrated curve illumination) without CODE 616 (Bi-xenon headlamp unit with integrated asymmetric curve illumination) without CODE 621 (Intelligent Light System (left-hand traffic)) without CODE 622 (Intelligent Light System (right-hand traffic)) PE82.10-P-2059-97MAA
  Electrical function schematic for driving lights actuation MODEL 251.0/1 as of model year 2009 up to model year 2011 without CODE 615 (Bi-xenon headlamp unit with integrated curve illumination) without CODE 616 (Bi-xenon headlamp unit with integrated asymmetric curve illumination) MODEL 251.0/1 as of model year 2011 without CODE 614 (Bi-xenon headlamp unit) without CODE 618 (Bi-xenon headlamps) PE82.10-P-2059-97RAA
  Overview of exterior lights system components   GF82.10-P-9998GM 
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