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Additional functions for driving lights actuation, function - GF82.10-P-3050CE

MODEL 204.0/2 with CODE (614) Bi-xenon headlamp unit with CODE (615) Bi-xenon headlamp unit with integrated curve illumination with CODE (616) Bi-xenon headlamp unit with integrated asymmetric curve illumination with CODE (618) Bi-xenon headlamps with CODE (621) Intelligent light system (left-hand traffic) with CODE (622) Intelligent light system (right-hand traffic) as of model year 2009/YoM 08 

MODEL 204.0/2 with CODE (608) Adaptive high beams assist as of model year 2012/YoM 11 facelift 

MODEL 204.3 with CODE (615) Bi-xenon headlamp unit with integrated curve illumination with CODE (616) Bi-xenon headlamp unit with integrated asymmetric curve illumination with CODE (621) Intelligent Light System (left-hand traffic) with CODE (622) Intelligent Light System (right-hand traffic) with CODE (608) Adaptive Highbeam Assist 

MODEL 204.9 with CODE (615) Bi-xenon headlamp unit with integrated curve illumination with CODE (621) Intelligent Light System (left-hand traffic) with CODE (622) Intelligent Light System (right-hand traffic) 

MODEL 204.9 with CODE (608) Adaptive high beams assist as of model year 2013/facelift 12 

Function requirements, general 

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 running" or the "drivetrain operational" signal over the chassis CAN (CAN E) to the front SAM control unit with fuse and relay module (N10/1) and to the multifunction camera (A40/11) (with code (608) Adaptive Highbeam Assist).

The front SAM control unit sends these signals in model 204.0/2 up to 28.2.11, model 204.9 up to 31.5.12 over the front end CAN (CAN G) to the left xenon light control unit (E1n1) on the left front lamp unit (E1) and to the right xenon light control unit (E2n1) on the right front lamp unit (E2) or in model 204.0/2 as of 1.3.11, model 204.3, model 204.9 as of 1.6.12 to the headlamp control unit (N71/1).

Additional functions, driving lights actuation, general 

The additional functions of driving lights actuation permit optimum illumination of the roadway for different road and weather conditions. This is achieved by increasing light output and through targeted actuation of additional light sources along with various actuators in the front lamp units.

Driving lights actuation is active during actuation of the driving lights actuation additional functions and is described in the "Driving lights actuation, function" document.

The driving lights actuation additional functions are comprised of the following subfunctions:

Additional function prerequisites for cornering lights (With code (619) Corner-illuminating fog lamps or code (615) Bi-xenon headlamp unit with integrated curve illumination or code (616) Bi-xenon headlamp unit with integrated asymmetric curve illumination or code (621) Intelligent Light System (left-hand traffic) or code (622) Intelligent Light System (right-hand traffic)) 

Function sequence for cornering lights (With code (619) Corner-illuminating fog lamps or code (615) Bi-xenon headlamp unit with integrated curve illumination or code (616) Bi-xenon headlamp unit with integrated asymmetric curve illumination or code (621) Intelligent Light System (left-hand traffic) or code (622) Intelligent Light System (right-hand traffic)) 

The cornering lights improve the illumination of the edge of the road on the inside of the curve.

Model 204.0/2 up to 30.11.09:

To output the function, the front SAM control unit actuates the left front fog lamp (E5/1) and the right front fog lamp (E5/2) in the front bumper. As of 1.12.09 this function will no longer be available.

The evaluation of all relevant information, the resulting actuation and any required fault handling are undertaken by the front SAM control unit.

Model 204.0/2 as of 1.3.11, model 204.3, model 204.9:

The corner-illuminating fog lamps are output by the left corner-illuminating fog lamp (E1e9) in the left front lamp unit and the right corner-illuminating fog lamp (E2e9) in the right front lamp unit.

In model 204.9 up to 31.5.12 the left xenon light control unit actuates the left corner-illuminating fog lamp and the right xenon light control unit the right corner-illuminating fog lamp.

The evaluation of all relevant information, the actuation resulting from this and any fault handling that is required are implemented by the left xenon light control unit.

IMPORTANT The xenon light control units operate in a master-slave combination and communicate with each other over the front end CAN. The left xenon light control unit takes on the master function and synchronizes the right xenon light control unit. The front SAM control unit sends all the relevant information over the front end CAN to the left xenon light control unit.

In model 204.0/2/3, model 204.9 as of 1.6.12 the headlamp control unit actuates the corner-illuminating fog lamps in the front lamp units. The evaluation of all relevant information, the resulting actuation and any required fault handling are undertaken by the headlamp control unit.

IMPORTANT Throughout the remainder of the description the term corner-illuminating fog lamps is used instead of the terms front fog lamps and corner-illuminating fog lamps.

The direct input factors for cornering lights actuation are the steering angle, recorded by the steering angle sensor (N49), and the turn signaling function, defined by the switch position of the combination switch (S4), because they describe the direction requirement of the driver.

The vehicle speed influences the actuation characteristic for cornering lights actuation.

At slow speed, a lower switch-on point is required to ensure that the cornering lights can be activated early in urban traffic.

Schematic of light distribution for active cornering lights actuation 

Fig 1: Active Cornering Lights Distribution Schematic Diagram
G10084703Courtesy of MERCEDES-BENZ USA

The steering column tube module control unit (N80) reads in the data of the steering angle sensor and the switch position of the combination switch and transmits them via chassis CAN. The vehicle speed is calculated on the basis of the wheel speeds. For this purpose, the Electronic Stability Program control unit (N30/4) sends the corresponding data over the chassis CAN. The instrument cluster (A1) calculates the vehicle speed to be displayed and sends this over the interior CAN (CAN B) and chassis CAN.

Only one cornering light is actuated: the light on the inside of the curve during forward travel and the light on the outside of the curve during reverse travel. If there is a rapid change in the steering wheel angle or in the turn signaling request, both corner-illuminating fog lamps may illuminate briefly. The corresponding cornering light is switched on and off with dimming.

The request by the turn signaling function has a higher priority below a speed of v = 40 km/h compared with the request by the detection of the steering angle in order to ensure the illumination of the edge of the road on the inside of the curve when the steering wheel is turned and turning in the opposite direction (situation at traffic circles).

When the reverse gear is engaged, only the data of the steering angle sensor is evaluated.

The "reverse gear engaged" status is defined as follows. Vehicles with transmission 711, 716:

Reverse gear engagement is defined by the status of the backup lamp switch (S16/2). The front SAM control unit reads in the status of the backup lamp switch directly.

Vehicles with transmission 722:

The request to engage gear range "R" is defined by the corresponding selector lever position.

The electronic selector lever module control unit (N15/5) sends the selector lever position via drive train CAN (CAN C), CDI control unit, or ME-SFI [ME] control unit and chassis CAN to the front SAM control unit.

Two microprocessors are installed in the front SAM control unit, one for control of basic functions, e.g. the exterior lights, and the second for control of the central gateway functions. Both processors communicate with each other internally via interior CAN.

The microprocessor for control of the central gateway functions uses the incoming information to generate the "Reverse gear engaged" signal that is independent of the type of transmission.

Model 204.0/2 up to 30.11.09:

The front SAM control unit reads in all relevant information, evaluates it and actuates the corresponding corner-illuminating fog lamp.

Model 204.9 up to 31.5.12:

The front SAM control unit sends all the relevant information over the front end CAN to the left xenon light control unit.

The left xenon light control unit evaluates this and synchronizes the left xenon light control unit as the master. The respective xenon light control unit then actuates the relevant cornering light.

Model 204.0/2 as of 1.3.11, model 204.3, model 204.9 as of 1.6.12:

The front SAM control unit sends all the relevant information over the front end CAN to the headlamp control unit.

The headlamp control unit evaluates this and actuates the corresponding corner-illuminating fog lamp.

If the cornering lights function is requested simultaneously by the detected steering angle and the turn signaling function, the actuation sensitivity is increased. The corresponding cornering light is actuated even when a curve radius of r ≤450m is detected.

When the function request suddenly no longer exists, the corresponding cornering light remains switched on for a holding time of approx. t = 2 s and is switched off within t = 2 s with dimming.

Additional function requirements, active curve illumination (with code (615) Bi-xenon headlamp unit with integrated curve illumination or code (616) Bi-xenon headlamp unit with integrated asymmetrical curve illumination or code (621) Intelligent Light System (left-hand traffic) or code (622) Intelligent Light System (right-hand traffic)) 

Active curve illumination function sequence (with code (615) Bi-xenon headlamp unit with integrated curve illumination or code (616) Bi-xenon headlamp unit with integrated asymmetrical curve illumination or code (621) Intelligent Light System (left-hand traffic) or code (622) Intelligent Light System (right-hand traffic)) 

Dynamic curve illumination improves the road illumination when cornering. For this the low beam cone is swiveled horizontally towards the center point of the curve.

A conventional bi-xenon headlamp serves as a basis, the headlamp unit of which is supported in a retaining frame so that it can swivel. When steering into a curve the headlamp unit on the inside of the curve is swiveled up to a = 15°, the headlamp unit on the outside of the curve up to a = 7.5°.

Schematic of light distribution for active dynamic curve illumination function 

Fig 2: Active Dynamic Curve Illumination Light Distribution Schematic Diagram
G10084704Courtesy of MERCEDES-BENZ USA

The dynamic curve illumination function depends on the following control variables:

The direct input factor is the steering angle, the vehicle speed influences the control response of the function (transformation of steering angle into swivel angle).

At a low vehicle speed, a smaller conversion is required so that the light pattern does not behave in a jumpy manner (e.g. in urban traffic).

At medium vehicle speeds an immediate response is given to relatively minor changes in the steering angle and at higher vehicle speeds the responses are dampened again to a greater extent. In order to compensate for the vehicle's natural pendulum motions when driving straight ahead, an area with lower sensitivity and greater damping is provided (approx. ± 6° steering angle).

The selection of the function is made through the controls in the instrument cluster. The instrument cluster sends the corresponding status over the chassis CAN.

The steering column tube module control unit sends data for the steering angle sensor and the Electronic Stability Program control unit sends the information on vehicle motion over the chassis CAN.

IMPORTANT The yaw behavior of the vehicle is detected by the yaw rate sensor for lateral and longitudinal acceleration (B24/15). In model 204.9, model 204.0/2 up to 28.2.11, model 204.0/2 as of 1.3.11 and model 204.3 with code (233) DISTRONIC PLUS, code (237) Active Blind Spot Assist or code (238) Active Lane Keeping Assist, model 204.077/277/377 this is designed as a separate component and it communicates over the vehicle dynamics CAN (CAN H) with the Electronic Stability Program control unit. For vehicles, for which the above-mentioned limitation does not apply, the yaw rate sensor for lateral and longitudinal acceleration is integrated into the Electronic Stability Program control unit.

The instrument cluster sends the vehicle speed via chassis CAN.

The front SAM control unit receives all relevant information and transmits it to the xenon light control units or the headlamp control unit over the front end CAN.

Model 204.0/2 up to 28.2.11, model 204.9 up to 31.5.12:

The left xenon light control unit actuates the left active curve lights actuator motor (E1m2) directly. The right xenon light control unit actuates the right active curve lights actuator motor (E2m2) directly.

Model 204.0/2 as of 1.3.11, model 204.3, model 204.9 as of 1.6.12:

The headlamp control unit actuates the left active curve lights actuator motor over the left headlamp LIN (LIN G1) and the right active curve lights actuator motor over the right headlamp LIN (LIN G2).

IMPORTANT The position of the active curve lights actuator motors at any given time and any faults that occur, such as short circuits or open circuits, are reported back to the corresponding control unit.

IMPORTANT If the curve illumination actuation is defective, the headlamp units are, if possible, swiveled into the central position. The current position of the headlamp units is defined via the signals of the left active curve illumination position sensor (E1b1) and the right active curve illumination position sensor (E2b1).

Additional function requirements, active light distribution (With code (621) Intelligent Light System (left-hand traffic) or code (622) Intelligent Light System (right-hand traffic) or code (608) Adaptive Highbeam Assist) 

Function sequence for active light distribution (With code (621) Intelligent Light System (left-hand traffic) or code (622) Intelligent Light System (right-hand traffic) or code (608) Adaptive Highbeam Assist) Active light distribution encompasses the following subfunctions: 

D Function sequence for freeway lights 

D Function sequence for extended fog light 

D Function sequence, adaptive high beams (with code (608) Adaptive Highbeam Assist) 

IMPORTANT The functions are described using a left-hand drive vehicle as an example.

Additional function requirements for freeway lights 

Function sequence for freeway lights 

The freeway lights improve the illumination of the road by increasing the range of the low beams without blinding the preceding traffic. This function is achieved by means of vertically deflecting the light cone and increasing the light output.

The freeway lights are activated at speeds typical for the freeway or expressway.

IMPORTANT The freeway lights function is deactivated when it is raining. Rain detection takes place by evaluating the windshield wiper signal (windshield wiper not in park position).

If the windshield wiper is in the park position for less than t = 600 ms, this is evaluated as continuous wiping. Rain is detected if the continuous wipe function is active for t > 2 min.

Schematic of light distribution for active freeway lights function 

Fig 3: Active Freeway Light Distribution Schematic Diagram
G10084705Courtesy of MERCEDES-BENZ USA

The freeway lights function depends on the following control factors:

The selection of the function is made through the controls in the instrument cluster. The instrument cluster sends the corresponding status over the chassis CAN.

The steering column tube module control unit sends data for the steering angle sensor and the Electronic Stability Program control unit sends information on vehicle motion over the chassis CAN. The instrument cluster sends the vehicle speed over the chassis CAN.

The front SAM control unit receives all relevant information and transmits it to the xenon light control units or the headlamp control unit over the front end CAN.

Starting at a vehicle speed of v = 90 km/h and a curve radius of r > 800 m for a driving distance of more than s = 2.5 km, the light output of the left xenon bulb with integrated ignition module (E1e10) and the right xenon bulb with integrated ignition module (E2e10) is increased linearly up to P = 38 W by the corresponding xenon light control unit or the headlamp control unit.

Model 204.0/2 up to 28.2.11, model 204.9 up to 31.5.12: Starting at a vehicle speed of v = 110 km/h and a curve radius of r > 800 m for a driving distance of more than s = 1 km the left xenon light control unit also actuates the left headlamp range adjustment actuator motor (E1m1).

The headlamp unit of the left front lamp unit is raised and thereby the range of the low beams increased. The maximum lift is reached at v = 130 km/h.

If the vehicle speed drops down to below v = 80 km/h, the "freeway lights" function is disabled.

Model 204.0/2 as of 1.3.11, model 204.3, model 204.9 as of 1.6.12: Starting at a vehicle speed of v = 110 km/h and a curve radius of r > 800 m for a driving distance of more than s = 1 km, the headlamp control unit actuates the left light distribution actuator motor (E1m3) over the left headlamp-LIN.

The position of the cover which partially covers up the xenon bulb light cone is changed accordingly thereby increasing the range of the low beams. Maximum release of the xenon lamp light cone is reached at v = 130 km/h.

If the vehicle speed drops down to below v = 80 km/h, the "freeway lights" function is disabled.

IMPORTANT The position of the light distribution actuator motors at any given time and any faults that occur, such as short circuits or open circuits, are reported back to the headlamp control unit.

Additional function requirements for extended fog light function 

Extended fog light function sequence 

The extended fog light function improves the illumination of the edges of the road and reduces the internal dazzling.

It is activated at speeds typical of urban traffic and rural roads. The xenon bulb light cone in the front lamp unit facing the inside of the road is raised and swiveled outwards at vehicle speeds below v = 70 km/h.

Schematic of light distribution for active extended fog light function 

Fig 4: Active Extended Fog Light Distribution Schematic Diagram
G10084706Courtesy of MERCEDES-BENZ USA

The selection of the function is made through the controls in the instrument cluster. The instrument cluster then sends the corresponding status and the vehicle speed over the chassis CAN.

Model 204.0/2 up to 28.2.11, model 204.9 up to 31.5.12: The headlamp unit of the front lamp unit facing the inside of the road is raised and swiveled outwards through a = 8°.

Internal dazzling is reduced and illumination of the road surface at the side is improved.

The left xenon light control unit then actuates the left headlamp range adjustment actuator motor and the left active curve light actuator motor directly.

Model 204.0/2 as of 1.3.11, model 204.3, model 204.9 as of 1.6.12:

The headlamp unit of the lamp unit facing the inside of the road is swiveled outwards through a = 8° changing the light distribution of the low beams.

The headlamp control unit then actuates the left active curve lights actuator motor and the left light distribution actuator motor over the left headlamp LIN.

Through actuation of the left light distribution actuator motor the part of the light-dark boundary that slopes to the right is covered.

Internal dazzling is reduced and illumination of the road surface at the side is improved.

IMPORTANT If the "extended fog light function" is active, the "dynamic curve illumination" function is deactivated.

If during the extended fog light function, the high beams function is requested, the position of the headlamp unit is retained.

In vehicles as of 1.12.09 the left daytime running lights headlamp (E1/3) and the right daytime running lights headlamp (E2/3) are switched off because of the risk of possible internal dazzling.

The extended fog light function is deactivated under the following conditions:

IMPORTANT When testing and adjusting the front lamp unit, ensure that the extended fog light function is not active.

Additional function requirements for adaptive high beams (with code (608) Adaptive Highbeam Assist) 

Function sequence for adaptive high beams (with code (608) Adaptive Highbeam Assist) 

The adaptive high beams function is an assistance function. The headlamp range of the driving lights is adapted to the distance of the nearest preceding or oncoming road user by means of actuation of various actuators in the front lamp units.

If no road users are detected, the adaptive high beams function automatically activates the high beams.

Fig 5: Identifying Adaptive High Beams Range
G10084707Courtesy of MERCEDES-BENZ USA

The selection of the function is made through the controls in the instrument cluster. The instrument cluster transmits the corresponding status via interior CAN to the front SAM control unit. The steering column tube module control unit sends the position of the combination switch over the chassis CAN to the front SAM control unit.

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

After evaluating all function requirements, the front SAM control unit sends the enabling of the adaptive high beams function via chassis CAN to the multifunction camera.

The activated adaptive high beams function is shown on the instrument cluster by means of a symbol in the travel distance display (A1p7) (model 204.0/2/3/9 (except 204.077/277/377) without code (442) Comfort multifunction steering wheel) or in the multifunction display (A1p13) (with code (442) Comfort multifunction steering wheel, model 204.077/277/377). The front SAM control unit sends the "Adaptive high beams active" status via interior CAN to the instrument cluster for this.

The multifunction camera also evaluates the following information, among other things, to implement the adaptive high beams function:

The steering angle sensor data are sent by the steering column tube module control unit and information on the wheel speeds and wheel rotation directions as indicators of vehicle speed and vehicle yaw characteristics, is sent by the Electronic Stability Program control unit over the chassis CAN to the multifunction camera.

The traffic and environment situation in front of the vehicle is detected by the multifunction camera and accordingly evaluated.

Activation of the actuators installed in the front lamp units ensures the best possible illumination of the roadway without generating any dazzling effect for other road users.

The multifunction camera uses the brightness, shape, structure, color, where applicable, and motion of detected objects to differentiate between preceding or oncoming road users, street lighting, signs or other parts of the infrastructure.

The picture recognition module integrated into the multifunction camera judges the distance to the other road users, evaluates the outside brightness level of the vehicle environment and recognizes extreme weather conditions (e.g. thick fog, heavy snowfall) or tunnels.

A distinction is made between the following functions states:

Optical headlamp range adjustment:

Depending on the distance of the vehicle to other road users and the geometry of the road (differences in height, angle), the multifunction camera sends the "Optical headlamp range adjustment" request via chassis CAN, front SAM control unit and front end CAN to the headlamp control unit.

The headlamp control unit then actuates the left headlamp range adjustment actuator motor over the left headlamp LIN and the right headlamp range adjustment actuator motor (E2m1) over the right headlamp LIN.

The headlamp units of the front lamp units are raised accordingly. The road surface is better illuminated without causing a dazzling effect for other road users.

The light cone of the xenon light varies between s = 65 m (standard lighting) and s = 300 m.

If the vehicle speed sinks below v = 40 km/h, the "Optical headlamp range adjustment" is deactivated.

Automatic high beams:

The xenon bulb light cones are not fully released until vehicle speed is greater than v = 55 km/h and no other road users are detected. To this end, the headlamp control unit actuates the left light distribution actuator motor over the left headlamp-LIN and the right light distribution actuator motor (E2m3) over the right headlamp-LIN. The rollers which partially cover up the xenon bulb's light cone, are turned thereby uncovering the entire light beam to illuminate the traffic lane.

The multifunction camera sends the request for this via chassis CAN, front SAM control unit and front end CAN to the headlamp control unit.

If the vehicle speed sinks below v = 45 km/h, the automatic high beams are deactivated.

The activation or deactivation speed of the automatic high beams is controlled adaptively by the multifunction camera.

IMPORTANT As soon as the automatic high beams are activated, the high beams indicator lamp (A1e3) in the instrument cluster lights up.

On roads with street lamps positioned regularly, the automatic high beams are deactivated.

Limits of the adaptive high beams:

In tight curves, the multifunction camera may not recognize oncoming = 35°), vehicles or only do so very late due to the recording angle (The automatic high beams are deactivated depending on the steering angle.

On streets with structural separation (e.g. guardrails on freeways) the headlamps of oncoming vehicles are often concealed. These vehicles are not recognized by the multifunction camera. The automatic high beams are not switched off.

Due to the geometry of the structural separation and the location of the headlamps on cars, the drivers of the oncoming cars are not dazzled. Truck drivers, however, are dazzled due to the high seat position. The clearance lamps on trucks are not sufficient for recognition.

When driving over crests, oncoming vehicles are not recognized until late and the automatic high beams are therefore also switched off later. In this situation, however, the driver of the oncoming vehicle is also dazzled by the low beams.

Lights that are visible for a long time and that slowly become brighter (e.g. with partial concealment of the headlamps by trees) make it more difficult to recognize oncoming vehicles.

With bright lights that appear suddenly (e.g. street lamps, traffic lights, lot illumination), the automatic high beams are deactivated.

Some reflectors cannot be clearly differentiated by road users (e.g. motorcyclists). The automatic high beams are deactivated because of the existing danger of dazzling other road users.

REFER TO SYSTEM WIRING DIAGRAMS Electrical function schematic for cornering illumination Model 204.0/2 up to 30.11.09 with code (619) Cornering lights PE82.10-P-2061-97FAB
Model 204.9 up to 31.5.12 with code (619) Corner-illuminating fog lamps PE82.10-P-2061-97FAC
REFER TO SYSTEM WIRING DIAGRAMS Electrical function schematic, additional functions, driving lights actuation Model 204.0/2 up to 28.2.11 with code (615) Bi-xenon headlamp unit with integrated curve illumination or code (616) Bi-xenon headlamp unit with integrated asymmetric curve illumination or code (621) Intelligent light system (left-hand traffic) or code (622) Intelligent light system (right-hand traffic) PE82.10-P-2063-97FAA
Model 204.0/2 as of 1.3.11, model 204.3 with code (615) Bi-xenon headlamp unit with integrated curve illumination or code (616) Bi-xenon headlamp unit with integrated asymmetric curve illumination or code (621) Intelligent Light System (left-hand traffic) or code (622) Intelligent Light System (right-hand traffic): PE82.10-P-2063-97FAC
Model 204.9 up to 31.5.12 with code (615) Bi-xenon headlamp unit with integrated curve illumination or code (621) Intelligent Light System (left-hand traffic) or code (622) Intelligent Light System (right-hand traffic) PE82.10-P-2063-97FAB
Model 204.9 as of 1.6.12 with code (615) Bi-xenon headlamp unit with integrated curve illumination or code (621) Intelligent Light System (left-hand traffic) or code (622) Intelligent Light System (right-hand traffic) PE82.10-P-2063-97FAD
  Overview of exterior lights system components   GF82.10-P-9998CE 
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