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

MODEL 216.3 as of model year 2009/YoM 08 

MODEL 221.0/1 up to 31.5.09 with CODE (615) Bi-xenon headlamp unit with integrated curve illumination with CODE (616) Bi-xenon headlamp unit with integrated asymmetrical curve illumination as of model year 2009/YoM 08 

MODEL 221.0/1 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 high beams assist as of Model Year 2010/CY 09 model refinement package 

Function requirements, general 

IMPORTANT The status of circuit 61 or the "PT_Rdy" signal is sent by the CDI control unit (N3/9) (with diesel engine) or the ME-SFI [ME] control unit (N3/10) (with gasoline engine) via chassis CAN (CAN E)

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 takes place by increasing the light output of individual light sources, selectively actuating additional light sources and various actuators in the left front lamp unit (E1) and in the right front lamp unit (E2).

Driving lights actuation is active during actuation of the driving lights actuation additional functions; this is described in the appropriate "Driving lights actuation, function" service information.

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

Additional function requirements, cornering lights (with code (619) Cornering lights) 

Cornering lights function sequence (with code (619) Cornering lights) 

The cornering lights function enables the traffic lane in the cornering direction to be ideally illuminated and is implemented by means of actuation of the cornering lights (E1e9) or cornering lights (E2e9) in the respective lamp unit.

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 evaluation of all relevant information, the resulting actuation and any required treatment of faults is undertaken by the xenon headlamp control unit on the left front lamp unit (E1n1).

The xenon headlamp control unit at the left front lamp unit and the xenon headlamp control unit (E2n1) at the right front lamp unit operate in a master/slave combination and communicate with one another via front end CAN (CAN G).

The xenon headlamp control unit at the left front lamp unit is responsible for the master function and synchronizes the xenon headlamp control unit at the right front lamp unit.

IMPORTANT In model 216 as of 1.9.10 and in model 221 as of 1.6.09 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), light-emitting diodes (LED) are used for the output of the cornering lights function instead of conventional bulbs. The cornering light in the left front lamp unit is actuated by the left turn signal and cornering light voltage converter (E1n6) and the cornering light in the right front lamp unit is actuated by the right turn signal and cornering light voltage converter (E2n6).

The turn signal and cornering light voltage converters are each located at the bottom of the front lamp units and connected to the respective xenon headlamp control unit via local interconnect network (LIN).

The request to output the function is output by the xenon headlamp control unit. The front SAM control unit with fuse and relay module (N10/1) ensures the power supply of the turn signal and cornering light voltage converters.

The direct input factors are the steering wheel angle, recorded by the steering angle sensor (N49), 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 system behavior of the turning light actuation.

At a slower vehicle speed a lower switch-on point is required to ensure that the cornering light actuation can be activated early in urban traffic.

The steering column tube module (N80) reads in the data of the steering angle sensor as well as the switch position of the combination switch and sends these via chassis CAN, central gateway control unit (N93) and front end CAN to the xenon headlamp control unit at the left front lamp unit.

Information on the wheel speeds and the wheel rotation directions is sent by the ESP control unit (N47-5) (without model 221.095/195) or the regenerative braking system control unit (N30/6) (model 221.095/195) as an indicator of the vehicle speed via chassis CAN, central gateway control unit and front end CAN to the xenon headlamp control unit at the left front lamp unit.

The xenon headlamp control unit at the left front lamp unit evaluates all the relevant incoming data and synchronizes the xenon headlamp control unit at the right front lamp unit.

The xenon headlamp control units actuate the cornering illumination through pulses to match the request.

The request by the turn signaling function has a higher priority below a vehicle 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 roundabouts).

When the reverse gear is engaged, only the data of the steering angle sensor is evaluated. The intelligent servo module for DIRECT SELECT (A80) sends the status of the current transmission selector lever position via drive train CAN (CAN C), CDI control unit or ME-SFI [ME] control unit, chassis CAN, central gateway control unit and front end CAN to the left front lamp unit.

The xenon headlamp control unit at the left front lamp unit evaluates this and synchronizes the xenon headlamp control unit at the right front lamp unit.

If the cornering lights function is requested simultaneously by the detected steering wheel angle and the turn signaling function, the system sensitivity is reduced. The corresponding cornering light is actuated as soon as a curve radius of r 500m is detected. When the function request suddenly no longer exists, the corresponding cornering illumination 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, dynamic curve illumination 

Function sequence, dynamic curve illumination 

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 turning into a corner, the headlamp unit of the front lamp unit on the inside of the corner is swiveled by up to = 15° and the headlamp unit of the front lamp unit on the outside of the corner by up to α = 7.5°.

Dynamic curve illumination actuation depends on the following input factors:

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

At a low vehicle speed a lower transformation is required so that the light pattern does not behave in a jumpy manner, in urban traffic for example.

At medium vehicle speeds, immediate responses occur to relatively minor changes in the steering wheel angle and at higher vehicle speeds, the system responses are dampened again to a greater extent.

In order to adjust for natural weaving of the vehicle when driving straight ahead, an area with lower sensitivity and increased damping is planned (approx. ± 6° steering wheel angle).

The data of the steering angle sensor is sent by the steering column tube module via chassis CAN, central gateway control unit and front end CAN to the xenon headlamp control unit at the left front lamp unit.

Information on the wheel speeds and the wheel rotation directions is sent by the ESP control unit or the regenerative braking system control unit as an indicator of the vehicle speed and for the yaw behavior of the vehicle via chassis CAN, central gateway control unit and front end CAN to the xenon headlamp control unit at the left front lamp unit.

IMPORTANT The yaw behavior of the vehicle is detected by the yaw rate sensor for lateral and longitudinal acceleration (B24/15). The yaw rate sensor for lateral and longitudinal acceleration sends the data on the yaw behavior of the vehicle via vehicle dynamics CAN (CAN H) to the ESP control unit or the regenerative braking system control unit.

The xenon headlamp control unit at the left front lamp unit evaluates all the relevant incoming data and synchronizes the xenon headlamp control unit at the right front lamp unit.

In accordance with the request, the xenon headlamp control unit at the left front lamp unit actuates the left dynamic curve illumination motor (E1m2) and the xenon headlamp control unit at the right front lamp unit actuates the right dynamic curve illumination motor (E2m2).

IMPORTANT In order to avoid dazzling the oncoming traffic with a defective curve illumination, the headlamp units are swiveled to a center position or the low beam actuation is deactivated.

If a motor of the dynamic curve illumination fails, the headlamp unit is completely lowered by means of actuation of the left headlamp range adjustment motor (E1m1) or the right headlamp range adjustment motor (E2m1).

Additional function sequence, active light distribution (Model 216, model 221 as of 1.6.09 with code (621) Intelligent Light System (left-hand traffic) or code (622) Intelligent Light System (right-hand traffic)) 

Function sequence for active light distribution (Model 216, model 221 as of 1.6.09 with code (621) Intelligent Light System (left-hand traffic) or code (622) Intelligent Light System (right-hand traffic)) 

The active light distribution function comprises the following subfunctions:

D Freeway lights function sequence 

D Extended fog light function sequence 

D Function sequence for Adaptive Highbeam Assist (in model 216 as of 1.9.10 and in model 221 as of 1.6.09 with code (608) Adaptive Highbeam Assist) 

D Function sequence for activating hazard light (as of 1.6.11 with code (610) Night View Assist) 

IMPORTANT The function sequences are each described on the left-hand drive vehicle as an example.

Additional function requirements, freeway lights 

Freeway lights function sequence 

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 implemented by vertically deflecting the light cone. 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 less than t = 600 ms, this is evaluated as continuous wipe. Rain is detected if the continuous wipe function is active for t > 2 min.

The freeway lights function depends on the following set variables:

The release of the freeway lights function takes place manually via the operation level in the instrument cluster.

The instrument cluster sends the corresponding status and the vehicle speed via central CAN (CAN F), central gateway control unit and front end CAN to the xenon headlamp control unit at the left front lamp unit.

The steering column tube module sends the data of the steering angle sensor and the ESP control unit or the regenerative braking system control unit sends the information on the vehicle movement (wheel rotation direction, yaw rate, etc.) via chassis CAN, central gateway control unit and front end CAN to the xenon headlamp control unit at the left front lamp unit.

This evaluates the data and synchronizes the xenon headlamp control unit at the right front lamp unit.

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

In addition, at a speed of v > 110 km/h and a cornering radius of r > 800 m for a driving distance of more than s = 1 km, the headlamp unit of the left front lamp unit is raised by actuating the left headlamp range adjustment motor. The maximum lift is reached at v = 130 km/h.

In model 216 as of 1.9.10, model 221 as of 1.6.09 the left light distribution actuator motor (E1m3) or right light distribution actuator motor (E2m3) is also actuated.

A piece of the covered light cone of the xenon bulb is thus freed and the range of the low beams increased.

In model 216 up to 31.8.10 without code (610) Night View Assist, the xenon headlamp control unit at the left front lamp unit sends the request "Switch on high beams" via front end CAN, central gateway control unit and interior CAN to the front SAM control unit. The front SAM control unit then actuates the left high beam/motorway spotlight (E1e1) and right high beam/motorway spotlight (E2e1), each dimmed (switch-on within t = 1 s, switch off within t = 4 s).

The xenon headlamp control unit on the left headlight unit actuates the left high beam solenoid/motorway spotlight (E1I2) and the xenon headlamp control unit on the right headlight unit actuates the right high beam solenoid/motorway spotlight (E2I2).

This partly covers up the light cone of the high beam/motorway spotlight in order to prevent other road users from being dazzled. If the vehicle speed drops down to below v = 80 km/h, the "freeway lights" function is disabled.

IMPORTANT For vehicles with code (610) Night View Assist, the high beams/motorway spotlights are replaced by the left infrared lamp (E1e11) and the right infrared lamp (E2e11).

Additional function requirements, extended fog light function 

Function sequence for extended fog light function 

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

It is activated at speeds typical of urban traffic and rural roads.

The headlamp unit of the front lamp unit facing the inside of the road is raised and swiveled outwards at speeds below v =70 km/h.

The extended fog light function is enabled manually via the operation level in the instrument cluster.

The instrument cluster sends the corresponding status and the vehicle speed via central CAN, central gateway control unit and front end CAN to the xenon headlamp control unit at the left front lamp unit.

The upper control panel control unit (N72/1) reads in the status of the rotary light switch (S1) via the instrument panel LIN (LIN 1) and sends it via interior CAN (CAN B), central gateway control unit and front end CAN to the xenon headlamp control unit at the left front lamp unit.

Information on the wheel speeds and wheel rotation direction is sent by the ESP control unit or the regenerative braking system control unit as an indicator of the vehicle speed via chassis CAN, central gateway control unit and front end CAN to the xenon headlamp control unit at the left front lamp unit.

In model 216 up to 31.8.10, the xenon headlamp control unit at the left front lamp unit actuates the left headlamp range adjustment motor and the left dynamic curve illumination motor.

The headlamp unit is swiveled outward through α = 8° and then lowered. This in turn serves to reduce internal dazzling and the side illumination of the travel lane is improved.

In model 216 as of 1.9.10 and in model 221 as of 1.6.09, the xenon headlamp control unit at the left front lamp unit actuates the left light distribution actuator motor and the left dynamic curve illumination motor.

The headlamp unit of the left front lamp unit is swiveled outwards by = 8° and the part of the light-dark boundary that slopes to the right is covered. This in turn serves to reduce internal dazzling and the side illumination of the travel lane is improved.

IMPORTANT If the "extended fog light function" is active the "dynamic curve illumination" function is switched off. If during active "extended fog lights" the high beams function is requested, the position of the headlamp unit is retained.

Additional function requirements, Adaptive Highbeam Assist (in model 216 as of 1.9.10 and in model 221 as of 1.6.09 with code (608) Adaptive Highbeam Assist) 

Function sequence for Adaptive Highbeam Assist (in model 216 as of 1.9.10 and in model 221 as of 1.6.09 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 1: Identifying Low Beams Light Cone With Optical Headlamp Range Adjustment
G10112148Courtesy of MERCEDES-BENZ USA

The adaptive high beams function is enabled manually via the operation level in the instrument cluster.

The instrument cluster sends the corresponding status and the vehicle speed via central CAN, central gateway control unit and interior CAN to the front SAM control unit. The steering column tube module sends the switch position of the combination switch via chassis CAN, central gateway control unit and interior CAN to the front SAM control unit.

The upper control panel control unit sends the status of the rotary light switch via interior CAN to the front SAM control unit. After the evaluation of all function requirements, the front SAM control unit sends the enable of the adaptive high beams function via interior CAN, central gateway control unit and chassis CAN to the multifunction camera.

The activated adaptive high beams function is displayed by a symbol in the multifunction display (A1p13) in the instrument cluster. For this purpose, the front SAM control unit sends the status "Adaptive high beams active" via interior CAN, central gateway control unit and central CAN to the instrument cluster.

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

The data of the steering angle sensor is sent by the steering column tube module and the information on the wheel speed and wheel rotation direction is sent by the ESP control unit or the regenerative braking system control unit as an indicator of vehicle speed and for the yaw behavior of the vehicle via 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 road surface 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 (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 request "Optical headlamp range adjustment" via chassis CAN, central gateway control unit and front end CAN to the xenon headlamp control units.

The xenon headlamp control units then actuate the headlamp range adjustment actuator motors.

The headlamp units in 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 low beams 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:

If no other road user is recognized above a vehicle speed of v = 55 km/h, the xenon headlamp control units also actuate the light distribution actuator motors, whereby the covers that partially block the light cones of the xenon bulbs are completely moved away. The multifunction camera sends the request for this via chassis CAN, central gateway control unit and front end CAN to the xenon headlamp control units.

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 vehicles or only do so very late due to the recording angle (∠= 35°).

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.

Additional function requirements, activating hazard light (as of 1.6.11 with code (610) Night View Assist) 

Function sequence for activating hazard light (as of 1.6.11 with code (610) Night View Assist) 

With the hazard light function, the light cone of the xenon bulb of the front lamp unit facing the outside of the road is deflected in the direction in which the Night View Assist system recognized a person on the side of the road.

The driver can thus avoid a possible collision with this person. Preceding or oncoming road users are not dazzled.

The multifunction camera sends status information on the adaptive high beams function to the Night View Assist control unit (N101).

The Night View Assist control unit calculates the position to be expected for the recognized person in the visual field of the driver depending on different variables (e.g. vehicle speed) and sends corresponding data via chassis CAN, central gateway control unit and front end CAN to the xenon headlamp control unit at the left front lamp unit (in right-hand drive vehicle) or to the xenon headlamp control unit at the right front lamp unit (in left-hand drive vehicle).

The corresponding xenon headlamp control unit then actuates the left light distribution actuator motor (in right-hand drive vehicle) or right light distribution actuator motor (in left-hand drive vehicle) accordingly.

The cover that partially blocks the low beam light cone is turned and the low beam light cone is thus deflected in the direction of the recognized person.

REFER TO SYSTEM WIRING DIAGRAMS Electrical function schematic, additional functions, driving lights actuation Model 216 PE82.10-P-2063-97CAA
Model 221 PE82.10-P-2063-97SAA
  Component description for instrument cluster A1
Model 216, 221 (except 221.095/195)		 GF54.30-P-6000LE
Model 221.095/195 GF54.30-P-6000LEH
  Component description for multifunction camera A40/11
In model 221 as of 1.6.09 or model 216 as of 1.9.10 with code (238) Active Lane Keeping Assist or code (476) Automatic Lane Recognition or code (513) Speed Limit Assist or with code (608) Adaptive Highbeam Assist		 GF54.21-P-3300LE
  Component description for intelligent servo module for DIRECT SELECT A80
With transmission 722.6		 GF27.19-P-4020ACS
For transmission 722.9 (except code 722.931/950) GF27.19-P-4020AHS
With transmission 722.931 GF27.19-P-4020AHT
With transmission 722.950 GF27.19-P-4020LEH
  Component description for yaw rate sensor for lateral and longitudinal acceleration B24/15 GF42.45-P-4810LE
  Component description for Xenon headlamp control unit E1n1, E2n1 GF82.10-P-2114LE 
  Component description for CDI control unit N3/9
Model 221 with engine 629		 GF07.16-P-6000OA
Model 221 with engine 642.8 GF07.16-P-6000OHS
Model 221 with engine 642.9 GF07.16-P-6000OHL
Model 221 with engine 651 GF07.16-P-6000OLS
  Component description for ME-SFI [ME] control unit N3/10
With engine 156		 GF07.61-P-6000MAS
For model 221 with engine 272 (except 272.974) GF07.61-P-6000MIS
Model 221 with engine 272.974 GF07.61-P-6000MEH
With engine 273 GF07.61-P-6000MLS
With engine 275 GF07.61-P-6000MOS
Model 221 with engine 276 GF07.61-P-6000MMB
With engine 157, 278. GF07.61-P-6000MMC
  Component description for front SAM control unit with fuse and relay module N10/1 GF54.21-P-6070LE
  Component description for regenerative braking system control unit N30/6
On model 221.095/195		 GF42.22-P-1100LEH
  Component description for ESP control unit N47-5
On model 216, 221 (except 221.095/195)		 GF42.45-P-5118LE
  Upper control panel control unit, component description N72/1 GF54.21-P-6040LE
  Component description for steering column tube module N80 GF54.21-P-6050LE
  Component description for central gateway control unit N93 GF54.21-P-4170LE
  Night View Assist control unit, component description N101
As of 1.6.11 with code (610) Night View Assist		 GF54.30-P-6200LE
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