Part 1

GF82.10-P-3050CE Additional Functions For Driving Lights Actuation, Function
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 model refinement package
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)

Function requirements, general
^ No overvoltage or undervoltage (operating voltage range U greater than or equal to 7 less than or equal to 17.5 V)
^ Low beam ON
^ "Engine running" or "drive train operational" signal on
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 over front end CAN (CAN G) to the left xenon light control unit (E1n1) at the left front lamp unit (E1) and to the right xenon light control unit (E2n1) at the right front lamp unit (E2) or in model 204.0/2 as of 1.3.11, model 204.3 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:
^ Function sequence for corner-illuminating fog lamps (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 active curve lights (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))
^ 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)

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- lefthand traffic) or code (622) Intelligent Light System (right-hand traffic))
^ Turn signaling active and speed v < 40 km/h (except code (494) USA version) or
^ speed v < 60 km/h (with code (494) USA version) or Steering angle detected and speed v < 70 km/h

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 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.
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 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.
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
A Low beams light cone
B Corner-illuminating fog lamps light cone

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:
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:
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 reduced. The corresponding cornering light is actuated even when a curve radius of r less than or equal to 500m 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))
^ Function "Intell.Light System": activated in the "Settings", "Lights" menu in the instrument cluster
^ Vehicle moving forward
^ The "extended fog light function" (with code (621) Intelligent Light System (left-hand traffic) or code (622) Intelligent Light System (right-hand traffic)) is deactivated

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
A Low beams light cone
C Dynamic curve illumination light cone

The dynamic curve illumination function depends on the following control variables:
- Steering angle
- Vehicle speed
- Vehicle yaw behavior (vehicle movement)
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 information on vehicle motion over the chassis CAN.
The yaw behavior of the vehicle is detected by the yaw rate sensor for lateral and longitudinal acceleration (B24/15). This is designed as a separate component in model 204.920, 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, 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:
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:
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).
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.
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)
^ Vehicle moving forward