GF82.10-P-2009CEA Headlamp Control, Function
GF82.10-P-2009CEA Headlamp Control, 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 204.3
- 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)
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 17.5 V)
Driving lights actuation, general
Driving lights actuation includes all functions which serve the optimum illumination of the road while driving.
During driving lights actuation, the standing lights actuation is active; this is described in the "Standing/parking lights actuation, function" document.
The driving lights actuation function is comprised of the following subfunctions:
^ Function sequence for low beam actuation
^ Function sequence for high beam actuation
^ Function sequence for daytime running lights actuation
^ Function sequence for auto on/off headlamps
^ Function sequence for automatic headlamp range adjustment (HRA [LWR])
The driving lights are actuated corresponding to the position of the exterior lights switch (S1). The front SAM control unit with fuse and relay module (N10/1) reads in the status of the exterior lights switch on vehicles up to 31.5.10 via instrument panel LIN (LIN 1) and directly (voltage-coded) on vehicles as of 1.6.10.
Additional low beams actuation function requirements
^ Circuit 15 ON
The electronic ignition lock control unit (N73) sends the status of circuit 15 to the front SAM control unit over the interior CAN (CAN B).
Function sequence for low beam actuation
Turning the exterior lights switch to the "Manual driving lights" position requests actuation of the low beams.
The front SAM control unit reads in the status of the exterior lights switch, activates the low beams actuation and transmits the request "Low beams indicator lamp On" over the interior CAN to the instrument cluster (A1).
The instrument cluster actuates the low beams indicator lamp (A1e67).
Low beams actuation in model 204.0/2 up to 28.2.11, model 204.9:
The front SAM control unit sends the "Low beams On" request by transmitting a voltage signal (circuit 56) directly 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).
The left xenon light control unit actuates the left xenon bulb with integrated ignition module (E1e10).
The right xenon light control unit actuates the right xenon bulb with integrated ignition module (E2e10).
The xenon light control units operate in a master/slave combination, whereby the left xenon light control unit acts as the master and synchronizes the right xenon light control unit. Both xenon light control units communicate with each other via the front end CAN (CAN G).
Low beams actuation in model 204.0/2 as of 1.3.11, model 204.3, model 204.9:
The front SAM control unit sends the "Low beams On" request by transmitting a voltage signal (circuit 56) directly to the left xenon light power supply module (E1n4) at the left front lamp unit and to the right xenon light power supply module (E2n4) at the right front lamp unit.
The xenon light power supply modules actuate the xenon bulbs.
Model 204.0/2 as of 1.3.11, model 204.3:
The left xenon light power supply module communicates over the left headlamp LIN (LIN G1) with the headlamp control unit (N71/1).
The right xenon light power supply module communicates over the right headlamp LIN (LIN G2) with the headlamp control unit. The headlamp control unit controls the light output of the xenon bulbs
Model 204.9:
Following the corresponding release by the respective xenon light control unit, the xenon light power supply modules actuate the xenon bulbs.
The left xenon light power supply module communicates over the left headlamp LIN with the left xenon light control unit.
The right xenon light power supply module communicates over the right headlamp LIN with the right xenon light control unit.
The xenon light control units control the light output of the xenon bulbs.
Additional function requirements for high beam actuation
^ For high beams function: Circuit 15 and low beams On
^ For headlamp flasher function: Circuit 15R On
^ Adaptive high beams function (with code (608) Adaptive Highbeam Assist) not active
The electronic ignition lock control unit sends the status of circuit 15 to the front SAM control unit over the interior CAN.
Function sequence for high beam actuation
The high beams actuation is comprised of the following subfunctions:
^ Function sequence for high beams
^ Function sequence for headlamp flasher
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) reads in the position of the combination switch and transmits it to the front SAM control unit via the chassis CAN (CAN E).
The front SAM control unit receives the switch position of the combination switch and uses this to generate the request "High combination switch and uses this to generate the request "High beams On" and activates the high beams actuation.
High beams actuation in model 204.0/2 up to 28.2.11, model 204.9:
The front SAM control unit actuates the following components in the front lamp units:
- Left high beams (E1e1) (with model 204.0/2)
- Right high beams (E2e1) (with model 204.0/2)
- Left high beam solenoid (E1I1)
- Right high beam solenoid (E2I1)
When the high beam solenoids are actuated, the covers that partially block the light cones of the xenon bulbs are folded away, and the entire light beam is released for illuminating the roadway.
High beams actuation in model 204.0/2 as of 1.3.11, model 204.3:
The front SAM control unit transmits the switch position of the combination switch over the front end CAN to the headlamp control unit.
The headlamp control unit then actuates the following components in the front lamp units over the headlamp LIN:
- Left light distribution actuator motor (E1m3)
- Right light distribution actuator motor (E2m3)
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.
Additionally, the front SAM control unit transmits the "High beams On" request over the interior CAN to the instrument cluster, which then actuates the high beams 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. 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".
Since no additional high beams are installed in model 204.9, model 204.0/2 as of 1.3.11 and model 204.3, the low beams actuation is activated and the high beam solenoids or the light distribution actuator motors are actuated.
In vehicles with code (460) Canada version or code (494) USA version, the high beams function must not be used if left front fog lamp (E5/1) and right front fog lamp (E5/2) actuation is active.
The last incoming request has priority.
Front fog lamps are only installed in vehicles up to 30.11.09 and as of 1.12.09 without code (621) Intelligent Light System (left- hand traffic) and without code (622) Intelligent Light System (right- hand traffic).
Additional function requirements for daytime running lights actuation
^ "Daytime running lights" function: is activated in the "Settings", "Light" menu in the instrument cluster (except vehicles with code (460) Canada version)
^ "Engine running" or "drivetrain ready" signal set or vehicle speed v > 3 km/h
^ Exterior lights switch in position:
- Exterior lights Off "0" or
- "Left parking light" or "Right parking light" (up to 31.5.10) or
- Auto on/off headlamps "AUTO" (up to 31.5.10) or in position "A" (as of 1.6.10)
Function sequence for daytime running lights actuation
The instrument cluster sends the request "Daytime running lights On" depending on the country coding or if the daytime running lights request was manually activated in the menu "Settings", "Light" via interior CAN.
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 "drivetrain ready" signal over the chassis CAN.
The instrument cluster sends the vehicle speed over the interior CAN.
Vehicles up to 30.11.09 or as of 1.12.09 (except model 204.0/2 as of 1.3.11, model 204.3) without code (621) Intelligent Light System (left-hand traffic) and without code (622) Intelligent Light System (right-hand traffic):
The front SAM control unit reads in all of the relevant information and outputs the request "Switch on low beams" via a voltage signal (circuit 56b) directly to the xenon light control units.
In model 204.0/2, the xenon light control units then actuate the xenon bulbs.
In model 204.9 the front SAM control unit also actuates the xenon light power supply modules.
In accordance with the release by the relevant xenon light control unit, the xenon light power supply modules actuate the xenon bulbs.
In vehicles with code (460) Canada version or code (494) USA version, the front SAM control unit activates the standing and/or low beams actuation as a function of the ambient brightness. It is recorded by the light sensor (B38/1) (without code (345) Rain sensor) or by the rain/light sensor (B38/2) (with code (345) Rain sensor). The front SAM control unit reads in the data from the light sensor or the rain/light sensor via the wiper/inside rearview mirror LIN (LIN 2).
If the light sensor or the rain/light sensor recognizes that it is "day", the front SAM control unit activates the low beams actuation.
If the light sensor or the rain/light sensor recognizes that it is "dark", the front SAM control unit additionally activates the standing lights actuation.
Vehicles as of 1.12.09 with code (621) Intelligent Light System (left- hand traffic) or code (622) Intelligent Light System (right-hand traffic), model 204.0/2 as of 1.3.11, model 204.3:
The front SAM control unit reads in all relevant information, evaluates it and for vehicles without code (498) Japan version and without code (835) South Korea version (up to 28.2.11) it actuates the left daytime running lights headlamps (E1/3) and the right daytime running lights headlamps (E2/3).
In vehicles with code (498) Japan version, the front SAM control unit activates the low beams actuation; the daytime running lights headlamps are actuated as position lamps.
In vehicles with code (835) South Korea version, the daytime running lights headlamps are installed, but not actuated in vehicles up to 28.2.11.
When dark, the front SAM control unit actuates the daytime running lights headlamps with reduced power (night design circuit) and activates the low beam actuation.
The light sensor or the rain/light sensor detects the ambient brightness. The front SAM control unit reads in the data from the light sensor or the rain/light sensor via the wiper/inside rearview mirror LIN.
On vehicles with code (460) Canada version, the low beam actuation is always activated additionally.
The daytime running lights actuation is deactivated as soon as the exterior lights switch is turned to position "Standing lights", "Manual driving lights", "Left parking light" or "Right parking light" (as of 1.6.10).
In vehicles with code (460) Canada version, the front SAM control unit terminates the daytime running lights actuation when the vehicle is at a standstill once a period of t = 3 minutes has expired.
When the vehicle then starts to move again, the front SAM control unit automatically activates low beam lights actuation.
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 permissible only when the high beams are manually switched on via the exterior lights switch (without code (460) Canada version and without code (494) USA version).
Additional function requirements for auto on/off headlamps
^ "Engine running" or "drivetrain ready" signal set or vehicle speed v > 3 km/h
^ Exterior lights switch in position "AUTO" (up to 31.5.10) or in position "A" or in position "0" (up to 31.5.10) (can be coded)
^ Light sensor or rain/light sensor signals "Darkness recognized"
Function sequence for auto on/off headlamps
The auto on/off headlamps function is no more than a convenience system and does not exempt the driver from following the rules of the road traffic regulations.
The CDI control unit or the ME-SFI [ME] control unit sends the "engine running" signal or the "drivetrain operational" signal over the chassis 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 front SAM control unit reads in the status of the exterior lights switch over the instrument panel LIN or directly, and the light sensor or rain/light sensor data over the wiper/inside rearview mirror LIN.
With the auto on/off headlamps, the low beams are automatically switched on or off.
This occurs depending on the ambient brightness or depending on the activities of the wiper system:
^ Function sequence for auto on/off headlamps via light sensor or rain/light sensor
^ Function sequence for auto on/off headlamps via wiper activities
Function sequence for auto on/off headlamps via light sensor or rain/light sensor
The light sensor or the rain/light sensor evaluates the ambient brightness. The front SAM control unit reads in the data of the light sensor or the rain/light sensor via wiper/inside rearview mirror LIN and activates the low beams actuation if darkness is recognized.
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 wiper, rain or adverse weather light.
The front SAM control unit controls the wiper system and evaluates the data of the rain/light sensor or the wipe request via the combination switch for this.
If the windshield wiper system is activated for t = greater than or equal to 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 greater than or equal to 60 s, low beams actuation is deactivated.
Auto on/off headlamps switch-off conditions:
In the event of light sensor or 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.
If the wiper start-up suppression function is canceled, the auto on/ off headlamps remain active for an additional t = 60 s.
Additional function requirements for automatic headlamp range adjustment
^ Engine running" or "drive train operational" signal on
^ Driving lights On (low beam/high beam)
Function sequence for automatic HRA [LWR]
The automatic HRA [LWR] permits the correction of the headlamp range of the vehicle headlamps as a function of the load or the vehicle pitch motions induced by the vehicle dynamics.
The CDI control unit or the ME-SFI [ME] control unit sends the "Engine running" or "Drivetrain ready" signal over the chassis CAN, front SAM control unit and front end CAN to the left xenon light control unit or to the headlamp control unit.
To determine the current vehicle level, the left xenon light control unit (model 204.0/2 up to 28.2.11, model 204.9) or the headlamp control unit (model 204.0/2 as of 1.3.11, model 204.3) in vehicles without code (483) ADVANCED AGILITY package directly reads in the signals of the left rear level sensor (B22/7) and the left front level sensor (B22/8).
In vehicles with code (483) ADVANCED AGILITY package, the adaptive damping system control unit (N51/5) sends all data required to evaluate the vehicle level over the chassis CAN, front SAM control unit and front end CAN to the left xenon light control unit or to the headlamp control unit. To this end, the adaptive damping system control unit additionally evaluates the data of the right front level sensor (B22/9) and the right rear level sensor (B22/10).
Zero-point programming is performed at the end of production to compensate for suspension tolerances.
With successful programming, visual feedback occurs through the movement of the headlamp units "center-down-up-center".
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 headlamp range adjustment is reduced sharply.
The "dynamic mode" is activated depending on the amount of speed change and additional signals such as the brake pedal and the accelerator pedal positions.
When the vehicle is standing automatic headlamp range adjustment is accomplished in the "dynamic mode".
Information on wheel speed and wheel rotation direction, as indicators of vehicle speed, is sent by the Electronic Stability
Program control unit (N30/4) over the chassis CAN, front SAM control unit and front end CAN to the left xenon light control unit or to the headlamp control unit.
The xenon light control units operate in a master/slave combination, whereby the left xenon light control unit acts as the master and synchronizes the right xenon light control unit over the front end CAN.
The left xenon light control unit directly actuates the left headlamp range adjustment actuator motor (E1m1).
The right xenon light control unit directly actuates the right headlamp range adjustment actuator motor (E2m1).
The headlamp control unit actuates the headlamp range adjustment actuator motors over the headlamp LIN in each case.
