Headlamp Control, Function - GF82.10-P-2009RF
Model 205, Model 253
except code 631 (Static LED headlamps, left-hand traffic)
except code 632 (Headlamps, LED, static, right-side traffic)
except code 640 (High-performance LED)
except code 641 (Dynamic LED headlamps, left-hand traffic)
except code 642 (Dynamic LED headlamps, right-hand traffic)
Function requirements, general
- No overvoltage or undervoltage
Driving lights actuation, general
Driving lights actuation includes all functions which serve the optimum illumination of the road while driving.
The driving lights actuation encompasses 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 driving lights
- Function sequence for headlamp range adjustment (HRA) (except CODE 460 (Canada version), and except CODE 494 (USA version), and except model 205 with CODE 483 (ADVANCED AGILITY package) and CODE 489 (AIRMATIC), and except model 253 with CODE 489 (AIR BODY CONTROL))
The driving lights are actuated corresponding to the position of the exterior lights switch (S1). The front SAM control unit (N10/6) reads in the status of the exterior lights switch directly.
Additional function requirements for low beams actuation
- Terminal 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 into the "low beams" position requests actuation of the low beams.
The front SAM control unit reads in the status of the exterior lights switch directly, and 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). The front SAM control unit also transmits the request "Low beams indicator lamp On" via the interior CAN, the electronic ignition lock control unit and the user interface CAN (CAN HMI) to the instrument cluster (A1), which then actuates the low beams indicator lamp (A1e67). If low beams actuation is active, the standing lights actuation in the front lamp units is switched off. This is because of the different light colors of the light source.
The standing lights actuation is not switched off in the following countries:
- Brazil
- Georgia
- Canada
- Korea
- Russia
- Ukraine
- USA
- Belarus
Additional function requirements, high beam actuation
- For high beams function: Circuit 15 and low beams On
- For headlamp flasher function: Circuit 15R On
The electronic ignition lock control unit sends the status of circuit 15 to the front SAM control unit via 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) directly reads in the switch position of the combination switch and sends it to the front SAM control unit via the chassis FlexRay (Flex E), electronic ignition lock control unit and interior CAN.
The front SAM control unit receives the switch position of the combination switch and actuates the left high beam (E1e1) and the right high beam (E2e1) directly.
The front SAM control unit also transmits the status "High beams ON" via the interior CAN, the electronic ignition lock control unit and the user interface 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".
Additional function requirements for daytime running lights actuation
- "Daytime running lights" function in menu "Settings", "Light" in the instrument cluster activated (with CODE 494 (USA version), or code 498 (Japan version))
- Circuit 15 ON and "engine running" signal or "drivetrain operational" set or circuit 15 ON and vehicle speed v > 3 km/h
- Exterior lights switch in "AUTO" position (in vehicles except CODE 460 (Canada version)) or exterior lights switch in Left parking lights or Right parking lights position (in vehicles with CODE 460 (Canada version))
Model 205, Model 253 with CODE 494 (USA version), Model 205, Model 253 with CODE 498 (Japan version)
The instrument cluster sends the "Daytime running lights ON" menu status to the front SAM control unit via user interface CAN, electronic ignition lock control unit and interior CAN.
The electronic ignition lock control unit sends the status of circuit 15 to the front SAM control unit via the interior CAN.
The CDI control unit (N3/9) (diesel engine) or the ME-SFI [ME] control unit (N3/10) (gasoline engine) transmits the "Engine running" or "Drivetrain operational" signal via the drive train CAN (CAN C1), the powertrain control unit (N127), the chassis FlexRay, the electronic ignition lock control unit and the interior CAN to the front SAM control unit.
The instrument cluster sends the vehicle speed to the front SAM control unit over the user interface CAN (CAN HMI), electronic ignition lock control unit and interior CAN.
The front SAM control unit reads in the status of the exterior lights switch directly.
Function sequence for daytime running lights actuation
The front SAM control unit reads in all relevant information, evaluates it and actuates the daytime running lights in the left parking light, standing light and daytime running light (E1e13) and the daytime running lights in the right parking light, standing light and daytime running light (E2e13) directly in vehicles except code 498 (Japan version).
Model 205, Model 253 with CODE 498 (Japan version)
Instead of the daytime running lights, the low beams actuation is activated.
Depending on the ambient light situation, taillight actuation (without license plate illumination) is activated in twilight a well as daytime running lights actuation. The low beams actuation is activated as it gets darker.
This function is not available in the following countries:
- China
- Taiwan
- Japan
- India
Model 205, Model 253 with CODE 460 (Canada version)
When the vehicle is stationary, the daytime running lights actuation is switched off after t = 3 min. When the vehicle then starts to move again, the front SAM control unit automatically activates daytime running lights actuation.
Additional function requirements for auto on/off driving lights
- Circuit 15 ON and "engine running" signal or "drivetrain operational" set or circuit 15 ON and vehicle speed v > 3 km/h
- Exterior lights switch in "AUTO" position (in vehicles except CODE 460 (Canada version)) or exterior lights switch in Left parking lights or Right parking lights position (in vehicles with CODE 460 (Canada version))
The electronic ignition lock control unit sends the status of circuit 15 to the front SAM control unit via the interior CAN.
The "Engine running" or "Drivetrain operational" signal is sent by the CDI control unit or the ME-SFI [ME] control unit to the front SAM control unit via drive train CAN, powertrain control unit, chassis FlexRay, electronic ignition lock control unit and interior CAN.
The instrument cluster sends the vehicle speed to the front SAM control unit over the user interface CAN (CAN HMI), electronic ignition lock control unit and interior CAN.
The front SAM control unit reads in the status of the exterior lights switch directly.
Function sequence for auto on/off driving lights
In the auto on/off driving lights, the low beams are automatically switched on or off.
The auto on/off driving lights are purely a comfort function and do not relieve the driver of the need to follow the operating instructions as prescribed by the road traffic regulations.
| Behavior of exterior lights when auto on/off driving lights activated at night | ||
|---|---|---|
| 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 after t = 2 s | Off |
| "Engine running" or "drive train operational" signal set or vehicle speed v > 3 km/h | Off | On (high beams permissible) |
| End of trip At the end of the trip, the auto on/off driving lights and ambient illumination functions may overlap. |
Standing lamp | Low beam |
| "Engine running" or "drive train operational" signal set or vehicle speed v > 3 km/h | Off | On (high beams permissible) |
| Circuit 15R ON | On after t = 2 s | 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 windshield wiper system:
- Function sequence for auto on/off driving lights over light sensor (B38/2b2) in rain/light sensor with additional functions (B38/2)
- Function sequence for auto on/off driving lights over wiper activities
Function sequence for auto on/off driving lights over light sensor in rain/light sensor with additional functions
The ambient brightness is detected by the light sensor. The rain/light sensor with additional functions reads in the light sensor signals directly, evaluates them and sends the "Low beams ON" request via rain/light sensor-LIN (LIN B16) to the front SAM control unit, which then activates the low beams actuation.
In the event of any light sensor failure, the auto on/off driving lights 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 driving lights function remains switched on.
Function sequence for auto on/off driving lights over wiper activities
If the low beams are switched on or off due to the activities of the windshield wiper system, one refers to adverse weather light. The front SAM control unit actuates the windshield 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.
If the wiper startup suppression function is canceled, the auto on/off driving lights remain active for an additional t = 60 s.
Additional function requirements for HRA (except CODE 460 (Canada version), and except CODE 494 (USA version), and except model 205 with CODE 483 (ADVANCED AGILITY package) and CODE 489 (AIRMATIC), and except model 253 with CODE 489 (AIR BODY CONTROL))
- Driving lights On (low beam/high beam)
Function sequence for HRA (except CODE 460 (Canada version), and except CODE 494 (USA version), and except model 205 with CODE 483 (ADVANCED AGILITY package) and CODE 489 (AIRMATIC), and except model 253 with CODE 489 (AIR BODY CONTROL))
The HRA [LWR] is installed as an item of passive safety equipment to prevent oncoming traffic from being dazzled.
The incline angle of the driving lights can be corrected by operating the headlamp range controller (S1s8).
The headlamp range controller actuates the left headlamp range adjustment actuator motor (E1m1) and the right headlamp range adjustment actuator motor (E2m1) directly.
The left headlamp range adjustment actuator motor moves the headlamp unit in the left front lamp unit.
The right headlamp range adjustment actuator motor moves the headlamp unit in the right front lamp unit.
| Electrical function schematic for driving lights actuation | PE82.10-P-2059-97FBA | ||
| Overview of exterior lights system components | GF82.10-P-9998RF |