Headlamp Control, Function - GF82.10-P-2009LFA
Model 217
Model 222
except code 640 (SAE dynamic LED headlamps, right-hand traffic)
except code 641 (Dynamic LED headlamps, left-hand traffic)
except code 642 (Dynamic LED headlamps, right-hand traffic)
Model 222 up to model year 2018 with code 640 (SAE dynamic LED headlamps, right-hand traffic)
Model 222 up to model year 2018 with code 641 (Dynamic LED headlamps, left-hand traffic)
Model 222 up to model year 2018 with 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 (without code 498 (Japan version))
- Function sequence for auto on/off driving lights
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).
During low beams actuation, the standing light actuation is active, this is described in the "Standing/parking lights actuation function" document.
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 sends the "Low beams ON" request over the interior CAN, electronic ignition lock control unit and the periphery CAN (CAN PER) to the left headlamp control unit (E1n9) in the left front lamp unit (E1) and to the right headlamp control unit (E2n9) in the right front lamp unit (E2).
In vehicles without code 640 (SAE dynamic LED headlamp for right-hand traffic and without code 641 (Dynamic LED headlamp for left-hand traffic) and without code 642 (Dynamic LED headlamp for right-hand traffic), the left headlamp control unit actuates the left low beam (E1e2). The right headlamp control unit actuates the right low beam (E2e2).
For vehicles with code 640 (SAE dynamic LED headlamp for right-hand traffic) and without code 641 (Dynamic LED headlamp for left-hand traffic) or code 642 (Dynamic LED headlamp for right-hand traffic):
- The left headlamp control unit actuates the left low beam (short range) (E1e15) and the left low beam (long range) (E1e16) via left headlamp LIN (LIN G1) and the front left actuation module, LED exterior lighting (E1n7).
- The right headlamp control unit uses the right headlamp LIN (LIN G2) and the right actuation module, LED exterior lighting (E2n7) to actuate the right low beams (short-range area) (E2e15) and the right low beams (long-range area) (E2e16).
The front SAM control unit also sends the "Low beams indicator lamp ON" request via interior CAN, electronic ignition lock control unit and user interface CAN (CAN HMI) to the instrument cluster (A1), which then actuates the low beams indicator lamp.
Additional function requirements, high beam actuation
- For function high beams circuit 15 ON (without Intelligent Light System function activated) or circuit 15 and low beams ON (with Intelligent Light System function activated)
- 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 sends the request "High beams On" to the left headlamp control unit and to the right headlamp control unit via interior CAN, electronic ignition lock control unit and periphery CAN.
For vehicles without code 640 (SAE dynamic LED headlamp for right-hand traffic) and without code 641 (Dynamic LED headlamp for left-hand traffic) and without code 642 (Dynamic LED headlamp for right-hand traffic), the left headlamp control unit actuates the left high beam (E1e1). The right headlamp control unit actuates the right high beam (E2e1).
For vehicles with code 640 (SAE dynamic LED headlamp for right-hand traffic) and without code 641 (Dynamic LED headlamp for left-hand traffic) or code 642 (Dynamic LED headlamp for right-hand traffic):
- The left headlamp control unit actuates the left high beam via the left headlamp LIN and the front left LED exterior lighting actuation module.
- The right headlamp control unit actuates the right high beam via the right headlamp LIN and the front right actuation module, LED exterior lighting.
The front SAM control unit also sends the "High beams indicator lamp ON" request via interior CAN, electronic ignition lock control unit and user interface CAN to the instrument cluster, which then actuates the high beams indicator lamp.
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 (without code 498 (Japan version))
- "Daytime running lights:" function activated in "Settings", "Light" menu in instrument cluster (except vehicles with CODE 460 (Canada version))
- "Engine running" or "Drive train ready" signal set or vehicle speed v > 3 km/h
- Exterior lights switch in "AUTO" position (in vehicles without CODE 460 (Canada version) or exterior lights switch in left parking light or right parking light position (in vehicles with CODE 460 (Canada version))
The instrument cluster sends the request "Daytime running lights ON" (as a function of the country coding or manually via the "Settings", "Light" menu activated) to the front SAM control unit via user interface CAN, electronic ignition lock control unit and interior CAN.
The "Engine running" or "Drivetrain operational" 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 drive train CAN (CAN C1), powertrain control unit (N127), chassis FlexRay, electronic ignition lock control unit and interior CAN to the front SAM control unit.
The instrument cluster sends the vehicle speed to the front SAM control unit via user interface CAN, 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 (without code 498 (Japan version))
The front SAM control unit evaluates all the relevant information and sends the "Daytime running lights ON" request via interior CAN, electronic ignition lock control unit and periphery CAN to the headlamp control units.
The left headlamp control unit actuates the daytime running lights in the left parking light, standing light and daytime running light (E1e13). The right headlamp control unit actuates the daytime running lights in the right parking light, standing light and daytime running light (E2e13). The daytime running lights actuation is deactivated as soon as the exterior lights switch is turned to the standing lights, manual driving lights or left parking light or right parking light position. For vehicles with code 460 (Canada version), the daytime running lights actuation is not deactivated in the left parking light or right parking light position. On vehicles with CODE 460 (Canada version), the daytime running lights actuation is switched off after t = 3 min with the vehicle at a standstill. When the vehicle then starts to move again, the front SAM control unit automatically activates daytime running lights actuation.
Additional function for active daytime running lights actuation (not in vehicles for China, India and Taiwan): To improve perceptibility, from a specific ambient brightness onwards, the standing lights actuation is also activated along with the daytime running lights. As it gets increasingly darker, the low beams actuation is automatically activated.
As it gets increasingly brighter, the low beams actuation and also the standing lights actuation are reversed again.
Additional function requirements for auto on/off driving lights
- "Engine running" or "drive train ready" signal set or vehicle speed v > 3 km/h
- Exterior lights switch in "AUTO" position (in vehicles without CODE 460 (Canada version) or exterior lights switch in left parking light or right parking light position (in vehicles with CODE 460 (Canada version))
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 via user interface CAN, 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
With 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 are active during the day without code 498 (Japan version) (daytime running lights active, rear fog light not activated) | |||
|---|---|---|---|
| Start of trip | Standing lamp | Daytime running lamps | Low beam |
| Circuit 15C OFF | Off | Off | Off |
| Circuit 15C ON | Off | Off | Off |
| Circuit 15R ON | Off | Off | Off |
| Terminal 15 ON | Off | Off | Off |
| "Engine running" or "drive train operational" signal set or vehicle speed v > 3 km/h | Off | On | Off |
| End of trip | Standing lamp | Daytime running lamps | Low beam |
| "Engine running" or "drive train operational" signal set or vehicle speed v > 3 km/h | Off | On | Off |
| Circuit 15R ON | Off | Off | Off |
| Circuit 15C ON (driver door closed) | Off | Off | Off |
| Circuit 15C ON (driver door open) | Off | Off | Off |
| Circuit 15C OFF | Off | Off | Off |
| Behavior of exterior lights with active auto on/off driving lights during the day with code 498 (Japan version) (daytime running lights active) | |||
|---|---|---|---|
| Start of trip | Standing lamp | Daytime running lamps | Low beam |
| Circuit 15C OFF | Off | Off | Off |
| Circuit 15C ON | Off | Off | Off |
| Circuit 15R ON | On | Off | Off |
| Terminal 15 ON | On | Off | Off |
| "Engine running" or "drive train operational" signal set or vehicle speed v > 3 km/h | On | Off | On (high beams permissible) |
| End of trip | Standing lamp | Daytime running lamps | Low beam |
| "Engine running" or "drive train operational" signal set or vehicle speed v > 3 km/h | On | Off | On (high beams permissible) |
| Circuit 15R ON | On | Off | Off |
| Circuit 15C ON (driver door closed) | On | Off | Off |
| Circuit 15C ON (driver door open) | Off | Off | Off |
| Circuit 15C OFF | Off | Off | Off |
| 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 | Off |
| "Engine running" or "drive train operational" signal set or vehicle speed v > 3 km/h | On | On (high beams permissible) |
| End of trip At the end of a trip, overlaps may occur between the auto on/o' driving lights and the headlamp switch-off delay. |
Standing lamp | Low beam |
| "Engine running" or "drive train operational" signal set or vehicle speed v > 3 km/h | On | On (high beams permissible) |
| Circuit 15R ON | On | 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 in the rain/light sensor with additional functions. The rain/light sensor with additional functions reads in the signals of the light sensor directly, evaluates them and sends the "Switch low beams on" request via rain/light sensor LIN (LIN B16) to the front SAM control unit. The front SAM control unit evaluates this request and 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.
The standing lights are active during the auto on/off driving lights actuation.
Detailed information about low beams actuation is given in the chapter "Low beams actuation".
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.
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. If the wiper startup suppression function is canceled, the auto on/off driving lights remain active for an additional t = 60 s.
Detailed information about low beams actuation is given in the chapter "Low beams actuation".
| Electrical function schematic for driving lights actuation | PE82.10-P-2059-97SEB | ||
| Overview of exterior lights system components | GF82.10-P-9998LF |