Headlamp Control, Function - GF82.10-P-2009GW
Model 463 (except 463.342)
as of model year 2013 up to model year 2019
Model 463.342
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 standing lights are active during driving lights actuation.
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 (except Japan national version)
- Function sequence for auto on/off driving lights
- Function sequence for automatic headlamp range adjustment (HRA [LWR])
Model 463 (except 463.342)
as of model year 2013 up to model year 2019
except code E11 (Blackout lighting with convoy light)
Model 463.342
except code E11 (Blackout lighting with convoy light)
The driving lights are actuated corresponding to the position of the exterior lights switch (S1). The SAM control unit (N10) directly reads in the status of the exterior lights switch (voltage-coded).
Model 463.342
with code E11 (Blackout lighting with convoy light)
The driving lights are actuated according to the position of the stealth lights rotary light switch (S1/2). The stealth lights control unit (N1) reads in the status of the stealth lights rotary light switch directly and sends it over direct lines to the SAM control unit.
Additional function requirements for low beams actuation
- Terminal 15 ON
The electronic ignition lock control unit (N73) transmits the status of circuit 15 to the SAM control unit via the interior CAN (CAN B).
Function sequence for low beam actuation
On vehicles without code E11 (Stealth lights with convoy marking), turning the exterior lights switch to the manual driving lights position requests actuation of the low beams. The SAM control unit reads in the status of the exterior lights switch directly.
On vehicles with code E11 (Stealth lights with convoy marking), turning the stealth lights rotary light switch to the low beams position requests actuation of the low beams. The SAM control unit reads in the status of the stealth lights rotary light switch from the stealth lights control unit directly.
The SAM control unit then actuates the left XENON light power supply module (E1n4) on the left front lamp unit (E1) and the right XENON light power supply module (E2n4) on the right front lamp unit (E2) directly.
The left xenon light power supply module actuates the left xenon bulb with integrated ignition module (E1e10) directly.
The right xenon light power supply module actuates the right xenon bulb with integrated ignition module (E2e10) directly.
Once the xenon bulbs have ignited, the respective xenon light power supply module actuates the burning voltage of the xenon bulb.
On vehicles without code E11 (Stealth lights with convoy marking) the SAM control unit sends the "Low beams indicator lamp ON" request over the interior CAN to the instrument cluster (A1), which then actuates the low beams indicator lamp (A1e67) directly.
On vehicles with code E11 (Stealth lights with convoy marking) the SAM control unit sends the "Low beams indicator lamp ON" request over the interior CAN, stealth lights control unit and the instrument cluster CAN (CAN IC) to the instrument cluster, which then actuates the low beams indicator lamp directly.
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 circuit 15 status over the interior CAN to the SAM control unit.
Function sequence for high beam actuation
The high beams actuation function comprises 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 this via chassis CAN 1 (CAN E1), electronic ignition lock control unit and interior CAN to the SAM control unit. The SAM control unit actuates the left high beam solenoid (E1l1) and the right high beam solenoid (E2l1) directly.
The covers that partially conceal the light cone of the xenon lamps are folded away. The entire light beam is therefore released for illuminating the road surface.
On vehicles without code E11 (Stealth lights with convoy marking) the SAM control unit sends the "High beams ON" status over the interior CAN to the instrument cluster, which then actuates the high beams indicator lamp (A1e3).
On vehicles with code E11 (Stealth lights with convoy marking) the SAM control unit sends the "High beams ON" status over the interior CAN, stealth lights control unit and the instrument cluster 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.
Since no separate high beams are installed to implement the headlamp flasher function, the xenon bulbs must be actuated when low beams actuation is not active.
If the combination switch is pulled back and held, the high beams actuation remains active for a maximum of t = 30 s. The permanently present request is then interpreted as a "stuck combination switch".
Additional function requirements for daytime running lights actuation (except Japan national version)
- "Daytime running lights" function activated in "Settings", "Light" menu in instrument cluster
- "Engine running" or "drive train ready" signal set or vehicle speed v > 3 km/h
- Exterior lights switch in position "A" (except code E11 (Stealth lights with convoy marking))
- Stealth lights rotary light switch in daytime running lights position (with code E11 (Stealth lights with convoy marking))
Model 463 (except 463.342)
as of model year 2013 up to model year 2019
except code E11 (Blackout lighting with convoy light)
Model 463.342
except code E11 (Blackout lighting with convoy light)
The instrument cluster sends the "Daytime running lights ON" request via the interior CAN to the SAM control unit.
The instrument cluster transmits the vehicle speed to the SAM control unit via the interior CAN.
The SAM control unit reads in the status of the exterior lights switch directly.
Model 463.342
as of model year 2013
with code E11 (Blackout lighting with convoy light)
The instrument cluster sends the "Daytime running lights ON" request over the instrument cluster CAN, stealth lights control unit and the interior CAN to the SAM control unit.
The instrument cluster transmits the vehicle speed to the SAM control unit via the instrument cluster CAN, stealth lights control unit and interior CAN.
The stealth lights control unit reads in the status of the stealth lights rotary light switch directly and sends it over direct lines to the SAM control unit.
The CDI control unit (N3/9) (engine 642) or the ME-SFI [ME] control unit (N3/10) (engine 157, 273) sends the "Engine running" signal or the "Drivetrain operational" signal via the chassis CAN 1, electronic ignition lock control unit and interior CAN to the SAM control unit. On vehicles with engine 176, the ME-SFI [ME] control unit sends the "Engine running" signal or the "Drivetrain operational" signal via the drive train CAN (CAN C), powertrain control unit (N127), chassis CAN 1, electronic ignition lock control unit and interior CAN to the SAM control unit.
Function sequence for daytime running lights actuation (except Japan national version)
The SAM control unit evaluates all of the relevant information and actuates the left daytime running lights headlamp (E1/3) or the right daytime running lights headlamp (E2/3) directly.
Vehicles without code E11 (Stealth lights with convoy marking):
During darkness, the SAM control unit actuates the daytime running lights headlamps with reduced power and activates the low beam actuation. The ambient brightness is recorded by the rain/light sensor (B38/2). The SAM control unit reads in the status of the rain/light sensor via the roof LIN (LIN B13). The daytime running lights actuation is deactivated as soon as the exterior lights switch is turned to the "Standing lights", "Manual driving lights", "Left parking light" or "Right parking light" position.
Model 463 (except 463.342)
as of model year 2013 up to model year 2019
except code E11 (Blackout lighting with convoy light)
Model 463.342
except code E11 (Blackout lighting with convoy light)
The daytime running lights actuation has a higher priority compared to the auto on/off driving lights.
In countries with legal daytime running light requirements, only the headlamp flasher is permissible but not the high beams. The high beams are only permissible if the driving lights are switched on manually via the exterior lights switch (with code ZU7 (Canada national version) or code ZU8 (USA national version)).
Additional function requirements for auto on/off driving lights (except code E11 (Stealth lights with convoy marking))
- "Engine running" or "drive train ready" signal set or vehicle speed v > 3 km/h
- Exterior lights switch in "A" position
The CDI control unit (engine 642) or the ME-SFI [ME] control unit (engine 157, 273) sends the "Engine running" signal or "Drivetrain operational" signal via the chassis CAN 1, electronic ignition lock control unit and interior CAN to the SAM control unit. On vehicles with engine 176, the ME-SFI [ME] control unit sends the "Engine running" or "Drivetrain operational" signal via the drive train CAN, powertrain control unit, chassis CAN 1, electronic ignition lock control unit and interior CAN to the SAM control unit.
The instrument cluster transmits the vehicle speed to the SAM control unit via the interior CAN.
The SAM control unit reads in the status of the exterior lights switch directly.
Function sequence for auto on/off driving lights (except code E11 (Stealth lights with convoy marking))
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 | ||
| 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 | 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 rain/light sensor (except code E11 (Stealth lights with convoy marking))
- Function sequence for auto on/off driving lights through wiper activities (except code E11 (Stealth lights with convoy marking))
Function sequence for auto on/off driving lights over rain/light sensor (except code E11 (Stealth lights with convoy marking))
The ambient brightness is evaluated by the rain/light sensor. The SAM control unit reads in the data of the rain/light sensor via the roof LIN and activates the low beams actuation if darkness is recognized.
Function sequence for auto on/off driving lights through wiper activities (except code E11 (Stealth lights with convoy marking))
If the low beams are switched on or off due to the activities of the windshield wiper system, one refers to wiper, rain or adverse weather light.
The SAM control unit controls the windshield wiper system and evaluates the data of the rain/light sensor or the wipe request via the combination switch for this purpose.
If the windshield wiper system is activated for t ≥ 20 s with a wipe cycle time of t < 6 s, the SAM control unit activates low beams actuation. If there are no wipe cycles for t ≥ 60 s, low beams actuation is deactivated.
In the event of any rain/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.
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 automatic headlamp range adjustment
- "Engine running" or "drive train ready" signal set or vehicle speed v > 3 km/h
- Low beam ON
Model 463 (except 463.342)
as of model year 2013 up to model year 2016
Model 463.342
up to model year 2016
The CDI control unit (engine 642) or the ME-SFI [ME] control unit (engine 157, 273) sends the "Engine running" signal or "Drivetrain operational" signal via the chassis CAN 1, electronic ignition lock control unit and chassis CAN 2 (CAN E2) to the headlamp range adjustment control unit (N71).
The instrument cluster transmits the vehicle speed via chassis CAN 2 to the headlamp range adjustment control unit.
Model 463 (except 463.342)
as of model year 2016 up to model year 2019
Model 463.342
as of model year 2016
The CDI control unit (engine 642) or the ME-SFI [ME] control unit (engine 157) sends the "Engine running" signal or "Drivetrain operational" signal via the chassis CAN 1 to the headlamp range adjustment control unit. On vehicles with engine 176, the ME-SFI [ME] control unit sends the "Engine running" signal or the "Drivetrain operational" signal via the drive train CAN, powertrain control unit and chassis CAN 1 to the headlamp range adjustment control unit.
The instrument cluster sends the vehicle speed via the chassis CAN 2, electronic ignition lock control unit and chassis CAN 1 to the headlamp range adjustment control unit.
If the function requirements have been met, the SAM control unit sends the "Switch on low beams" request via the interior CAN, electronic ignition lock control unit and chassis CAN 2 (up to 31.08.2015) or chassis CAN 1 (as of 01.09.2015) to the headlamp range adjustment control unit.
Function sequence for automatic HRA [LWR]
The automatic HRA [LWR] permits the correction of the headlamp range of the front lamp units as a function of the load or the vehicle pitch motions induced by the vehicle dynamics.
The headlamp range adjustment control unit reads in the signals of the rear axle headlamp range adjustment level sensor (A51) and the front axle headlamp range adjustment level sensor (A52) for determining the vehicle level directly and actuates the left headlamp range adjustment actuator motor (E1m1) and the right headlamp range adjustment actuator motor (E2m1) accordingly.
Zero-point programming is performed at the end of the line to compensate vehicle tolerances. Successful programming is confirmed by visual feedback by the motion sequence of the headlamps "center-down-up-center".
| Electrical function schematic for driving lights actuation | PE82.10-P-2059-97ZGA | ||
| Overview of exterior lights system components | Model 463 (except 463.342) as of model year 2013 up to model year 2019 Model 463.342 as of model year 2013 |
GF82.10-P-9998GW |