GF82.10-P-2009CA Headlamp Control, Function
GF82.10-P-2009CA Headlamp Control, Function
- except CODE (615) Bi-xenon headlamp unit with integrated curve illumination
- except CODE (616) Bi-xenon headlamp unit with integrated asymmetrical curve illumination
- except CODE (621) Intelligent Light System (left-hand traffic)
- except CODE (622) Intelligent Light System (right-hand traffic)
Function requirements, driving lights actuation, general
No overvoltage or undervoltage (operating voltage range U ≥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 a separate document.
The driving lights actuation function is comprised of the following subfunctions:
^ Low beam actuation function sequence
^ High beam actuation function sequence
^ Daytime running lights actuation function sequence
^ Auto on/off headlamps function sequence
^ Headlamp range adjustment function sequence (HRA [LWR])
The driving lights are actuated corresponding to the position of the exterior lights switch (S1). The status of the exterior lights switch is read by the front SAM control unit with fuse and relay module (N10/1) in model 207.3 up to 31.5.10 via instrument panel LIN (LIN 1) and in model 207.3 as of 1.6.10, model 207.4 (voltage-coded) directly.
Additional low beams actuation function requirements
^ Circuit 15 ON
Low beam actuation function sequence
Turning the exterior lights switch to the "Manual driving lights" position requests actuation of the low beams.
The electronic ignition lock control unit (N73) transmits the circuit status of circuit 15 to the front SAM control unit via the interior CAN (CAN B).
The front SAM control unit reads in the status of the exterior lights switch and then actuates the left low beams (E1e2) as well as the right low beams (E2e2) in a pulsed manner.
It additionally transmits the request "Low beams indicator lamp On" via interior CAN to the instrument cluster (A1), which then actuates the low beams indicator lamp (A1e67).
Additional function requirements, high beam actuation
^ For high beams function: Circuit 15 and low beams On
^ For headlamp flasher function: Circuit 15R On
High beam actuation function sequence
The high beams actuation is comprised of the following subfunctions:
^ Function sequence for high beams
^ Headlamp flasher function sequence
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 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, uses it to generate the request "High beams On", transmits it via interior CAN to the instrument cluster and actuates the left high beams (E1e1) and the right high beams (E2e1). The instrument cluster actuates the high beams indicator lamp (A1e3).
Headlamp flasher function sequence
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. However, if the combination switch is pulled back permanently, 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".
In vehicles with code (460) Canada version or code (494) USA version, the high beams may not be actuated at the same time as the left front fog lamp (E5/1) and the right front fog lamp (E5/2).
The current incoming request has priority.
Additional function requirements, daytime running lights actuation
^ "Daytime running lights" function activated in "Settings", "Light" menu in instrument cluster (except vehicles with code (460) Canada version)
^ Engine running (n > 300 rpm) or circuit 61 On or vehicle speed v > 3 km/h
^ Exterior lights switch in position:
- Exterior lights Off "0" or
- "Left parking lights" or "Right parking lights" (model 207.3 up to 31.5.10) (can be coded) or
- Auto on/off headlamps "AUTO"
Daytime running lights actuation function sequence
The request for the daytime running lights function is output depending on the country coding or activated manually by the instrument cluster on the interior CAN.
Status of circuit 61 and the engine speed are transmitted by the CDI control unit (N3/9) (with diesel engine) or the ME-SFI [ME] control unit (N3/10) (with gasoline engine) via chassis CAN. The instrument cluster transmits the vehicle speed via interior CAN.
The front SAM control unit reads in all relevant information, evaluates it and actuates the left daytime running light (E1/3) and right daytime running light (E2/3) on vehicles without code (498) Japan version. In vehicles with code (498) Japan version, the low beams are actuated in order to output the daytime running lights function because daytime running lights headlamps are not installed.
When it is dark, the front SAM control unit, in vehicles without code (498) Japan version, switches off the daytime running lights headlamps and activates the low beams actuation. In the process, the ambient brightness is recorded by the rain/light sensor (B38/2). The front SAM control unit reads in the data of the rain/light sensor via wiper/inside rearview mirror LIN (LIN 2).
The daytime running lights actuation is deactivated as soon as the exterior lights switch is turned to position "Standing lights", "Manual driving lights" or "Left parking light" or "Right parking light" (model 207.3 as of 1.6.10, model 207.4).
On vehicles with code (460) Canada version, the daytime running light actuation is switched off after expiration of a time interval of t = 3 min when the vehicle is standing still. When the vehicle then starts to move again, the front SAM control unit automatically activates daytime running 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, auto on/off headlamps
^ Engine running (n > 300 rpm) or circuit 61 On or vehicle speed v > 3 km/h
^ Exterior lights switch in position "AUTO" or "0" (model 207.3 up to 31.5.10) (can be coded)
^ Rain/light sensor signals "Darkness detected"
Auto on/off headlamps function sequence
The auto on/off headlamps function is no more than a convenience system and does not exempt the driver from following the operating instructions in the road traffic regulations.
With auto on/off headlamps, low beam actuation is switched on or off depending on the ambient brightness. The auto on/off headlamps function can be switched on or off via the rain/light sensor or the activities of the wiper system.
Journey commencement:
- Transmitter key Standing lights/low beams OFF
(A8/1) removed
- Circuit 15C ON Standing lights/low beams OFF
- Circuit 15R ON Standing lights ON
- Circuit 15 ON Standing lights ON
- Engine is running or Standing lights/low beams ON
Circuit 61 On or (high beams permissible)
v > 3 km/h
End of journey:
- Engine is running or standing lights/low beams ON
Circuit 61 On or (high beams permissible)
v > 3 km/h
- Circuit 15R ON Standing lights ON
- Circuit 15C ON Standing lights ON
- Transmitter key Standing lights/low beams OFF
disconnected
The standing lights are switched off as soon as the driver door is opened with the transmitter key (circuit 15C) inserted.
The CDI control unit or the ME-SFI [ME] control unit transmits the circuit 61 status and the engine speed via chassis CAN.
The instrument cluster transmits the vehicle speed via interior CAN.
The ambient brightness is recorded by the rain/light sensor. The front SAM control unit reads in the data of the rain/light sensor via wiper/inside rearview mirror LIN
If darkness is recognized the front SAM control unit actuates the low beams.
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 beam actuation is deactivated.
Auto on/off headlamps switch-off conditions:
In the event of 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 suppression function is canceled, the auto on/off headlamps function remains active for an additional t = 60 s.
Additional headlamp range adjustment function requirements
^ Driving lights On (low beam/high beam)
Headlamp range adjustment (HRA [LWR]) function sequence
The headlamp range adjustment is installed as passive safety equipment in vehicles fitted with halogen headlamps to prevent them from dazzling oncoming traffic. Depending on the load condition of the vehicle, the incline angle of the driving lights can be corrected by actuating the headlamp range controller (S1s8).
The left headlamp range adjustment actuator motor (E1m1) and the right headlamp range adjustment actuator motor (E2m1 ) are actuated voltage-coded in accordance with the position of the headlamp range adjuster. These then adjust the headlamp units in the front lamp units.
