Headlamp control, function without code (614) Bi-xenon headlamp unit or without code (618) Bi-xenon headlamp - GF82.10-P-2009RC
MODEL 171.4 as of model year 09/YoM 08 model refinement package
except CODE (614) Bi-xenon headlamp unit
except CODE (618) Bi-xenon headlamps
Driving lights actuation, general The driving lights actuation includes all functions which serve the optimum illumination of the road while driving. The standing lights/parking lights actuation is active during driving lights actuation. The standing lights/parking lights actuation 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 (with code (345) Rain sensor); Headlamp range adjustment function sequence (HRA [LWR]).
Additional low beams actuation function requirements Rotary light switch (S1) in manual driving lights position
L low beam actuation function sequence The driver-side SAM control unit with fuse and relay module (N10/1) reads in the status of the rotary light switch directly and actuates the left low beams (E1e2) and the right low beams (E2e2).
Additional high beams actuation function requirements For high beams function: circuit 15R 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 The high beams actuation is requested by pressing the combination switch (S4) forward. The switch position of the combination switch is read in by the steering column tube module (N80) and transmitted via the interior CAN to the driver-side SAM control unit. The EIS [EZS] control unit (N73) provides the status of circuit 15 on the interior CAN. The driver-side SAM control unit reads in all of the relevant information, actuates the left high beams (E1e1) as well as the right high beams.
Headlamp flasher function sequence The function sequence and the signal flow of the headlamp flasher function are identical to that of the high beams function. To request the headlamp flasher function, the combination switch must be pulled backwards. The high beams actuation remains active for as long as the combination switch is held in this position.
In vehicles with 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 Function activated via the instrument cluster (only countries without legal daytime running lights specification); Engine running (circuit 61 ON) n > 300 RPM.
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. The circuit status of circuit 61 in vehicles with engine 113 or 271 is defined by the driver-side SAM control unit.
In vehicles with engine 272, the circuit status of circuit 61 is provided by the ME-SFI [ME] control unit (N3/10) on the engine compartment CAN and relayed by the central gateway control unit (N93) to the interior CAN. The driver-side SAM control unit reads in all of the relevant information, evaluates it, and actuates the low beams.
The daytime running lights have a higher priority than the auto on/off headlamps. In countries with legal requirements, only the headlamp flasher is permissible but not the high beams. The high beams are only permissible, when the driving lights are switched on manually via rotary light switch.
Additional function requirements, auto on/off headlamps Engine running (circuit 61 ON) n > 300 RPM; Rotary light switch in auto on/off headlamps position; Rain/light sensor (B38/2) (with code (345) Rain sensor) signals darkness.