GF82.10-P-2009SXA Headlamp Control, Function
GF82.10-P-2009SXA Headlamp Control, Function
- with CODE (615) Bi-xenon headlamp unit with integrated curve illumination
Component Identification:
Low beam actuation
Function requirement
^ Circuit 30
Function
The upper control panel control unit reads in the position of the rotary light switch over the UCP [OBF] LIN and places the request on the interior CAN.
The front SAM control unit receives the request and forwards it directly over circuit 56b to the xenon headlamp control units. The xenon headlamp control units then actuate the relevant bixenon light.
High-beams actuation
Function requirements
- for high beam function, circuit 15R and low beam On
- for headlamp flasher function, circuit 15R On
High beam function
The high beam actuation is requested by pressing the combination switch forward.
The steering column module detects the switch position of the combination switch and transmits the request over the chassis CAN to the central gateway control unit. It is then sent from here to the front SAM control unit over the interior CAN. The front SAM control unit actuates the high beam solenoids, whereby the partially covered light cones of the bi-xenon lights are completely released. In addition, on vehicles without code (610) Night View Assist, the high beams are actuated.
For vehicles with code (610) Night View Assist, the left infrared lamp (E1e11) is installed instead of the left high beam and the right infrared lamp (E2e11) instead of the right high beam.
The status message "high beam actuation active" is transmitted by the front SAM control unit over the interior CAN to the central gateway control unit. The central gateway control unit then forwards it to the central CAN.
The instrument cluster receives the status message and then actuates the high beam indicator lamp.
Headlamp flasher function
In contrast to the request for the high beam function, the combination switch is pulled to the rear and held there.
The function sequence and signal path for the headlamp flasher function is the same as for the high beam function.
The high beam actuation remains active as long as the combination switch is kept in the headlamp flasher switch position.
If the low beam function is switched off on vehicles with code (610) Night View Assist, the bi-xenon lights are switched on and the high beam solenoids actuated accordingly, because infrared lamps are installed instead of high beams.
Daytime running lamps actuation
Function requirements
- Function activated via instrument cluster
- Terminal 61 ON
Function
The daytime running lamps function is activated by the front SAM control unit. The front SAM control unit makes the request available on the interior CAN and at the same time actuates the front standing lights and, via the xenon headlamp control units, the bi-xenon lamps.
The daytime running lights have a higher priority than the auto on/off headlamps.
In countries with statutory daytime running lamp regulations, only the headlamp flasher is permitted in daytime running lamp mode, but not the high beam. The high beam is only permissible when the driving lights are manually switched on using the rotary light switch.
Automatic headlamp actuation
Function requirements
- Rotary light switch in "AUTO" position
- Rain/light sensor signals darkness
Function at start of journey:
- Transmitter key disconnected Exterior lights (ABL) Off
- Circuit 15C Exterior lights (ABL) Off
- Circuit 15R Standing lamps ON
- Circuit 15 Standing lamps ON
- Terminal 61 Standing light/low beam On (high beam permissible)
Function at end of journey:
- Terminal 61 Standing lights/low beam On (high beam permissible)
- Circuit 15R Standing lamps ON
- Circuit 15C Standing lamps ON
- Transmitter disconnected key Exterior lights (ABL) Off
Function while driving
The overhead control panel control unit evaluates the signals from the rain/light sensor. When darkness is detected, the request is forwarded over the interior CAN to the front SAM control unit. The front SAM control unit sends the request to activate the standing lights to the interior CAN and actuates the front standing lights and the bi-xenon lights over the xenon headlamp control units.
Wiper startup function
When the windshield wiper system is activated for min. 20 s with a wipe cycle of less than 6 s, the driving lights are switched on. If there is no wipe cycle for at least 20 s, the driving lights are switched off.
Automatic headlamp range adjustment (HRA [LWR])
Function requirements
^ Circ. 15 ON
^ Driving lights On (low beam/high beam)
Function
The automatic headlamp range adjustment (HRA [LWR]) serves to correct the headlamp range of the vehicle headlamps as a function of the load or the vehicle pitch motions induced by the vehicle dynamics.
For model 221 without code (487) Active Body Control (ABC), the data of the left front level sensor (B22/8), right front level sensor B22/9) and the rear axle level sensor (B22/3) are read in by the AIRmatic with ADS control unit (N51), evaluated and made available on the chassis CAN.
For vehicles with code (487) Active Body Control (ABC), the data of the left front level sensor, right front level sensor, left rear level sensor (B22/7) and the right rear level sensor (B22/10) are read in by the ABC control unit (N51/2), evaluated and made available on the chassis CAN.
Information on vehicle speed is made available by the ESP control unit (N47-5) on the chassis CAN.
The information is made available by the central gateway control unit to the xenon headlamp control unit at the left front lamp unit (E1) over the front end CAN.
The xenon headlamp control unit processes all the information and forwards the corresponding correction data to the xenon headlamp control unit at the right front lamp unit (E2). The xenon headlamp control units actuate the left headlamp range adjustment motor (E1m1) and the right headlamp range adjustment motor (E2m1) accordingly.
Both xenon headlamp control units operate in a master-slave combination, whereby the xenon headlamp control unit at the left front lamp unit has the role of the master control unit.
