GF82.10-P-2009TM Headlamp Control, Function
GF82.10-P-2009TM Headlamp Control, Function
- except CODE (614) Bi-xenon headlamp unit
- except CODE (618) Bi-xenon headlamps
- except CODE (621) Intelligent Light System (left-hand traffic)
- except CODE (622) Intelligent Light System (right-hand traffic)
Component Identification:
Low beam actuation
Function requirements
^ Circuit 30
Function
The driver-side SAM control unit reads in the position of the rotary light switch, forwards the request over CAN-B to the front passenger-side SAM control unit and actuates the left low beam.
The front passenger-side SAM control unit actuates the right low beam.
The standing lamps remain actuated when the low beam is switched on. If the transmitter key (A8/1) is removed and the driver door opened, a lights-on warning is issued by the instrument cluster.
High-beams actuation
Function requirements
^ for high beam circuit 15R and low beam On function
^ for headlamp flasher circuit 15R On function
High beam function
Headlamps actuation is requested by pressing the combination switch forwards.
The steering column module detects the position of the combination switch and places the request on the CAN-B. The driver-side SAM control unit evaluates it, actuates the left high beam and places a corresponding signal on the CAN-B.
This signal is received by the front passenger-side SAM control unit and the instrument cluster.
The front passenger-side SAM control unit actuates the right high beam.
The instrument cluster actuates the blue high beam indicator lamp.
Headlamp flasher function
In contrast to the high beam function request, the combination switch is pulled back and held in this position. The function sequence and signal path for the headlamp flasher function are identical to the high beam function.
The high beam actuation remains active for as long as the combination switch is held in the headlamp flasher position.
Daytime running lamps actuation
Function requirements
^ Function activated in instrument cluster
^ Terminal 61 ON
Function
The instrument cluster sends the status of the daytime running lamps function over CAN-B to the following control units:
^ Driver-side SAM control unit
^ Front passenger-side SAM control unit
^ Rear SAM control unit
The daytime running lamps have a higher priority than the automatic headlamps actuation.
In countries with statutory daytime running lamp regulations, only the headlamp flasher is permitted in daytime running lamp mode, but not the high beam. High beam is only permissible if the headlamps have been manually switched on using the rotary light switch.
Actuations
^ The driver-side SAM control unit actuates the left standing lamp, the left low beam and the left front side-marker lamp (United States of America)(E6/1) as well as the right front side-marker lamp (United States of America) (E6/2).
^ The front passenger-side SAM control unit actuates the right standing lamp and the right low beam.
^ With model 211.0, the rear SAM control unit actuates the taillamps and the license plate lamps.
^ With model 211.2, the rear SAM control unit actuates the taillamps only.
^ With model 211.2, the rear-end door control unit actuates the license plate lamps.
^ With code (550) Trailer hitch, the trailer connection unit [AAG] control unit actuates the AHV socket accordingly.
Automatic headlamp actuation
Function requirements
^ Rotary light switch in "AUTO" position
^ Rain/light sensor signals darkness
Function as at start of journey:
^ Transmitter key disconnected Exterior lights Off
^ Circuit 15C Exterior lights Off
^ Circuit 15R Standing lamps ON
^ Circuit 15 Standing lamps ON
^ Terminal 61 Standing lamp/low beam On (high beam permissible)
Function as at end of journey:
^ Terminal 61 Standing lamp/low beam On (high beam permissible)
^ Circuit 15 Standing lamp/low beam On (high beam permissible)
^ Circuit 15R Standing lamps ON
^ Circuit 15C Standing lamps ON
^ Transmitter key disconnected Exterior lights Off disconnected
Function while driving
The overhead control panel control unit evaluates the rain/light sensor signals. If darkness is detected, the request is sent over CAN-B to the driver-side SAM control unit and forwarded from there to the front passenger-side SAM control unit, rear SAM control unit and, with model 211.2, to the rear-end door control unit.
On vehicles with code (550) Trailer hitch, the request is additionally detected by the trailer connection unit [AAG] control unit over CAN- B.
Function during wiper startup
Upon activation of the windshield wiper system for min. 20 s with a wipe cycle period of less than 6 s, the headlamps are switched on. If there are no wipe cycles for min. 20 s, the headlamps are switched off.
Actuations
^ The driver-side SAM control unit actuates the left standing lamp, the left low beam and the side-marker lamps (United States of America).
^ The front passenger-side SAM control unit actuates the right standing lamp and the right low beam.
^ With model 211.0, the rear SAM control unit actuates the taillamps and the license plate lamps.
^ With model 211.2, the rear SAM control unit actuates the taillamps only.
^ With model 211.2, the rear-end door control unit actuates the license plate lamps.
^ With code (550) Trailer hitch, the trailer connection unit [AAG] control unit actuates the AHV socket.
Headlamp range adjustment (HRA)
Function requirements
^ Circuit 15 ON
^ Headlamps On (low beam or high beam)
Function
The HRA [LWR] is installed as passive safety equipment to prevent any dazzling of the oncoming traffic in vehicles with halogen headlamps.
The HRA [LWR] maintains the incline angle of the headlamps dependent on the vehicle load and the position of the HRA [LWR] selector wheel (S1s8) within the legally prescribed limits.
The HRA [LWR] selector wheel can be used to select the following positions:
- With model 211.0, positions 0, 1, 2, 3
- With model 211.2, positions -1, 0, 1
Actuation of the left headlamp range adjustment motor (E1m1) and the right headlamp range adjustment motor (E2m1) is performed directly over the HRA [LWR] selector wheel via the driver-side SAM control unit.
