Headlamp Control, Function - GF82.10-P-2009KJ

MODEL 453.0/3/4 

Function requirements for driving lights actuation, 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 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 
• Function sequence for auto on/off driving lights 
• Function sequence for headlamp range adjustment, function (except code 494 (USA version)) 
• Function sequence for cornering lights (vehicles with code V07 (Front fog lamp (FFO))) 

The associated headlamp range adjustment and cornering lights functions belonging to the driving lights actuation are described in separate documents.

Additional function requirements, low beam actuation 

• Circuit 15 On

Function sequence for low beam actuation 

Turning the combination switch (S4) into the "low beams" position requests actuation of the low beams.

The driver-side SAM control unit (N10/11) reads in the status of the combination switch directly and then actuates the left low beam (E1 e2) as well as the right low beam (E2e2).

Function sequence for high beam actuation 

The high beams actuation is comprised of the following subfunctions:

• Function sequence for high beams 
• Function sequence for headlamp flasher 

Additional function requirements for high beams 

• Engine running (except model 453.091/391/491)
• Drivetrain operational ("READY" status) (model 453.091/391/491)

Function sequence for high beams 

High beam actuation is requested by pushing the combination switch forward.

The driver-side SAM control unit reads in the status of the combination switch directly and then actuates the left high beam (E1 e1) as well as the right high beam (E2e1) and makes the "High beam actuation active" status available on the interior CAN (CAN B). The center SAM control unit (N10/10) forwards the request to the instrument cluster (A1), which then actuates the high beams indicator lamp (A1 e3).

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. The high beam actuation remains active for as long as the combination switch is held in this position.

Additional function requirements for daytime running lights actuation 

• Engine running (except model 453.091/391/491)
• Drivetrain operational ("READY" status) (model 453.091/391/491)
• Rotary light switch in position:
  • Light off "0"
  • Auto on/off driving lights "AUTO"
  • Standing lights, parking lights, license plate illumination

Function sequence for daytime running lights actuation 

The "Engine running" status is provided by the ME-SFI [ME] control unit (N3/10) (except model 453.091/391/491) on the interior CAN.

The drivetrain operational "READY" status (model 453.091/391/491) is provided by the electric drive control unit (N127) on the interior CAN.

The center SAM control unit receives this status and sends the request "Daytime running lights On" via the interior CAN to the driver-side SAM control unit.

The ambient brightness is recorded by the rain/light sensor (B38/2) and transmitted to the driver-side SAM control unit.

The driver-side SAM control unit reads in the status of the combination switch directly.

The driver-side SAM control unit reads in all relevant information, evaluates it and actuates the left parking light, standing light and daytime running light (E1 e13) and the right parking light, standing light and daytime running light (E2e13).

Additional function requirements for auto on/off driving lights 

• Combination switch in "AUTO" position
• The rain/light sensor signals "Night"
• Engine running (except model 453.091/391/491) or drivetrain operational "READY" (model 453.091/391/491) or vehicle speed v > 3 km/h

Function sequence for auto on/off driving lights 

The ME-SFI [ME] control unit transmits the "Engine running" status (except model 453.091/391/491) or the electric drive control unit (model 453.091/391/491) transmits the "Drivetrain operational, READY" status via the interior CAN to the driver-side SAM control unit.

Information about the vehicle speed is made available by the Electronic Stability Program on the interior CAN.

The ambient brightness is recorded by the rain/light sensor and transmitted to the driver-side SAM control unit.

If darkness is detected, the driver-side SAM control unit activates the left low beam and right low beam.

	Electrical function schematic for driving lights actuation		PE82.10-P-2059-97BBA
	Electrical function schematic for cornering illumination	Model 453.0/3/4 with code V07 (Front fog lamps (FFO))	PE82.10-P-2061-97BBA
	Headlamp range adjustment, function	Model 453.0/3/4 except code 494 (US version)	GF82.10-P-3017KJ
	Overview of exterior lights system components		GF82.10-P-9998KJ