Legal Requirement
The swivel movement of the adaptive headlight is permitted within certain limits to pro-
tect oncoming traffic, i.e. to ensure oncoming traffic is not dazzled by the headlights.
The vehicle moves on a circular path when the driver turns the steering wheel. The circu-
lar path is defined by the movement of the wheels and the angle position of the front
wheels.
In order not to dazzle the oncoming traffic, the salient point of the light/dark limit of the
headlight must not be left of the circular path at a distance corresponding to 100 times
the installation height of the headlight.
This conclusion for the light/dark limit refers to right-hand drive traffic. The conclusion
relating to the light/dark limit applies symmetrically to left-hand drive traffic.
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E70 Adaptive Headlight System
Index Explanation
1
Anticipated curve
2
Steering lock
3
Steering lock
System Circuit Diagram
6
E70 Adaptive Headlight System
System Overview
Concerning item number 5:
On vehicles with vertical dynamics management, the information relating to the vehicle
K-CAN signals at footwell module
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E70 Adaptive Headlight System
Index Explanation Index Explanation
1
Main headlight, left
7
Footwell module FRM
2
Front fog light, left
8
Junction box control unit JB
3
Front fog light, right
F-CAN
Chassis CAN
4
Main headlight, right
K-CAN Body CAN
5
Connection, ride-height sensors
LIN-Bus Local Interconnect Network bus
6
Lights operating unit
KL 30
Terminal 30
Main Headlight - Adaptive Headlight, • Side light
(1 and 4) • Low beam headlight
• High beam
• Direction indicator
• Daytime driving lights
• High beam shutter, bi-xenon
• Stepper motor, headlight vertical aim control
• Stepper motor for adaptive headlight
Lights operating unit, item number 7 • Light switch
• Fog light button
• Rear fog light button
• Manual headlight vertical aim control
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E70 Adaptive Headlight System
K-CAN Signals at the Footwell Module
In/out Information Source/sink Function
In
Road speed
Wheel speed sensor >
dynamic stability control
Calculation of anticipated curve radius in con-
nection with yaw rate
Out
A
daptive head-
light defective
S
tepper motor controller >
footwell module
Check control message in instrument cluster
Out
Fault - adaptive
headlight
Footwell module Check control message in instrument cluster
F-CAN signals at the Footwell Module
In/out Information Source/sink Function
In
Steering angle
Steering angle sensor >
steering column switch cluster
Swivel movement of adaptive headlight
In
Yaw rate
Yaw rate sensor >
dynamic stability control
Calculation of anticipated curve radius in con-
nection with vehicle speed
In
Vehicle level
VDM sensors >
vertical dynamics management
Headlight vertical aim control
Depending on the equipment configuration of the vehicle, the following system compo-
nents may be installed for the adaptive headlight function.
• Control units
– Footwell module
– Car Access System 3
– Dynamic stability control
– Rain/driving lights/solar sensor
– Roof functions center
– Vertical dynamics management
• Bi-xenon headlight
• Lights operating unit
• Direction indicator/high beam switch
• Sensor systems
– Yaw rate sensor, steering angle sensor
– Front and rear ride-height sensors
– Brake pedal switch
Control Units
The footwell module is the central control unit for the entire exterior lighting system and
therefore also for the adaptive headlight. The other control units such as the dynamic
stability control provide input signals.
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E70 Adaptive Headlight System
System Components
Control Unit Signal
Car Access System 3 Wake-up
Dynamic stability control Vehicle speed and yaw rate
Rain/driving lights/solar sensor Switch on lights when dark
Roof functions center Transfer of RLSS signal to K-CAN
Vertical dynamics management Vehicle level
Footwell Module
The control for the adaptive headlight is located in the footwell module.
The footwell module is connected to three bus systems,
The bus systems are:
• K-CAN
• F-CAN, e.g. if vertical dynamics management is installed
• LIN-bus
Data from the vertical dynamics management system are received via the F-CAN. The
footwell module receives and sends data via the K-CAN and LIN-bus.
Note: The footwell module has no gateway for the F-CAN, however, it does
have the gateway between K-CAN and LIN-bus.
Car Access System 3
The Car Access System 3 sends the wake-up signal to the control unit in the vehicle.
The steering column switch cluster is connected directly to the wake-up line.
Dynamic Stability Control
The dynamic stability control sends signals relating to the yaw rate and vehicle speed to
the adaptive headlight.
Rain/driving Lights/Solar Sensor
The rain/driving lights/solar sensor sends the request to switch on the low beam head-
lights as soon as it detects low light levels (darkness). The light switch must be set to
automatic high beam control for this purpose.
Roof Functions Center
The roof functions center receives the signals from the rain/driving light/solar sensor. The
roof functions center makes the signals available on the K-CAN.
Vertical Dynamics Management
Vertical dynamics management makes available the values for the dynamic headlight ver-
tical aim control to the footwell module.
The footw
ell module receives these values via the F-CAN. In this way the headlight range
can be adapted to the different driving situations, e.g. laden/unladen.
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E70 Adaptive Headlight System
Bi-Xenon Headlight
Each bi-xenon headlight contains following components:
• Swivel module for bi-xenon headlight
• Stepper motor controller
• Stepper motor for headlight vertical aim control
• Side light corona/daytime driving light corona
• Direction indicator
• Bi-xenon control unit
Rain/Driving Lights/Solar Sensor
The rain/driving lights/solar sensor is fitted in the mirror base. The signals from the
rain/driving lights/solar sensor are used to switch on the automatic driving lights.
Roof Functions Center
The roof functions center is the gateway for the rain/driving lights/solar sensor. It transfers
the LIN-bus signal of the rain/driving lights/solar sensor to the K-CAN.
Ultrasonic Passenger-Compartment Sensor
The ultrasonic passenger compartment sensor signals the visual alarm of the anti-theft
alarm system via the K-CAN. The visual alarm depends on the country-specific version.
Note: The ultrasonic passenger compartment sensor is integrated in the roof
functions center.
Advanced Crash Safety Management (ACSM)
The advanced crash safety management sends signals in the event of an accident. This
allows the footwell module to trigger the visual signalling (e.g. hazard warning lights ON).
Swivel Module for Bi-Xenon Headlight
Among other things, the swivel module contains following components:
• Bi-xenon lamp
• Hall sensor for zero position
• St
epper motor
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E70 Adaptive Headlight System
The bi-xenon headlight control unit is mounted on the bi-xenon headlight. It supplies the
power and ignition voltage for the bi-xenon light bulb. The bi-xenon light bulb is integrated
in the swivel section of the adaptive headlight.
The zero position Hall sensor registers the zero position of the swivel module.
The stepper motor provides the swivel movement of the swivel module. A separate step-
per motor is installed for the headlight vertical aim control.
Stepper Motor Controller
The stepper motor controller is mounted on the side of the bi-xenon headlight.
The stepper motor controller controls and monitors the movement of the stepper motors
for the adaptive headlight and the vertical aim control system.
Side Light/Daytime Driving Light
The side light/daytime driving light is designed as a fiber optics light guide ring. A 35 W
bulb (H8) supplies the light to the fiber optics ring from below.
Lights Operating Unit
The light switch must be set to automatic driving lights control in order to switch on the
adaptive headlight. The lights operating unit is connected to the footwell module.
The light switch can be pressed in at a certain pressure in forward direction. This increas-
es the impact surface area in the vicinity of the light switch in the event of an accident
thus contributing to improved passenger protection.
Direction Indicator/High Beam Switch
The steering column switch cluster contains the direction indicator/high beam switch.
The steering column switch cluster makes available the signal from the direction indica-
tor/high beam switch hard-wired to the footwell module. A more detailed description of
the steering column switch cluster can be found in the Product Information "Steering
column switch cluster E70".
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E70 Adaptive Headlight System
Sensors
Yaw Rate Sensor
The yaw rate sensor makes available signals relating to the yaw of the vehicle about the
vertical axis.
The yaw rate sensor is installed on the driveshaft tunnel between the driver's and pas-
senger's seat next to the advanced crash safety management ACSM.
Rotation Rate Sensor
The rotation rate sensors supply the signals for the vehicle speed. The dynamic stability
control evaluates the sensor of each wheel.
Steering Angle Sensor
The steering angle sensor is integrated in the steering column switch cluster. It is an opti-
cal sensor and makes available data relating to the steering wheel lock angle.
A more detailed description of the steering angle sensor can be found in the Product
Information "Steering column switch cluster E70".
Front and Rear Ride-Height Sensors
The signals of the ride-height sensors are used for the headlight vertical aim control LWR.
The ride-height sensors are connected directly to the footwell module.
Note: If vertical dynamics management is installed, the information relating to
the vehicle ride height is made available via the F-CAN.
Brake Pedal Switch
The signal of the brake pedal switch is used for the headlight vertical aim control (LWR).
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E70 Adaptive Headlight System
Bus Systems
The footwell module is connected to three bus systems, via which the adaptive headlight
receives input signals.
The bus systems are:
• Chassis-CAN F-CAN
• Body-CAN K-CAN
• Local Interconnected Network Bus (LIN-Bus)
Chassis CAN
The F-CAN is connected to the footwell module for the purpose of transferring data from
the steering angle sensor. The signal path runs from the steering angle sensor in the
steering column switch cluster via the F-CAN to the dynamic stability control, which in
turn transfers the signal to the F-CAN.
If vertical dynamics management is installed, the footwell module receives the data for the
dynamic headlight vertical aim control via the F-CAN. The data transfer rate is 500 kBd.
Body CAN
The footwell module receives information, e.g.
"Terminal 15 ON", which is important for operation of the adaptive headlight, via the K-
CAN.
The K-CAN has a data transfer rate of 100 kBd.
LIN-Bus
The LIN-bus has a data transfer rate of 19.2 kBd. It connects the stepper motor con-
trollers to the footwell module.
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E70 Adaptive Headlight System
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