3 Series E46 316i (M43TU) SAL
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Zero-position sensor
> E46/2, E46/C
> E83
The zero-position sensor in the AHL headlight sends a signal for calculating the zero position of the AHL
headlight. This regulates the horizontal movement of the AHL headlight.
[more ...]
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Position sensor
> E53
The position sensor in the positioner module for the bi-xenon headlights supplies a signal for the horizontal
movement of the headlights.
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General module
The basic module supplies input signals with regard to the terminal management (terminal 15 ON).
The adaptive headlights control unit is activated when terminal 15 is switched ON.
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EGS control unit or reversing light switch
When reverse gear is engaged, the headlights are moved to the straight-ahead position.
On vehicles with automatic transmission, the EGS control unit (electronic transmission control) provides the
"Reverse gear engaged" signal.
On vehicles with manual transmission, the signal is supplied by the reversing light switch.
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KOMBI: Instrument cluster
The instrument cluster is the gateway, i.e. the data interface) between the PT-CAN data bus and the K-bus.
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RLS: Rain-light sensor for automatic driving lights control
The rain-light sensor measures the ambient brightness outside the vehicle.
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In twilight conditions, the rain-light sensor transmits the message "Twilight" so that the
automatic headlight-range adjustment can activate dipped headlights. The headlights are tilted up and
down as required, but they are not swivelled towards the bend in the road.
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In darkness, the rain-light sensor sends the message "Darkness". The adaptive headlights are then
activated when the vehicle is cornering. The headlights are moved to the left or the right:
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Steering-angle sensor and DSC sensor
The steering angle sensor and DSC sensor (DSC = Dynamic Stability Control) supply signals for the
adaptive headlights to the adaptive headlights control unit. These signals are evaluated as follows, depending
on the vehicle's speed:
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Vehicle speeds up to 30 km/h:
The adaptive headlights function is controlled using the information from the steering angle sensor (in the
steering column switch cluster).
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Vehicle speeds between 30 km/h and 50 km/h
:
In the 30 to 50 km/h speed range, there is a
continuous transition in signal evaluation: from the
evaluation of signals sent by the steering angle sensor to evaluation of the signals sent by the yaw-rate
sensor (in the DSC sensor).
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In extreme dynamic driving situations, e.g. if the vehicle starts to skid or fishtail, even at speeds less
than 50 km/h , the signals from the yaw-rate-sensor are considered.
If the vehicle starts to skid or fishtail, the headlights will move to the straight-ahead position. The headlights
are not moved until the vehicle has stabilised.
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Vehicle speeds over 50 km/h:
SBT Adaptive headlights E46/2, E46/C, E53, E83
BMW AG - TIS
19.01.2013 20:58
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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