3 Series E46 316i (M43TU) SAL
Following the calibration sequence, the system is ready for operation.
When reverse gear is engaged, the headlights are moved to the straight-ahead position.
Note: The calibration sequence is performed only after terminal 15 has been switched OFF for at least
15 seconds.
If terminal 15 is repeatedly switched on and off (e.g.for demonstration purposes), the calibration sequence
will not be executed every time terminal 15 is switched on. Terminal 15 must have been switched off for at
least 15 seconds before it is switched on again. Only then is a calibration sequence performed when
terminal 15 is switched on.
Activation of stepper motor controllers
The control unit·for·adaptive·headlights (AHL control unit or light module) sends the stepper motor controllers
(SMC) the nominal values for the positioner modules (position of positioner modules and speed of movement).
The control unit for adaptive headlights calculates the nominal values using the following signals:
•
Vehicle road speed
•
Steering angle (at speeds up to 50 km/h, dependent on encoding)
•
Yaw rate (50 km/h upwards, see "Steering-angle sensor and DSC sensor" above)
Speed-dependent analysis of signals
The adaptive headlights are controlled by the following signals depending on the road speed: signals from the
steering angle sensor or signals from yaw-rate sensor (in the DSC sensor). The encoding (at the end of the
production line) determines the priority assigned to sensor signals above which speed threshold (see above).
Adjustment of headlight horizontal aim
The stepper motor controllers move the headlights to the right or left when the vehicle corners.
Horizontal range of movement of headlights:
•
Inwards, i.e. towards centre of vehicle: up to max. 8
°
> E46/2, E46/C, E83: 7
°
> E53: 8
°
•
Outwards: up to max. 15
°
Example: Right-hand bend:
The right-hand headlight turns by up to 15
°
(the right-hand headlight is the "inside" headlight on a right-hand
bend).
It therefore swivels outwards away from the vehicle centre.
The left-hand headlight swivels through a maximum of 8
°
(the left-hand headlight swivels towards the vehicle
centre, i.e. inwards).
The headlight on the outside of the bend reaches its end position at the same time as the headlight on the inside
of the bend, ensuring that the road is evenly illuminated.
On a right-hand bend, the left-hand headlight is on the outside of the bend. The right-hand headlight is on the
inside of the bend.
Deactivation of adaptive headlights function under extreme handling conditions
If the vehicle drifts, skids and loses sideways grip, the adaptive headlights function is deactivated as follows:
•
The headlights are returned to the straight-ahead position. The headlights are no longer turned.
•
The dipped headlights remain on.
Deactivation of adaptive headlights function in response to system faults
In the event of a system error, the indicator light on the light switch will flash.
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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