5 Series E60 525xd (M57T2) SAL
> not E65, E66
From 09/2007, starting with the E60, E61, E63, E64, a calibration sequence with larger range of movement
will be introduced.
The calibration sequence with larger range of movement will then gradually be introduced on other model
series.
Activation of stepper motor controllers
The control unit for adaptive headlights 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
Depending on the road speed, the adaptive headlights are controlled using the following signals: Signals from
the steering angle sensor and 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.
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
°
•
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).
Viewed from the vehicle, the right-hand headlight moves "outwards".
The left-hand headlight moves up to 8
°
(the left-hand headlight moves towards the middle of the vehicle, i.e.
"inwards" as viewed from the vehicle).
The headlight on the outside of the bend has to reach its end position at the same time as the headlight on the
inside of the bend so that the carriageway remains smoothly and 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
Until 09/2007, a system fault will be indicated by the indicator lamp on the light switch flashing.
From 09/2007 system fault will be indicated by a Check-Control message in the instrument cluster.
SBT Adaptive headlights E60, E61, E63, E64, E65, E66, E70, E81, E87, E90, E91, E92,
BMW AG - TIS
21.02.2013 11:28
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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