3 Series E46 316i (M43TU) SAL
automatic headlight-range adjustment;
horizontal = to the left and right for the adaptive headlights).
The positioner modules execute the movement.
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Indicator light on the light switch
The indicator light (green LED) next to the "A" (= "automatic driving lights control") is actuated by the adaptive
headlights and has 2 display functions:·
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The indicator light lights up permanently when the automatic driving lights control or adaptive headlights
function is switched on (= light switch in position "A").
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The indicator light flashes if a fault develops in the adaptive headlight system.
The indicator light thus supports diagnosis of the adaptive headlights.
The indicator light is actuated by the light switch cluster or by the light module.
System functions
The adaptive headlights system moves headlights horizontal (i.e. from left to right) in order to illuminate the inside of
a bend when cornering.
The following functions of the adaptive headlights system are described below:
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System activation and automatic calibration
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Activation of stepper motor controllers
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Speed-dependent analysis of signals
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Adjustment of headlight horizontal aim
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Deactivation of adaptive headlights function under extreme handling conditions
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Deactivation of adaptive headlights function in response to system faults
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Setting headlights to parked position
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Automatic headlight-range adjustment
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Adaptive headlights for automatic driving lights control
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Turning light
Note: Different control units for adaptive headlights.
>
E46/2, E46/C, E53 and E83 until 09/2006: AHL control unit
>
E83 from 09/2006: The adaptive headlights are actuated by the light module.
For this reason, the following text refers to the general "control unit for adaptive headlights".
System activation and automatic calibration
When terminal 15 is switched ON, the headlights always perform a calibration sequence, even if the dipped
headlights are not switched on. The control unit for adaptive headlights (AHL control unit or light module) sends
the "perform calibration sequence" prompt to the stepper motor controllers (SMCs, control unit for the headlight
stepper motors). The stepper motor controllers actuate the stepper motors in the headlights. The calibration
sequence is performed.
In the calibration sequence, the headlights move as follows:
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The headlights move to the right and the left (= calibration sequence for adaptive headlights).
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The headlights move up and down (= calibration sequence for automatic headlight-range adjustment).
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At the end of the calibration sequence, the headlights are in the straight-ahead position.
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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