5 Series E61 523i (N52) TOUR
the adaptive headlights function.
A number of control units are involved in the adaptive headlights system (see above: CAS, EGS, SZL).
Depending on the model series and model version concerned, the adaptive headlights are actuated by the following
control units:
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AHL: Adaptive headlights
> E60, E61, E63, E64, E65, E66 up to 03/2005
The AHL control unit actuates the adaptive headlights.
For safety reasons, the AHL control unit is also responsible for the automatic headlight-range adjustment. This is
because: Oncoming traffic must not be dazzled by the adaptive headlights. If a headlight sticks in an
unfavourable position, the AHL control unit will attempt to move this headlight down (using the stepper motors in
the automatic headlight-range adjustment).
The AHL control unit is connected to the PT-CAN.
[more ...]
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LM: Light module
> E60, E61, E63, E64, E65, E66 from 03/2005
From 03/2005, the AHL control unit is integrated in the light module.
The light module (LM) controls and monitors all vehicle lights. Information is transmitted and received via the K-
CAN data bus.
The light module actuates the indicator light for the adaptive headlights (on the light switch).
[more ...]
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FRM: Footwell module
> E70, E81, E87, E90, E91, E92, E93
The footwell module controls the exterior lighting and the adaptive headlights.
The footwell module thus takes the place of the light module and the AHL control unit.
The footwell module actuates the indicator light for the adaptive headlights (on the light switch).
[more ...]
The footwell module has its own system description.
[For more information, please refer to SI Technology (SBT) 61 04 04 094]
"Footwell module".
The following additional control units are involved in the adaptive headlights:
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SMC: Stepper motor controllers
The stepper motor controllers control the stepper motors in the headlights (for the automatic headlight-range
adjustment and for the adaptive headlights). The stepper motor controllers are not capable of self-diagnosis.
The stepper motor controllers are diagnosed and encoded via the control unit for adaptive headlights.
[more ...]
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SGM: Safety and gateway module
> E60, E61, E63, E64 until 09/2005 and E65, E66
The safety and gateway module (SGM) is the interface between the two data buses K-CAN and PT-CAN. Thus,
all information exchanged between the light module and the AHL control unit passes through the SGM.
Information from the yaw-rate sensor (in the DSC sensor) is also fed through the SGM to the AHL control unit.
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KGM: Body gateway module
> E60, E61, E63, E64 from 09/2005
The vehicle electrical system was changed from 09/2005.
As a result of the change, several control units were discontinued and some control unit functions were
integrated into new control units.
SBT Adaptive headlights E60, E61, E63, E64, E65, E66, E70, E81, E87, E90, E91, E92,
BMW AG - TIS
06.02.2013 01:12
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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