Signal Path For Adaptive Headlights Calibration Sequence
WARNING: This page does not describe the selected car, but rather 37 other vehicles, including the 2006 BMW 330Ci, 2006 BMW 325Ci, 2005 BMW M3, 2005 BMW 330xi, and 2005 BMW 330i. However, it is still accessible from the selected car via links, so may be relevant.
The calibration sequence is always performed when terminal 15 is switched on (light switch in position "0" or "2" (dipped beam headlights) or in position "A", for example).
Signal path:
GM -> K bus -> LSZ and AHL -> LIN -> SMC (basic module -> body bus -> light switch cluster and adaptive headlights -> local bus -> stepper motor controller)
NOTE:
The calibration sequence is performed only after terminal 15 has been switched OFF for at least 15 seconds. If terminal 15 is switched on and off repeatedly (e.g. for demonstration reasons), the headlights are not calibrated each time terminal 15 is switched on. Terminal 15 must have been switched off for at least 15 seconds before it is switched on. Only then is a calibration sequence performed when terminal 15 is switched on again.
NOTE:
AHL = ALC The development designation for adaptive headlights was "ALC", which was the abbreviation for "Adaptive Light Control".
The marketing and sales designation for option 524 in English-speaking countries is "adaptive headlights", abbreviated to "AHL".
In fault-diagnostics contexts and in technical documentation, the system is referred to as "adaptive headlights" and the abbreviation "AHL" used for the control unit.
However, some control units are still marked "ALC".