How It Works

WARNING: This page does not describe the selected car, but rather 46 other vehicles, including the 2008 BMW M5, 2008 BMW 650i, 2007 BMW Z4, 2007 BMW M6, and 2007 BMW M5. However, it is still accessible from the selected car via links, so may be relevant.

The zero-position sensor works as follows:

Power supply from the SMC (stepper motor controller): 5 volts (+/- 10 %).
Overvoltage protection: The overvoltage protection of the zero-position sensor is located in the SMC.
Adaptation to the positioner module: The zero-position sensor is reset manually to adapt to the positioner module (end-of-production-line test by the manufacturer).
Replacement value for the zero-position sensor: if the zero-position sensor fails, the headlights are aligned with a mechanical reference point (with a tolerance of up to +/- 1°).