How It Works
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 ride-height sensors for automatic headlight-range adjustment feature send voltage signals to the AHL control unit as follows: as the springs are compressed, the output voltage of the ride-height sensors changes linearly.