Automatic Range Adjustment (Bi-Xenon)
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2009 Volvo S60, 2008 Volvo S60, 2007 Volvo S60, 2006 Volvo S60, and 2005 Volvo S60. However, it is still accessible from the selected car via links, so may be relevant.
There are two motors, one on each headlamp, which angle the headlamps upwards or downwards to control the range of the beam. The motors are on the rear of the headlamps.
The motors are controlled by signals from a position sensor at the rear axle. The sensor detects the angle of the car under different load conditions and sends this information via the rear electronic module (REM) so that the central electronic module (CEM) can determine whether the lamps need to be raised or lowered.
For further information about the inner roof lighting, see Design and Function, rear electronic module (REM).
There are diagnostics for the headlamp range adjustment.