Headlamps, Bi-Xenon

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Volvo S80, 2005 Volvo S80, 2004 Volvo S80, 2003 Volvo S80, and 2002 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Bi-Xenon Headlamps Input And Output Signals

Courtesy of VOLVO CARS OF NORTH AMERICA.

1.	Motor, high/low beam	Power supply via relay. Reconnected PWM signal provides information about the position of the reflector to the central electronic module (CEM).
2.	Motor, headlamp range adjustment	Controlled by the central electronic module (CEM) using a PWM signal.
3.	Position sensor	Inductive sensor which sends an analog signal (voltage) to the rear electronic module (REM) (Does not apply to vehicles with Four-C (Continuously Controlled Chassis Concept)). In vehicles with Four C the signal travels via the suspension module (SUM).
4.	Ballast	High voltage regulator for switch and lamp.
5.	Gas discharge lamp	Socket