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Bi-Xenon Headlights

Fig 1: Identifying Bi-Xenon Headlight Communication System & Components
GLL156617Courtesy of VOLVO CARS CORPORATION
1. Motor, high/low beam Power supply via relay. Feedback PWM signal gives central electronic module (CEM) information on reflector position.
2. Motor, headlight levelling Regulated by central electronic module (CEM) via PWM signal.
3. Position sensors Inductive sensor that transmits an analogue signal (voltage) to the rear electronic module (REM) (not vehicles equipped with Four-C (Continuously Controlled Chassis Concept)). On vehicles with Four-C, the signal travels via the suspension module.
4. Ballast High voltage regulator for contact and lamp.
5. Gas discharge lamp Socket