BMW ONBOARD COMPUTER Bedienungsanleitung PDF herunterladen (Seite 31)

E46 Driver Information

XENON HIGH INTENSITY DISCHARGE BULBS

Xenon bulbs are identified as D-2S (D=Discharge).

Xenon bulbs illuminate when an arc of electrical cur-

rent is established between two electrodes in the bulb.

The xenon gas sealed in the bulb reacts to the electri-

cal excitation and heat generated by the current flow.

The distinct bluish/white brilliant light is the result of the

xenon gas reacting to the controlled current flow.

Phases of Bulb Operation:

Starting Phase: The bulb requires an initial high voltage starting pulse of 18-25kV to estab-

lish the arc.

Warm Up Phase: Once the arc is established the power supply to the bulb is regulated to

2.6A generating a lamp output of 75 watts. This is the period of operation where the xenon

gas begins to brightly illuminate. The warm up phase stabilizes the environment in the bulb

ensuring continual current flow across the electrodes.

Continuous Phase: Once the warm up phase is completed, the system switches to a con-

tinuous mode of operation. The supply voltage for the bulb is reduced and the operating

power required for continual bulb illumination is reduced to 35 watts which is less than a

conventional halogen bulb.

FUNCTIONAL DESCRIPTION

To regulate the power supply to the bulbs, additional components are required. The xenon

control modules (1 per light) receive operating power from the lighting control module (LCM

E38/E39 -- LSZ E46) when the headlights are switched on. The xenon control modules pro-

vide the regulated power supply to illuminate the bulbs through their phases of operation.

The igniters establish the electric arcs. Integral coils generate the initial high voltage start-

ing pulses from the control module provided starting voltage. Thereafter they provide a

closed circuit for the regulated power output from the control modules.

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BMW ONBOARD COMPUTER Bedienungsanleitung Seite 31