Xenon Headlamps

Xenon Headlamps







The headlamp contains a xenon lamp with ignition transformer, control module, beam length adjustment motor, halogen bulb and parking light bulb.

The AHL control module governs the current/voltage supply to the xenon lamp. These lamps require very high voltages (approx. 23000 volts) before they ignite. The normal operating voltage is around 85 V. The control module also governs the stepping motors for the automatic beam length adjustment. The AHL control module receives information from the front and rear load angle sensors concerning the front and rear height of the car and then adjusts the angle of the headlamps based on this information. Diagnostic communication takes place on a lead to the diagnostic tool.

Xenon lamps always light with the same brightness. The light beam from a xenon lamp is limited by a screen which is opened for main beam use by a solenoid that is activated from the AHL control module. This increases the beam of light from the lamp.

There is a halogen bulb mounted in the lamp housing. Only the halogen bulb lights up when the main beam flashers are used while the dipped beam is turned off.

The halogen bulb does not come on simultaneously with the xenon lamp for main beam on the US/CA/JP markets.

On other markets, the halogen bulb comes on together with the xenon lamp for main beam.