Xenon headlamps
| Xenon headlamps |
The headlamp/AHL control module governs the current/voltage supply to the xenon lamp. These lamps require very high voltages (approx. 23,000 volts) before they ignite. The normal operating voltage is around 85V. The control module also governs the stepping motors for the automatic beam length adjustment. The headlamp/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 shutter which is opened for main beam use by a solenoid that is activated from the headlamp/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.
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