Xenon headlamps, design/function - GF82.10-P-2007A

MODEL 129, 140, 210 with CODE (612b) Xenon headlamp unit 

Illustration shows model 210 

Xenon headlamps 

The xenon light arc chamber is filled with xenon and a mixture of metal halogenide salts. The arc is struck by high voltage. The color of the light is similar to daylight.

Function 

When the low beams are switched on the xenon headlamp control module (E1n1, E2n1) activates the xenon headlamp ignition module (E1n2, E2n2) via the control module within a few milliseconds.

The xenon lamp ignites due to a high voltage surge (approx. 20 kV) from the ignition module striking an electric arc between the electrodes. When an arc of sufficient stability is recognized the electronic circuitry in the control modules (E1n2, E2n2) switches over to operation with limited power.

The electric power is regulated to 35W. A voltage converter generates the required voltage of approx. 85 V (~) for safe function of the xenon lamp. Due to technical reasons xenon lamps require a starting time. 50 % of the brightness is reached immediately after switching on, the full brightness is reached after approx. 30 seconds.

Xenon lamp 

There are two different xenon lamp versions. They are used as follows:

D2R for models 140, 210

D2S for model 129

Diagnosis 

Diagnosis is possible with the Diagnosis Manual. See Diagnosis Manual "Body", Volume 1, Chapter 1.