V50 T5 AWD L5-2.5L Turbo VIN 67 B5254T7 (2008)
The light source consists of a discharge tube surrounded by a glass that filters out harmful UV radiation.
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The discharge tube is filled with a blend of chemical compounds, including the inert gas Xenon.
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An electric arch is created through an electrical discharge between two tungsten electrodes.
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Because the lamp does not have a filament, it is less sensitive to bumps and vibrations.
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Bulb designation: D1S.
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Power consumption: 35 W.
Caution! The Bi-Xenon bulb contains mercury (less than 0.5 mg), thus classifying it as hazardous waste. Hazardous waste must be handled in
accordance with national legislation. See also Volvo Car Corporation's "Waste Management Guidelines for Dealers."
Position sensor, headlamp levelling
There are two position sensors to enable automatic adjustment of the headlights. Adjustment is vertical depending on load and road conditions to reduce
the risk of blinding glare for other drivers.
One position sensor is located next to the rear axle and is connected to the left rear control arm via a link system. The other position sensor is located
next to the right front axle and is connected to the right front control arm via a link system.
Vehicle angle is measured by the sensors being actuated via the respective link system.
The position sensors are directly connected to Headlamp Control Module (HCM). Each position sensor has three connections.
Two are used for voltage feed and ground.
One is used for signals about the vehicle's angle.
In ignition position II, level control is active and an average value of the vehicle's angle is calculated using the sensors. At approx. 4 km/h, the dynamic
level control is activated, which also performs fast corrections during acceleration and braking. Speed must be above approx. 4 km/h, dark is also
required.
The position sensor can be calibrated using the diagnostic tool. The calibration is saved in the headlamp control module (HCM) and must be performed
again upon replacement of the control module or position sensor.
There are diagnostics for the position sensors.
Left headlamp control unit (LHCU)/Right headlamp control unit (RHCU) (vehicles with active headlamps only)
