Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Bi-Xenon Headlamp System
| 1 | Left headlamp control unit (LHCU)/Right headlamp control unit (RHCU) (vehicles with active headlamps only) | 4 | Bi-Xenon lamp |
| 2 | Motor, headlamp levelling | 5 | Internal headlamp edge |
| 3 | Lamp contact, high voltage | 6 | Motor, high and low beam |
Bi-Xenon, a headlamp system with moveable reflector, is based on gas discharge technology. The system combines high and low beam into the same lamp.
Due to legal requirements (regarding low beam) for this type of lamp, the vehicle must be equipped with automatic headlamp levelling.
Xenon vs. Halogen
Xenon:
- higher color temperature, which produces a whiter light
- better reflection of road signs and road markings
- lower power consumption (approx. 65% lower).
Good to know:
- Daylight has a color temperature of about 5000°K. The closer to natural light, the less strain on the eyes. Standard H4 bulb: 3200°K. Volvo's gas discharge bulb: about 4200°K.
- With the Bi-Xenon system, high and low beam generates the same light color. The human eye thus has an easier time adjusting to switches between high and low beam.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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