Scheme 263
| 1. | Ballast | 5. | Internal headlamp surround |
|---|---|---|---|
| 2. | Motor, headlamp range adjustment | 6. | Motor, high and low beam |
| 3. | Bulb connector, high tension | 7. | Moving reflector |
| 4. | Bulb |
Bi-Xenon uses gas discharge technology and is a headlamp system with moving reflectors. The system combines high and low beams in the same bulb.
It is a statutory requirement (for low beam) for vehicles with this type of bulb to be equipped with headlamps with automatic level control.
Xenon versus Halogen
Xenon
- has higher color temperature which gives a whiter light
- reflects from road signs and markings better
- has lower power consumption. (approximately 2/3).
Worth knowing
- Daylight has a color temperature of approximately 5000°K. The nearer to natural light, the easier the light is on the eye. Normal H4 bulb: approximately 3200° K. Volvos gas discharge lamp (GDL): approximately 4200° K
- The Bi-Xenon system also has the advantage of the high and low beam having the same color light. The human eye finds it easier to react between changes.
Introduction, Volvo Diagnostic
The control module has a built-in diagnostic system, Volvo Diagnostic, which continuously monitors internal functions as well as input and output signals.
Reading off the control module identification
The diagnostic tool identifies control modules by reading off a number of codes from the control module memory.
The codes contain the following information about the control module
- hardware P/N (control module without software)
- hardware serial number (control module without software)
- software P/N
- diagnostic software P/N (part of the software).