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.
2012 Volvo XC90 Base, AWDFACTORY OEM SERVICE PROCEDURE
Bi-Xenon Headlights
| 1. | Motor, high/low beam | Power supply via relay. Feedback PWM signal gives central electronic module (CEM) information on reflector position. |
| 2. | Motor, headlight levelling | Regulated by central electronic module (CEM) via PWM signal. |
| 3. | Position sensors | Inductive sensor that transmits an analogue signal (voltage) to the rear electronic module (REM) (not vehicles equipped with Four-C (Continuously Controlled Chassis Concept)). On vehicles with Four-C, the signal travels via the suspension module. |
| 4. | Ballast | High voltage regulator for contact and lamp. |
| 5. | Gas discharge lamp | Socket |
Factory Service Tools
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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.