BMW 528i Headlamps
Common Symptoms of BMW 528i Headlamps and How to Diagnose Them
The component that lets you see the road ahead of you while driving at night or under low-visibility conditions is the pair of BMW 528i headlamps at the front of your car. Without these, you are more likely to get into an accident at night. Because the headlamps are important to your safety, it's crucial to always be on alert for the times they show signs of problems. Here are some of their symptoms.
One headlamp does not work
If one of your car's headlamps is not working while the other is just fine, then this usually means that the bulb in that problem component has burned out. Just like the other light sources, headlamp bulbs have a limited lifespan, depending on the number of hours you used it. So the more often you drive at night and under low-visibility conditions, the sooner either or both headlamps will fail. A typical incandescent bulb-halogen or regular-has a lifespan ranging from 600 to 2,000 hours of use.
Both headlamps do not work
If both headlamps suddenly stopped working at the same time, there are few possible reasons:
- The fuse might be blown. Check the one belonging to the headlamps and replace if needed.
- There might be a problem with the headlamp relay or module. If your car's system uses a relay, pull it out and shake it. If anything inside rattles, replace the relay. If your car has a module, check if it's getting power when the headlamp switch is on. If it does but the lamps are still not working, then the module is faulty.
- The high-beam/low-beam switch might be bad. Check if your headlamp relay or module still receives voltage when the switch is turned on. If it's not getting electricity, then the switch is your problem.
Symptom #3: Dim headlamps
If you notice your headlamps are dimmer than before, or if you think that the headlamps' brightness changes when you rev up your engine, try these troubleshooting tips:
- Test each headlamp assembly function to see which ones have this problem. Treat the whole assembly as just one component since one problem with just one function could affect the others.
- Inspect the headlamp for condensation that may be building up inside its housing.
- Check the charging voltage while the engine is idling. If the voltage is at 13.5 to 14.5 volts, then the system is okay. If it is lower than 13 volts, then there is something wrong with the system.