Why is the BMW X7 fuse a constant power supply?
2 Answers
BMW X7 is a constant power supply because the vehicle's functions need to operate normally even when the engine is off, such as the anti-theft system, remote control system, safety system, etc. Therefore, many fuses are constantly powered to continuously supply electricity to the car. Distinguishing electrical equipment: The electrical equipment in a car is quite complex, with various fuse specifications and strict current requirements. Car fuses are smaller than household fuses and come in different colors to indicate their amperage ratings. Generally, during the design phase, each electrical circuit in a car is assigned a threshold value, and a suitable fuse is matched accordingly. Protective function: If an issue arises with the car's electrical equipment, such as a short circuit, the fuse will quickly blow under the impact of a large current surge. This serves to alert the owner of a circuit fault and protects the related circuits, minimizing potential damage.
In the BMW X7, some fuses are live, meaning they remain powered even when the car is turned off. This is primarily for devices that require continuous power, such as memory seat positions, clock display, anti-theft alarm systems, and onboard computer storage functions. In BMW's design, these smart features must always be ready so that everything remains intact when you restart the vehicle. From my experience, BMW cars emphasize premium comfort and safety, and live power ensures the anti-theft system works at night or remote app connectivity. However, the downside is potential battery drain, especially during prolonged parking in winter, so be cautious about power leakage. If you notice a malfunction, such as the clock stopping, it might indicate a blown fuse. When checking, refer to the manual for the labeled positions. It's advisable not to tamper with the circuits yourself—visit a professional shop to avoid major issues. Overall, the design is reasonable, but maintenance must keep up.
