What is the green dot on the Audi rearview mirror?
2 Answers
The green dot on the Audi rearview mirror is the auto-dimming switch. Here are the details: 1. Auto-dimming function: When illuminated by the headlights of a following vehicle, the interior anti-glare rearview mirror features a continuously variable anti-glare function. The interior anti-glare rearview mirror consists of a special mirror, two photodiodes, and an electronic control unit. 2. Principle: The electronic photodiodes send signals of front or rear illumination. If light is directed onto the interior rearview mirror, for example, when the rear light intensity exceeds the front light intensity, the electronic control unit outputs a voltage to the conductive layer. This voltage alters the color of the electrochromic layer—the higher the voltage, the darker the color. Consequently, even strong light directed at the rearview mirror will reflect as a dim, non-glaring light to the driver's eyes.
I've been driving an Audi for a while, and that green dot on the rearview mirror is actually the indicator light for the Blind Spot Monitoring system. Simply put, when you're changing lanes while driving, if there's another vehicle or object in the rear blind spot, the system detects it via radar sensors, and the green dot lights up to remind you not to turn the steering wheel, avoiding side-swipe accidents. I find it incredibly useful in daily driving, especially on highways or in heavy traffic. For example, last week, the green dot suddenly lit up, and when I checked the rearview mirror, sure enough, there was a car hidden in the blind spot. If it weren't for the system, I might have hit it. This system is one of Audi's standard safety features, called Blind Spot Monitoring, and it works quite sensitively. However, you need to keep the rearview mirror clean to prevent dirt from affecting the sensors. If the green dot doesn't light up or flashes abnormally, it's time to get it checked—it could be a sensor malfunction or a battery issue. All in all, it's a silent guardian that helps prevent accidents.
