Why is the car key flashing green?
3 Answers
The car key flashing green is due to a weak battery. Here is some relevant information about car keys: 1. Key anti-theft code: When a new car leaves the factory, it is usually equipped with 2 to 3 keys. At the same time, each new car comes with a configured key anti-theft code. If only one key is provided, the 4S store can query the anti-theft code for the configured key from the database based on the vehicle license and the owner's ID provided by the owner. After obtaining this code, the 4S store will require the owner to provide the key tooth shape number to configure a new metal key. 2. Lost car key: If a car key is lost, you can also call 110 or 114 for help. If you seek assistance from 110 or 114, they will transfer the call to the corresponding coordination center, which will notify a nearby or on-duty lock and key service company. A professional will immediately contact the owner to help resolve the issue.
I've noticed that a green light on the car key usually indicates normal operation. For example, when you press the unlock or lock button, the key flashes green to show the signal was successfully transmitted. Recently, while using a BMW, I observed that touching the door handle when near the vehicle also triggers a green flash, which means the keyless entry system is working. Some keys will stay lit continuously to alert you when they detect interference from nearby phones, like my colleague's Lexus often does. However, it's important to be aware of situations where the green light stays on abnormally long and the key stops functioning, as this could mean the battery is dead. Last month, after my key got soaked in water, the green light stayed on but pressing it had no effect. I had to go to the dealership and spend 500 to replace the battery before it worked again. The waterproof design of these keys is actually quite fragile, so don't forget to take them out when washing the car.
Don't panic when your car key shows a green light - it's usually just a normal operation indicator. Driving American cars taught me this: a green light when pressing the lock button means the command was successfully sent, while flashing lights during the locator function help you find your car. Just last week, I found my vehicle in the parking garage using this feature. However, if the green light stays constantly lit without responding to button presses, it's likely the coin battery (CR2035) needs replacement. It's an easy DIY fix - just buy the battery at any supermarket, use a coin to pry open the key fob casing and replace it. Remember to keep the mechanical key hidden inside safe. Modern smart keys will also illuminate green as a low-battery warning, so don't wait until complete failure - you wouldn't want to be locked out in an emergency.
