What Causes the Car Key to Light Up Red?
2 Answers
Here are the specific reasons why a car key might light up red: 1. Normal phenomenon: For some car models, pressing the key will cause a red light to turn on, such as the Arrizo 5. 2. Accompanied by the car's failure to start and the dashboard not lighting up: If the car key lights up red and the car cannot start, with the dashboard not lighting up, the red light on the key is due to the car's battery being dead. This could be caused by leaving the headlights on when locking the car, leading to battery drain. Replacing the battery can solve the problem. 3. Red backlight: It can be confirmed that the key is stained with color. If the car key cannot be used normally, it is recommended to use the mechanical key to open the car first.
Last time, the red light on my car key almost caused a mishap, so I looked into it specifically. The most common reason is that the key battery is running low, which usually happens after two or three years of use. Another situation is when the key is too close to the car body or wrapped in metal objects, affecting signal transmission—a colleague of mine encountered this. If the light still comes on after replacing the battery, it might be due to improper installation or reversed polarity. Special terrains like high-voltage power lines or mining areas can also trigger the indicator due to interference. It’s advisable to carry a spare button battery for emergencies. When replacing it yourself, make sure to choose the correct model and avoid prying the casing forcefully. If all else fails, visit a 4S shop to check the motherboard—they have equipment to diagnose signal issues. Regularly inspecting the key’s waterproofing is also important, as humid environments can easily lead to internal short circuits.
