Nissan security light on 3

https://nissanintelligentkeyissueblog.silverstonebrief.com/posts/how-to-diagnose-and-fix-a-nissan-intelligent-key-issue

That little orange car with a key icon on your Nissan's dashboard is the security alarm light. When it's blinking fast or staying solid, it means your vehicle's anti-theft system is active or has detected an issue. It could be a dead key fob battery, a misread key, or a more complex sensor problem. It's not always a major fault, but if it's on while driving, it might be trying to tell you something needs attention to keep your car secure.