What does a key symbol on the car dashboard indicate?

[DiFrank]

When a key symbol appears on the car dashboard, it may indicate that the vehicle's anti-theft system has been triggered. Here's the relevant information: 1. With the development of the automotive industry, there are increasingly more vehicles in society. Whether it's a family car worth tens of thousands or a luxury vehicle worth millions, we rarely see news reports about car thefts. When observing vehicles parked on the roadside, we no longer find steering wheel locks that many owners used to install. 2. When the car's anti-theft system is triggered, a key symbol will appear on the dashboard. Modern car keys are no longer simple mechanical keys but integrated circuit, network, and mechanical key systems. When the signal from the key doesn't match the car's password, the vehicle system will recognize it as illegal entry, and the anti-theft system will automatically lock the engine, preventing the vehicle from starting. 3. The anti-theft system may be triggered in these situations: not using the electronic key lock button when boarding and starting the engine or using a mechanical key to open the trunk lid; opening the engine hood and reconnecting the battery terminals after disconnection; breaking into the car door to forcibly enter the vehicle; changing the vehicle's pitch angle and switching the power to IG-ON through a heating wire without operating the power switch. These situations will trigger the anti-theft system, causing the engine to be locked and unable to start.