Why does the car key get hot?
2 Answers
The car key gets hot because the new Lavida's key comes with an anti-theft chip. When the ignition switch is turned on with the factory-matched key, the factory electronic anti-theft system automatically detects it. The magnetic coil inside the ignition switch generates heat due to magnetic field changes, causing the car key to become warm, which is a normal phenomenon. There are three main factors for the car key heating up: 1. There is a light above the keyhole: It's not an LED and has a lower color temperature, providing warmth when illuminated. Prolonged exposure causes the car key to heat up. 2. Car keys with anti-theft chips: After turning on the ignition switch with the key, the factory electronic anti-theft system automatically detects it. The magnetic coil inside the ignition switch generates heat due to magnetic field changes, causing the car key to become warm, which is normal. 3. Excessive current passing through the ignition switch: If it exceeds the maximum safe current of the static and moving contacts, the entire ignition switch's temperature rises, heating the car key. Over time and with contact wear, the temperature will continue to increase.
I've been driving for over a decade and have encountered the issue of key overheating several times, mostly due to internal malfunctions. For instance, battery aging or short circuits can cause this. Modern smart keys contain electronic chips, and prolonged button pressing can heat up the circuit board. Environmental factors also play a role; leaving the key in a car exposed to summer sun can cause the plastic casing to absorb heat and become hot. If not addressed promptly, the battery may swell, leak, and damage the key, potentially affecting remote functions. I recall one instance when my key became extremely hot, and upon inspection, it turned out to be moisture infiltration causing a short circuit. I recommend visiting an auto parts store as soon as possible for a check-up, trying a new battery, and cleaning the key slot of dust. To prevent recurring overheating issues, store your key away from high-temperature areas like the dashboard or near windows, ensuring driving safety.
