Why is the car headlamps often fire line
There are often FireWire, that is, relay control side of the terminal chant!
Hello this is the negative control circuit hope my answer can help you, what questions you can continue to ask me, I wish you a happy car.
The FireWire is powered by a 12V or 24V lead-acid battery on the car, regardless of whether the car key is always powered. The headlamps are pre-boot safety assist, especially at night, so before the key is inserted Or start the car can also open the headlamps before the lighting, so then the direct fire line can be directly switch control, not subject to key constraints.
