What does ACC line mean?
3 Answers
ACC line is the power-on wire. The following is the relevant content about ACC line: ACC line: ACC line is the power-on wire, which means it connects to the ACC power line controlled by the key. ACC stands for Adaptive Cruise Control power in Chinese. It is generally controlled by the car key and supplies power to some components such as the car audio system. The Adaptive Cruise Control system is an intelligent automatic control system developed based on the existing cruise control technology. Functions of ACC line: ACC not only has all the functions of automatic cruise control but can also monitor the road traffic environment in front of the car through sensors such as onboard radar. When it detects other vehicles ahead in the current driving lane, it will control the car's throttle and brakes based on information such as the relative distance and speed between the car and the vehicle ahead, maintaining an appropriate safe distance between the two vehicles.
The ACC wire refers to the accessory power line in the car's ignition switch. When the car key is turned to the ACC position, this wire becomes powered, specifically designed to supply electricity to devices such as the radio, cigarette lighter, or dash cam. Its most notable feature is that it provides power without starting the engine, allowing you to listen to music or charge devices while waiting in the car without worrying about draining the battery. When installing electronic devices in the car, such as a car charger, I specifically connect it to the ACC wire to ensure automatic power-off when the engine is turned off, which is much safer than directly connecting to the battery. Some modification shops also use the ACC wire to check if devices are functioning properly, as its power supply status directly reflects the ignition switch's condition.
The ACC wire, simply put, is a dedicated power line that controls the vehicle's electrical accessories. It only powers on when the car key is turned to the ACC position. At this point, the steering wheel lock will disengage, allowing you to use the radio or charge your phone, but the engine won't start. For example, when I installed a cigarette lighter charger in my car, I specifically connected it to the ACC wire. This way, the power immediately cuts off when the car is turned off, preventing battery drain from forgotten devices. If you're wiring it yourself, it's best to locate the ignition switch harness under the steering wheel and use a multimeter to identify the wire that only powers on in the ACC position. Car audio enthusiasts know that the ACC wire can also be connected to the amplifier's control line, enabling the audio system to automatically turn on and off with the vehicle.
