What is the ACC switch?

[LeMaci]

There are two types of ACC switches in cars: one is located on the ignition key switch, and the other is an independent button on the steering wheel. The ACC on the ignition key switch allows the use of auxiliary electrical equipment (such as the radio) when the car is turned off. The independent ACC button on the steering wheel is the control switch for cruise control. Generally, the car ignition switch has four positions: START, ON, ACC, and LOCK. When the car is parked and turned off, the key is in the LOCK position, where the vehicle's circuits are disconnected, and the entire car is powered off. Additionally, the steering wheel is locked. When the key is in the ACC position, some electrical devices in the car, such as the radio and audio system, are powered on, but other components remain unpowered. This is the main difference between ACC and ON. When the key is in the ON position, all components of the car, including the engine system, are powered on. The START position is for ignition; once the key is turned to START, the starter motor is powered on and begins working. The ignition switch is also known as the main switch, main power switch, or master key, serving as the main control for the vehicle's entire electrical system. It comes in two types: plug-in and rotary. There are generally two types of car cruise systems: ACC adaptive cruise control and regular cruise control. ACC adaptive cruise control includes features such as speed adjustment, following the vehicle ahead, active braking, lane-keeping, and lane departure warning with correction. Regular cruise control only has the speed-setting function. Speed adjustment function: The driver sets a desired speed. Given the complexity of traffic conditions, maintaining a constant speed is often challenging. ACC adaptive cruise control can decelerate or accelerate based on road conditions, which is the most notable difference from regular cruise control. Following the vehicle ahead: This function ensures a safe distance from the vehicle in front, which can be adjusted by the driver to maintain an appropriate gap. Active braking function: When the vehicle is in a dangerous or near-dangerous situation, the system can actively apply the brakes. Currently, this function primarily identifies hazards directly ahead and cannot accurately detect risks from the sides or rear. Lane-keeping function: This feature reduces driver fatigue by keeping the vehicle within the lane on clearly marked roads. Its introduction also marks the implementation of Level 2 driving assistance, where speed adjustment frees the driver's feet, and lane-keeping can free the driver's hands in certain scenarios. Lane departure warning and correction: On roads with clear lane markings, if the vehicle drifts and crosses a lane line, the steering wheel vibrates and emits a sound to alert the driver. If the driver does not correct the direction, the system will intervene to steer the vehicle back, enhancing safety in cases of driver fatigue or distraction. Cars have many buttons, such as window control buttons, window lock buttons, mirror adjustment buttons, and lumbar support adjustment buttons. Window control buttons: A single press can fully lower or raise the window, freeing the driver's left hand and improving convenience and safety. Higher-end models may offer one-touch control for all four windows with anti-pinch features, where the window automatically lowers if it detects an obstruction to prevent injury. Window lock button: Pressing this button locks all windows except the driver's side, preventing accidental operation by children. Some vehicles only lock the rear windows, depending on the model. Mirror adjustment button: To adjust the left mirror, move the toggle to the left and adjust accordingly, and vice versa for the right mirror. Lumbar support adjustment button: This adjusts lumbar support, typically found in high-end models. Horizontal buttons adjust the support intensity, while vertical buttons adjust the support position to suit different drivers or passengers.