What does the lock mode of a four-wheel drive vehicle mean?

[McEmersyn]

Four-wheel drive vehicle lock mode refers to the four-wheel drive being turned off. This mode is only used for special road conditions such as ice, snow, gravel, and mud, and can be used when the vehicle is stuck. During normal driving, this function must be turned off, otherwise it may cause damage to the four-wheel drive system components. If this function is turned on during normal driving, there will inevitably be a speed difference between the front and rear wheels when the vehicle turns. In this state, the four-wheel drive system will forcibly synchronize the speeds of the front and rear wheels, leading to interference in the four-wheel drive power and ultimately causing damage to the four-wheel drive system components, as well as generating noise during driving.