Car CD players generally have a small hole the size of a toothpick. There is a contact switch in the small hole, which can be reset by pricking it with a sharp object (toothpick or paper clip). This method is the simplest and most convenient method.
Some models have a special reset key, RESET, which is also called the reset key. Because of its function, the position is generally hidden. You can also check the vehicle instruction manual, which will give a clear explanation.
Another method is to cut off the power, that is, disconnect the car battery, first disconnect the negative pole and then the positive pole. Disconnect for about 5~10 minutes. At this time, not only the CD player is reset, but also the system time, single mileage, driver driving habits, etc.
This method has certain risks, such as the alarm of the anti-theft system and the failure to start the car after ignition, so it is not recommended. And after the car owner restarts, he/she needs to make private settings that conform to his/her personal usage habits.
In addition, it should be noted that the negative pole must be disconnected first and then the positive pole, for safety reasons. The specific principle will not be introduced in detail due to space constraints, and interested friends can go online to check the information.