The reason why the Big Dipper automatically locks and jumps up and down is that the copper wire inside the plug is oxidized by water, which leads to failure, so the oxidized copper wire should be cut off and reconnected.
The automatic locking of the Big Dipper is also called speed-sensitive automatic locking. It is an electronic device, that is, when the vehicle speed reaches the speed set by the computer, the locking button on the door will be automatically pressed to prevent the door from being accidentally opened by mistake.