The one that comes out directly through the fuse is the constant power KL30. Each one controlled by the relay has its own logic. Generally, the ignition lock directly controls OFF, ACC, ON, and START. The one with one-key start function is controlled by the PEPS module, but they are all controlled by the PEPS module. Relay, the principle remains the same. There is a secondary power distribution behind the primary power distribution, which is generally located in the cockpit, so it is also called the cockpit power distribution box. This box is relatively small, with many fuses and few relays. Since it is secondary, the probability of bad is smaller, the accessibility design is not so good, and it is not so easy for non-professionals to find it.