For the electrical appliances with weak signals, the grounding position is preferably independent, and the arrangement position is close to the electrical appliances to ensure the true transmission of the signal. For the battery negative wire harness and the power unit ground wire harness with large cross-sectional area, it is necessary to control the position of the ground wire, reduce the length of the wire, and control the direction of the wire harness in order to reduce the voltage drop. For other electrical appliances without special requirements, a shared ground can be adopted according to the specific layout location of the ground and the particularity of the functional requirements. Although the number of electronic control units in the new automotive electronic and electrical architecture has been reduced, and the total number of grounding points of the entire vehicle wiring harness has decreased, it should be noted that the “signal-” of some sensors is not directly connected to the electronic control equipment, and should be considered in the grounding design. The specificity of the sensor.