Error-proofing technology refers to any kind of device or facility that can prevent human error from happening, or can make people detect errors at a glance. Error-proofing, also known as fool-proofing and fool-proofing, means preventing errors before they occur. With the rapid development of automotive technology, the number of on-board functional electrical appliances has increased exponentially, resulting in increasingly large automotive wiring harnesses connecting various functional electrical appliances, especially the integrated design of automotive wiring harnesses. The manufacturability of the wiring harness is severely reduced. Therefore, the error-proof design of automobile wiring harness products and the error-proof design of process manufacturing are particularly important.