Before inserting the wiring harness connectors, check the integrity of the connectors. The main inspection items are as follows: whether the positioning blocks of the waterproof connectors are in good condition, whether the unused holes are plugged with special waterproof plugs, and whether the pins have The phenomenon of bending and deformation occurs, whether the waterproof plug on the line is correctly inserted into the socket of the connector sheath (the waterproof plug should fit well with the sheath after insertion, no distortion and deformation, and prevent the connector from entering water), protect the Whether the sleeve lock buckle is damaged, etc.