The modern automobile electronic devices due to the increasing, the connection line number also showed a trend of increase, in order to ensure the correctness and reliability of the wires, the wire connector has played a very important role. The wire connector is a connected with a wire harness socket, all sensing terminals using a special interface, control computer ECU and the external parts of all connections are via ECU connector, and the wiring harness in the signal switching also use wire connector. This can be considered, in automotive electronic control, control computer ECU is the control center, the wire harness is control system neural network, then, the wire connector is electric line beam relay station. However, the connector not only has the advantages of convenient installation, wiring accurately, in use also often fails, and the most common faults for the bad contact resulting in a" network" of signal transmission is interrupted, a direct impact on ringing control car good performance of the play. Wire and wire and connectors connector circuit breaker failure, probably due to the conductor broken in bad contact connector.