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A complete multiplex system intended primarily for Class A applications was implemented in a sub-compact car and potential wire harness reductions such as weight, number of wires, and other factors were evaluated. It was found that a multiplex system can have a considerable effect in simplifying the harness, particularly in reducing its weight.

The thermal stresses of various joints between contacts and wire conductors in Insulation Displacement Contact (IDC) connectors were calculated by the finite element method, and the life of each joint was predicted qualitatively. Next, several connectors evaluated well durable at the prediction were subjected to 1,000-hour combined environmental testing. Consequently, a highly reliable IDC connector for automotive applications was developed. Furthermore the predicted life trend of the connectors virtually agreed with the environmental test results.