Abstract: A method and apparatus are provided to quickly electrically test an electrical wiring system that has a large number of contacts by maximally reducing the number of electrical tests. A plurality of contacts forming a network of an electrical wiring system is divided into a plurality of groups. The respective groups are insulated from each other. The insulated states of these groups are discriminated, and the insulated states of the respective contacts in the respective groups are discriminated if the insulated states of the respective groups are judged to be satisfactory.

Abstract: An electrical connection test is conducted within a practical response time every time a harness-forming wire is connected on a compact assembling board. Multiplexing communication controllers adopting a perfect time-division multiplexing communication method according to which tokens are given to units by a time-division technique based on timing bit sets issued at specified intervals from any of the units and node addresses are provided. Every time a harness-forming wire is connected, an electrical connection of a network of a wiring harness including this harness-forming wire is tested. In this electrical connection test, whether the network is satisfactory is determined up to a last stage every time the harness-forming wire is connected in the production process of the wiring harness being tested.

Abstract: A method and apparatus are provided to quickly electrically test an electrical wiring system that has a large number of contacts by maximally reducing the number of electrical tests. A plurality of contacts forming a network of an electrical wiring system is divided into a plurality of groups. The respective groups are insulated from each other. The insulated states of these groups are discriminated, and the insulated states of the respective contacts in the respective groups are discriminated if the insulated states of the respective groups are judged to be satisfactory.

Abstract: An electrical connection test is conducted within a practical response time every time a harness-forming wire is connected on a compact assembling board. Multiplexing communication controllers adopting a perfect time-division multiplexing communication method according to which tokens are given to units by a time-division technique based on timing bit sets issued at specified intervals from any of the units and node addresses are provided. Every time a harness-forming wire is connected, an electrical connection of a network of a wiring harness including this harness-forming wire is tested. In this electrical connection test, whether the network is satisfactory is determined up to a last stage every time the harness-forming wire is connected in the production process of the wiring harness being tested.