(12) United States Patent ao) Patent No.: us 6,408,998 Bi
Saito et al. (45) Date of Patent: Jun. 25,2002
(52) U.S. C I 191 2
(58) Field of Search 323/282, 283,
323/285; 191/2, 3, 4, 6
(56) References Cited
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* cited by examiner
Primary Examiner—Matthew Nguyen
(74) Attorney, Agent, or Firm—Crowell & Moring LLP
(57) ABSTRACT
A power supply line is wired in a loop from a battery power supply, and a power supply relay circuit is installed intermediately of the power supply line such that power is supplied form the power supply relay circuit to an electric load connected to a terminal unit of an intensive wiring line. By this arrangement, not only wires for control signals but also wires for power supply can be reduced. The terminal unit may serve also as the power supply relay circuit.
6 Claims, 98 Drawing Sheets
