Circuit for interfacing brake, turn, and hazard warning signals

Details Circuit for interfacing brake, turn, and hazard warning signals Circuit for interfacing brake, turn, and hazard warning signals

1996-03-26

1997-05-13

Hofsass, Jeffery

Communications: electrical

Land vehicle alarms or indicators

External signal light system

340471, 340468, 340431, 340475, 307 108, G08B 1712

Patent

active

056296703

ABSTRACT:
A circuit interfaces a brake switch and a combination turn signal/hazard warning signal switch with a system electronic control module (ECM). The circuit is especially useful when the vehicle has an engine idle shut-down system that requires an input for distinguishing brake application from brake non-application, wherein such an input is derived from operation of the interface circuit. The circuit also employs a relay, which, along with the brake switch, the system ECM, and the combination turn signal/hazard warning signal switch, are connected such that the brake switch carries only the relay coil load, live D.C. voltage, which is independent of the position of the vehicle's ignition switch, is fed through the relay, and a hazard warning signal is prevented from having any effect on the ECM via the relay.

REFERENCES:
"Electrical Circuit Diagrams" Manual No. CTS-5122S (Jan. 1995) Navistar International Transportation Corp., 1994, pp. 30, 95.

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