Circuit for interfacing brake, turn, and hazard warning signals with ECM

An electric circuit interfacing a brake system of an automotive vehicle that operates vehicle brakes in response to brake application by an operator of the vehicle with both a signaling system of the vehicle that gives brake application, right turn, left turn, and hazard warning signals, and with an electronic control module of the vehicle, said electric circuit comprising in combination:

• an electronic control module comprising first and second inputs;
• a signaling system that gives brake application, right turn, left turn, and hazard warning signals;
• brake switch means that serves both said electronic control module and said signaling system and that is selectively operable to give respective brake non-application and brake application signals;
• a first feed from said brake switch means to said first input of said electronic control module for enabling said first input of said electronic control module to sense which of said brake application and brake non-application signals is being given by said brake switch means;
• slave switch means slaved to said brake switch means to be selectively operable to first and-Second switch conditions corresponding respectively to said brake switch means giving a brake non-application signal and a brake application signal respectively, said slave switch means comprising first and second controlled conductivity paths which are selectively operable to respective first and second conductivity conditions corresponding respectively to the first and second switch conditions of said slave switch means respectively;
• a second feed from said first controlled conductivity path of said slave switch means to said second input of said electronic control module for enabling said second input of said electronic control module to sense the one of said first and second switch conditions to which said slave switch means is being operated;
• and a third feed from said second controlled conductivity path of said slave switch means to said signaling system that, when said slave switch means is operated to its second switch condition by said brake switch means, enables said signaling system to give a stop signal, and that, when said slave switch means is operated to its first conductivity condition, prevents the hazard warning signal from having any effect on said second input of said electronic control module via said slave switch means.