Truck & Trailer Electronic Brake Systems Need Testing!

EBS Trailer Testing With ISOCheck What Is The ISO EBS Truck & Trailer Lead How does the EBS truck & trailer Susie lead work? Everyone seems to have there own ideas how it works, ranging from; "if it’s not plugged in your trailer brakes wont work", & "it’s only a back up power anyway" Both are incorrect! The truth is... The Electronic Braking System (EBS) Susie or the ISO 7638 (its correct name) is essential for the trailers Electronic Braking System (EBS) to operate correctly. So, if a truck has an ISO7638 socket a tractor and trailer must be connected with an ISO7638 Susie and the EBS must be working correctly! Also this means the EBS warning light the truck operator should be checking is in the cab and not the one on the trailer headboard (if there is one). This is where the problems start, how does the EBS lead actually work, well this is how: Pin 1 in most trucks is permanent live Pin 2 is switched ignition live Pin 3 is common return to battery negative Pin 4 is common return to battery negative Pin 5 is the warning light control (positive) Pin 6 is “CAN” High Pin 7 is “CAN” Low Pin 5 which is the warning light control wire, this pin seems to be continually misunderstood. Some people think pin 5 is controlled by the trucks EBS system or even by the truck itself, both of these are incorrect. An easy way to test the truck & trailer ISO Connection socket is the ISOCheck This simple to use tester will diagnose any pin fault in seconds, just plug it in and within 10 seconds a full pin test will identify and pin faults and by flashing the red LED’s according to which pin is faulty, example 4 flashes, pin 4 faulty. The ISOCheck can also be used continuously between a truck unit and trailer as a constant visual aide.