Did you know that the wiring harness in most modern automobiles is the second most costly item, first only by the powertrain? Diagnosing cable faults in automotive applications then becomes a very important function to help reduce cost and save time.
In my article I offer a circuit idea that provides a robust, cost-effective technique for implementing wire diagnostics on a video transmission line in automotive applications. The circuit uses an ADA4433-1fully integrated video reconstruction filter as part of the video transmission signal chain and an ADA4830-1high-speed difference amplifier as the detection circuit. The circuit can effectively detect and identify short-to-battery, short-to-ground, open-circuit, and short-circuit faults.