Circuit allowing the transfer of all the status information needed in a car or truck over a single low-cost wire pair, minimizing electrical wire usage. It can be used to interconnect powerful functions and to control and interface car body electronics.This circuit is fully compliant with ISO standard 11519-3, supporting a wide range of applications such as low-cost remote control switches typically used for lamp control and complex, highly-autonomous, distributed systems like engine controls.It is a microprocessor-interfaced line controller for mid-to-high complexity bus-masters and listeners like injection/ignition control calculators, dashboard controllers, and car stereo or mobile telephone CPUs.