After the development of automotive electronic controllers is completed, production line production is required, and the final stage of production requires functional testing of the controller. Function test bench is mainly used for production line (EOL, FCT) test, test the function of the product is qualified. Generally, the test items are defined according to the product characteristics, and the test items such as voltage, current, input, output, transmit power and receive sensitivity are tested. The test system is based on matrix relay modules and instrumentation, with a workbench and interchangeable automation fixtures. Depending on the test beat, single or multiple tests can be performed in parallel.