The development of advanced driver-assistance systems (ADAS) is a global trend. One of the types of ADAS are systems that control the movement of a vehicle in a lane, preventing unintended departure from the lane. When implementing the lane keeping assist system, one of the most important functions is the implementation of external steering control. This article presents tests of the electromechanical steering system with the possibility of external control. Conducted experimental research of the developed system. Based on the test results, conclusions were made on the system’s compliance with the requirements of GOST 31507-2012, and recommendations were given on the applicability to vehicles of the GAZ Group, in particular, the lane keeping assist system.