The article presents the possibilities of extending the scope of periodic vehicle technical tests in the field of safety. The following mechatronic systems were analyzed: brake system with ABS / ESP together with sensors, brake assistant BAS and automatic braking system, power steering system (EPS), tire pressure monitoring system (TPMS), airbags, belts with pre-tensioners systems (SRS), system of adjusting the headlamp setting, assistant of the main beam and maintain the track.Four levels of diagnosis have been proposed allowing, in turn, to determine more precisely the condition of the system under examination. The control tests at levels I, II and III consists in reading information from the signal lamp on the dashboard of the car and the data downloaded from the self-diagnosis program of the tested system through a diagnostic tester. Level IV consists in controlling the functioning of the entire system on the diagnostic stand. The operation of the tested system is triggered by a tester through the OBD socket in the car. The effect of the system is checked on the test stand. This allows to detect those mechatronic system failures that are not detected by on-board diagnostic systems. Such a method of diagnosis causes the need to synchronize the tester program (extortion signals) with the measurements on the stand.