This paper proposes a program execution strategy for vehicle-mounted controllers based on address selection, aiming to solve the problems of diverse controller types and difficult program maintenance amid vehicle intelligence. By collecting the grounding status of address selection lines through the controller's digital input ports and combining with the preset flags stored in EEPROM (non-volatile memory), a single program can accurately execute the corresponding function blocks in different controllers. Practical application results show that the proposed strategy reduces the number of body control maintenance programs for a specific vehicle model from 3 sets to 1 set (a 67% reduction), increases the controller reusability to 100%, and achieves 100% address recognition accuracy in 100 groups of tests without any error. The strategy effectively lowers program maintenance difficulty and hardware costs.