Methods and systems of validating a vehicle safety function. In one implementation, a plurality of vehicle safety function software programs are developed. A first one of the software programs is installed in a memory of a vehicle controller. The program is run on the controller without delivering at least one vehicle actuator output of the controller generated as a result of running the program. Activation data for the safety function is recorded and the steps of installing, running, and recording with a second one of the plurality of vehicle safety function software programs are repeated.