A method for preparing an in-vehicle device includes monitoring a communication bus for one or more messages. The method also includes determining if at least one of the one or more messages corresponds with a message in a list of messages indicative of a change in vehicle state. Data is extracted from the at least one message that corresponds with the message in the list of messages. A signal is transmitted to the in-vehicle device based on the extracted data. A vehicle system that implements the method is also disclosed herein.