8. Identify electronic modules, security systems, radios, and other accessories that require reinitialization or code entry after reconnecting vehicle battery. P-1.

           In auto 170 we learned that disconnecting the battery can cause the clock or radio stations to be reset. Using service info on AllData to do the proper manufacture protocols to store the info. Some vehicles require a special tool to keep a voltage going to the radio clock and such. Newer systems allow info to be stored and set using a obd2 scan tool.