Ans: The safety feature will be triggered, and the car radio will be locked after battery replacement. This function helps in the prevention of unauthorized access, but it can get you into problems if used incorrectly. The radio fuse can be damaged (or) stop working if the wrong battery is inserted (or) battery is inserted incorrectly. Disconnect the car battery to check for a blown radio fuse. If you find any damaged fuses in the fuse holder, you must replace them.