THEFTLOCK® is designed to discourage theft of the radio. This feature requires no user input to be activated. It is automatically armed with the radio is installed in the vehicle for the first time. When the radio is turned off, the blinking light indicated that THEFTLOCK® is armed. This is normal operation. When THEFTLOCK® is activated, the radio will display LOCKED and a solid red light will go on next to the THEFTLOCK® logo. This indicates that the radio is in a locked condition and will not operate if stolen. If this occurs, the radio will have to be returned to the dealer.