Mike, if you're asking if you need to notify as a passenger, that is something I am rather curious about myself.
Have not been pulled over yet when someone else is driving, but existing laws do not specify (in Ohio, anyways) if you must notify when a passenger.
Incorrect for Ohio. ORC 2912.16 (E) No person who has been issued a license or temporary emergency license to carry a concealed handgun under section 2923.125 or 2923.1213 of the Revised Code or a license to carry a concealed handgun that was issued to the person by another state with which the attorney general has entered into a reciprocity agreement under section 109.69 of the Revised Code, who is the driver or an occupant
of a motor vehicle that is stopped as a result of a traffic stop or a stop for another law enforcement purpose or is the driver or an occupant of a commercial motor vehicle that is stopped by an employee of the motor carrier enforcement unit for the purposes defined in section 5503.34 of the Revised Code, and who is transporting or has a loaded handgun in the motor vehicle or commercial motor vehicle in any manner, shall do any of the following :
(1) Fail to promptly inform any law enforcement officer who approaches the vehicle while stopped that the person has been issued a license or temporary emergency license to carry a concealed handgun and that the person then possesses or has a loaded handgun in the motor vehicle;