Checking the Equipment for an Auxiliary Input

• 1). Check the radio you now have. Is it the original radio that came with the car? If it is an aftermarket radio, does it have an auxiliary input? If you are using an original radio or an aftermarket radio that does not have an auxiliary input, you will have to obtain an FM modulator. An FM modulator takes the audio from the video system and converts it into an FM signal that can be picked up by the radio. You will have to set the radio at a particular frequency to pick up the signal. The instructions for the modulator tell you what that frequency channel is. If your radio has an auxiliary input, you can add components directly to it.