In-Vehicle Entertainment System Operation; Dvd Player Controls - Honda in-Vehicle Entertainment System Operating Instructions Manual

AUDIO SYSTEM
Turning on the FM Modulator will enable you to listen to audio from the in-VEHICLE ENTERTAINMENT SYSTEM over the vehicle's
speakers. To turn on the FM Modulator, press and hold the AUX button on either the Remote Control or DVD Player.
NOTE: The wireless headphones remain operational regardless of the status of the FM Modulator. You must tune the vehicle's audio
system to 88.5MHz (See NOTE) on the FM band to hear the audio.
WHILE THE FM MODULATOR IS TURNED ON, IT WILL NOT BE POSSIBLE TO LISTEN TO OTHER RADIO STATIONS.
NOTE: 88.5 MHz is the recommended and factory set frequency for the FM Modulator. Installers may use 88.1 MHz or 88.9 MHz
instead of 88.5 MHz if there is interference on that frequency. Please try these other frequencies if you experience no audio on 88.5 MHz.