Jeep 2014 Grand Cherokee Owner's Manual page 365

Headphones Operation
The headphones receive two separate channels of audio
using an infrared transmitter from the video screen.
If no audio is heard after increasing the volume control,
verify that the screen is turned on, the channel is not
muted and the headphone channel selector switch is on
the desired channel. If audio is still not heard, check that
fully charged batteries are installed in the headphones.
UNDERSTANDING YOUR INSTRUMENT PANEL 363
Rear Seat Entertainment Headphones
1 — Power Button
2 — Volume Control
3 — Channel Selection Switch
4