GMC 2012 Terrain Owner's Manual page 192

7-32 Infotainment System
The auxiliary source is running but there is no picture or
sound.
Sometimes the wireless headphone audio cuts out or
buzzes.
The remote and/or the headphones are lost.
The DVD is playing, but there is no picture or sound.
Tips and Troubleshooting Chart (cont.)
Problem Recommended Action
Check that the RSE video screen is in the auxiliary
source mode by pressing the AUX button on the remote
control.
Check the auxiliary input connections at both devices.
Check for obstructions, low batteries, reception range,
and interference from cellular telephone towers or by
using a cellular telephone in the vehicle.
Check that the headphones are on correctly using the
L (left) and R (right) on the headphones.
Check that the headphones are positioned properly with
the headband across the top of the head.
See your dealer for assistance.
Check that the RSE video screen is sourced to the DVD
player by pressing the AUX button on the remote
control.