GMC Yukon Denalid Owner's Manual page 324

Battery Replacement
To change the batteries, do the following:
1. Turn the screw with a coin or screw driver to
loosen, then slide open the battery door
located on the left side of the headphones.
2. Replace the two batteries in the compartment.
Make sure that they are installed correctly,
using the diagram on the inside of the battery
compartment.
3. Replace the battery door and tighten the
door screw.
If the headphones are to be stored for a long
period of time, remove the batteries and keep them
in a cool, dry place.
324
Audio/Video (A/V) Jacks
The A/V jacks are located on the rear of the floor
console. The A/V jacks allow audio or video
signals to be connected from an auxiliary device
such as a camcorder or a video game unit to
the RSE system. Adapter connectors or cables
may be required to connect the auxiliary device to
the A/V jacks. Refer to the manufacturer's
instructions for proper usage.