Mercury Mountaineer 2001 Owner's Manual page 70

Controls and features
If there is a discrepancy between the rear seat and the front audio
controls, (such as both trying to listen to the same playing media), the
front audio system will receive the desired selection.
To activate the Personal Audio
System, press the speaker/headphone
control. Press the MODE control to
change audio sources (for headphone
mode only). Use the SEEK, VOLUME
and MEMORY controls to make
adjustments to the playing media.
Adjusting the volume
Press the + control to increase
volume.
Press the - control to decrease
volume.
From the rear seat controls, volume control can be set no higher than
the current radio setting unless the speakers are turned off. Refer to
Turning speakers on and off.
70
- VOLUME +
MODE
SEEK MEMORY
- VOLUME +
MODE
SEEK MEMORY