Ford Mercury Villager 1997 Owner's Manual page 51

Electronic Sound Systems
Rear Seat Radio Control Operation
Rear seat radio controls (if equipped)
How to turn the rear seat radio controls on and off
Press memory preset buttons "3" and "5" simultaneously on the
face of your radio to turn the rear seat radio controls on. A
headphones symbol ( ) will appear in the display when the
rear seat controls are on. Press "3" and "5" simultaneously again
to turn rear seat radio controls off.
How to adjust the volume
Press the right (+) side of the "VOLUME" rocker switch to
increase volume, and push the left (–) side to decrease the volume
of the rear speakers.
NOTE: Rear seat control volume can be set no higher than
current radio setting.
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