GMC 1993 Suburban Owner's Manual page 159

This means the Delco@ system can receive C-QUAM@ stereo broadcasts.
Many AM stations around the country use C-QUAM@ to produce stereo,
though some do not. (C-QUAM@ is a registered trademark of
Motorola, Inc.).
If
your
Delco@ system can get C-QUAM@, your "STEREO" light will come on
when you're receiving it.
K2186
To Way the Radio
Press the PWR-VOL-TONE knob to switch the radio on and off. This knob
does two other things:
e
It controls the volume. The VOL knob increases the volume when
rotated clockwise.
The knob behind the PWR-WQL knob is the TONE knob. Rotate this
knob counterclockwise for more bass and clockwise for more treble.
TUNE Button
Press the side of the button with the down arrow to decrease the radio
frequency or the side of
the switch with the up arrow to increase the radio
frequency.
WCL Button
When the ignition is off, press the
W e b
button to display the time. With the
ignition in
RUM
or ACC, press it to recall the station frequency when the time
is showing.
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