GMC 2002 Envoy - Manual (Page 224)

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Diversity Antenna System
Your AM - FM antennas are located in the rear side
windows. Be sure that the inside surfaces of the rear side
windows are not scratched and that the lines on the glass
are not damaged. If the inside surfaces are damaged,
they could interfere with radio reception.
NOTICE:
Do not try to clear frost or other material from
the inside of the rear side windows with a razor
blade or anything else that is sharp. This may
affect your radio’s ability to pick up stations
clearly. The repairs wouldn’t be covered by
your warranty.
If you choose to add an aftermarket cellular telephone to
your vehicle, and the antenna needs to be attached to the
glass, be sure that you do not damage the grid lines for
the AM
- FM antennas or place the cellular telephone
antenna over the grid lines.
Chime Level Adjustment
The volume level of the vehicle’s chimes can be
controlled by the radio. To change the volume level,
press and hold pushbutton six with the ignition on
and the radio power off. The chime volume level will
change from the normal level to loud, and LOUD will
be displayed on the radio. To change back to the default
or normal setting, press and hold pushbutton six again.
The chime level will change from the loud level to
normal, and NORMAL will be displayed.