GMC 2001 Savana - Manual (Page 192)

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Fixed Mast Antenna
The fixed mast antenna can withstand most car washes
without being damaged. If the mast should ever become
slightly bent, you can straighten it out by hand. If the
mast is badly bent, as it might be by vandals, you should
replace it.
Check every once in a while to be sure the mast is still
tightened to the fender. If tightening is required, tighten
by hand, then with a wrench one quarter turn.
Chime Level Adjustment
(RDS Radios Only)
The radio is one of the vehicle chime producers. The
chime is produced from the driver’s side front door
speakers. To change the volume level, press and hold
pushbutton 6 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 the pushbutton 6 again. The
chime level will change from the loud level to normal,
and NORMAL will be displayed. Each time the chime
volume is changed, three chimes will sound as an
example of the new volume selected. Chime level
adjustment is only available on RDS radios. Removing
the radio and not replacing it with a factory radio or
chime module will alter vehicle chimes.