GMC 2002 Envoy - Manual (Page 207)

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Compact Disc Messages
(Err): If you’re driving on a very rough road or if it’s
very hot, the disc may not play and Err (error) may
appear on the display. When the road becomes smooth
or the temperature returns to normal, the disc should
play. If the disc comes out, it could be one of
the following:
D The disc is upside down.
D It is dirty, scratched or wet.
D It is very humid. (If so, wait about an hour
and try again.)
If any error occurs repeatedly or if an error can’t be
corrected, please contact your dealer.
(CAL ERR): This message is displayed when the radio
has not been calibrated properly for the vehicle. You
must return to the dealership for service.
(LOCKED): This message is displayed when the
THEFTLOCK
R
system has locked up. You must return
to the dealership for service.
AM-FM Stereo with 6-Disc Compact
Disc Player with Programmable
Equalization and Radio Data System (RDS)
(If Equipped)
Standard radio -- Bose
R
not shown
Playing the Radio
VOLUME PWR: Press this control to turn the system
on and off. To increase volume, turn the control
clockwise. Turn it counterclockwise to decrease volume.