Hummer 2003 H2 Owner's Manual page 213

Compact Disc Messages
ERR (Error): If this message appears on the display, it
could be for one of the following reasons:
D
You are driving on a very rough road. (The CD
should play when the road gets smoother.)
D
A CD is upside down.
D
It is dirty, scratched or wet.
D
It is very humid. (If so, wait about an hour and
try again.)
D
The CD player is very hot.
If the CD is not playing correctly, for any other reason,
try a known good CD.
If any error occurs repeatedly or if an error can't be
corrected, contact your dealer.
AM-FM Radio with Six-Disc Compact Disc
Player with Equalization and Radio Data
System (RDS) (Bose R ) (If Equipped)
Playing the Radio
PWR (Power): Push this knob to turn the system on
and off.
VOLUME: Turn the knob to increase or to decrease
volume.
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