GMC 2002 Savana Van Owner's Manual page 185

Compact Disc Messages
CHECK CD: If this message appears on the radio
display, it could be due to one of the following reasons:
D
The road is too rough. The disc should play when the
road is smoother.
D
The disc is dirty, scratched, wet or upside down.
D
The air is very humid. If so, wait about an hour and
try again.
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. If your radio displays an
error message, write it down and provide it to your
dealer when reporting the problem.
3-46
Theft-Deterrent Feature RDS Radios
(If Equipped)
THEFTLOCK R is designed to discourage theft of your
radio. The feature works automatically by learning a
portion of the Vehicle Identification Number (VIN).
If the radio is moved to a different vehicle, it will not
operate and LOCKED will be displayed.
When the radio and vehicle are turned off, the blinking
red light indicates that THEFTLOCK is armed.
With THEFTLOCK activated, your radio will not
operate if stolen.
Theft-Deterrent Feature Non-RDS Radios
(If Equipped)
THEFTLOCK R is designed to discourage theft of your
radio. The feature works automatically by learning a
portion of the Vehicle Identification Number (VIN).
If the radio is moved to a different vehicle, it will not
operate and LOC will be displayed.
With THEFTLOCK activated, your radio will not
operate if stolen.