See owner's manual pages 3-17, 3-18 and 3-19
2002 Chevrolet Avalanche Owner's Manual DOWNLOAD PDF - GReen Button on upper right
www.chevyavalanchefanclub.com
Theft-Deterrent Feature
THEFTLOCK is designed to discourage theft of your radio. It works by using a secret code to disable all radio
functions whenever battery power is removed. The THEFTLOCK feature for the radio may be used or
ignored. If ignored, the system plays normally and the radio is not protected by the feature. If THEFTLOCK
is activated, your radio will not operate if stolen. When THEFTLOCK is activated, the radio will display
LOC to indicate a locked condition anytime battery power has been interrupted. If your battery loses power
for any reason, you must unlock the radio with the secret code before it will operate.
Perhaps your THEFTLOCK was never activated?
When activated, the LED indicator by the volume control will begin flashing when the ignition is turned off.
If you lose or forget your code, contact your dealer.