My factory installed radio locks up whenever battery is disconnected. on 2003 Chevrolet Tahoe

Problem occurs or has happened when power or battery is disconnected.

by in Birmingham, AL on May 09, 2013
2 answers
ANSWER by , May 10, 2013
That is what it is supposed to do! Got owners manual?
ANSWER by , May 10, 2013
anti theft mode normal