How do you unlock the radio? on 2002 Buick Rendezvous

We had to change the battery and now the radio says locked on it. How do we unlock the radio?

Asked by for the 2002 Buick Rendezvous
What is the code to unlock the radio
2 more answers , 2 more comments
I need the code to unlock my radio
Wen the vehicle was bought new there should have been a card along wih the owner's manual and guarantee information with the radio code in it. The code is entered using the stereo preset buttons . On some Acura, Honda, Mitsubishi and VW you have to remove the radio from the car to get the chassis number of the radio in order to obtain the radio code from the dealer.
Call your dealer and ask if they can give you the radio code if you give them the vehicle VIN number and prove your identity.
I have a Buick 2002 n I got the code for the stereo but I don't know how to put it on the radio
do you have the code? my radio has locked on me and I purchased my car used there was no card and Buick wants to charge me 125 which i am really not willing to pay