Audio Systems: Buick factory radio, 2000 buick lesabre, buick lesabre

Question
I own a 2000 Buick LeSabre with a factory am/fm cass. radio. I replaced old radio with a am/ fm cass./cd factory radio from a 2000 wrecked buick lesabre. Radio shows LOC and will not repond to buttons. I tried pushing the 2 & 3 buttons and the 1&4 buttons as shown and holding the mute button on the steering wheel but nothing works.Please help. Thanks

Answer
Try this,
Press & hold the 2 & 3 buttons @ the same time for about 10 seconds; a 2 or 3 digit code will appear, write this # down,press & hold the am/fm button for about 10 seconds: another code will appear, write this # down, then call 1-888-231-0395 and tell them you need a code for the radio
there is a fee of $25.00 but is the best i seen some other sites charge 50 and $70.00 for it  they will call you back and give you the correct code
good luck