PLEASE HELP!!! radio locked

ok i have a radio from a 99 saturn and i'm putting into my 95 saturn but it says lock on it.

i have the activation code and everything but i cant enter it. i cant get past the "lock"

i've tried everything. somone please help i just need to be able to enter the code.

i know you need to press two buttons. i tried everyt 2 button combination but that didnt work.

it is a cd/tape player from a 99 saturn

thanks

Phone a Saturn Dealer?

the two buttons i think are ether 1/2 or 3/4