Just purchased 1998 Vovlo C70 Coupe. Radio not working. Called dealership and they gave me a code that is not working. I was able to enter the code they gave me 3 times and then it says ''System Off'' I wait until it resets and asks me again for code, but code still will not unlock stereo. What now? (I have VIN#)

When it says system off that means that the radio is locked and you cannot enter in even the right code. its to prevent the code from being hacked. it used to be we would have to leave the key on and turn on the radio [engine not running] and leave it for i think it was 6 hours. of course a battery charger has to be hooked up or battery goes dead and you have to start over.
frequently the radio gets changed out while under warranty and the rebuilt replacement radio has a new code so the vin# does you no good.we used to write the code on a sticker and put it in one of the door jamns. or felt pen it on the door jamn. the previus owner should have the code or may have written it in the owners manuel.have the car lot ask the previos owner for the code if its not found.
last resort remove the radio and take it to the dealer so they can take the numbers off it and retrieve the code that way