The theft lock is on the radio and don't know how to turn it off the radio doesn't play now

just call t5he dealer where you bought it they will give you the code over the phone once you give them your vin#

by replacing the battery the anti-theft code requirement has been activated
check the radio forums and comments on this site as there are ways to recover the code

This is just a guess, but try disconnecting the battery cables for a few minutes, then reconnect them and see if you can correct it.

The radio is in theft lock, you need to enter the secuirty code that came with the car new, if you don't have that see the dealer for the problem

anti theft radios is all gm had so the code will need to be reset in yours to work again

SEC stands for security, the radio is in theft lock you must enter the unique code security that came with the car when new to unlock the radio, this SEC is triggered whenever the radio losses power like a theft or a battery disconnect. If you don't have this unique code you must see the Lexus dealer, they can look it up in the factory information link, it goes by the serial number of the radio and the VIN or the car.

This is a anti-theft device built into your radio designed to foil robbers. When the radio looses power, the radio locks up. This makes the radio worthless on the black market. The thieves know this and don't steal it as a result. Your owners manual tells you to clear the code if there will be a power loss (changing the battery). There may not be a recovery procedure.

In the GM (1995) version of this system, there is no recovery (if there were, what would be the point of the system?). I don't know the specifics of the Volvo system. You may want to talk to your dealer before you replace your radio. I am sure you will have to prove ownership of the vehicle.

Thanks for your question @ FixYa.com this morning.

You have to go to the dealership to get the theft lock code for the radio if you don't already have it. go to the parts department, tell them your need a radio code and give them your VIN. They'll probably charge you a couple bucks and turn it on for you. just make sure you right the code down for later, if you ever changer the battery again.

If you are refering to the Theft Lock code, you must first push the right sequence of radio buttons to enter the un lock mode in the radio's computer. Once the radio's Theft Lock Identifier code is displayed, you then enter the un lock code into the radio. Ususally, this is a dealer operation as they have the online program to retrieve the unlock code after they submit your Theft Lock ID code. I'm wondering how you were able to get a unlock code without the dealer's assistance.

Call your Volvo dealer with the VIN number. They can give you the code and advise if you can reset it yourself or if you will have to take it in.