Diconnected battery and don't have the code

Have you run a fault code test with a code reader?

If you enter the wrong code x (4?) number of times the radio locks itself out. After one hour you can try again, whether the car has been on or not. After the one hour interval you get ONE chance to do it right or it locks up again for one more hour.
The manual specifically tells you how to input the code and you need to follow those directions to the letter. I thought I had a post here that explained it in great detail but I've searched and searched and cannot find it.

the radio most likely has a security code activated & until you reactivate the code the radio will not work, you may have to take it to a place where they install radios to get the problem sorted out.........hope this helps........cheers,

when power is diconnected from your car, the radio will ask for a code. this is part of the anti theft system of your car. inside your owners manuel case, there should be a slip with the code on it.( hope its there) input this into your radio. if its not allowing you, disconnect the battery, and reconnect. this should allow you to input the code sequence.

You probably need to reset the security system to get the car to start. Try taking the key out of the ignition and locking the doors using the remote. Wait about 1 minute for the alarm to finish arming itself then unlock again with the remote and try to start it. The err mesage may be gone now, but if not, you may have to get your radio repaired.

You will need to turn the ignition to the number 1 position and turn the radio on. It can take several hours, but the word code should come back on. When that happens, you will need to put the correct code in. If you don't have it, a Volvo dealer can give you the correct code from your VIN.

If you don't have the code (usually entered by original owner) you will need to go to a gm dealer and they can unlock it for you. Usually costa about $50.

this code u speak of must display on radio. diconnect battery for 10 min and reconnect if it does not correct problem remove radio completely and wait approx 10 then reinstall

first try diconnecting the battery for 10 sec then re enter the security code

yikes. the only way to get the code is by taking it to the dealer.$$$$$ it may be cheaper getting a new radio. call dealer to get a price. sorry.