If the word "code" appears, you need to punch in the 4-digit code that's probably on a card in the brown plastic container with your owner's manual in your glove box. If it's missing, call any Volvo dealer service department and ask for the radio code. They'll ask you for the VIN number of the car which is at the bottom of your windshield. Then they should be able to look it up. Once you have the code, just punch it into your radio to unlock it. You need to do this every time you remove or kill your battery.-Ricardo Furioso
I had to do this on my 96 850, and no, I did not have to have it running, just on accessories on ignition.
I was told (just yesterday) by a Volvo dealership mechanic to leave the key in the on position for up to 2 hours. This applies to my 1994 940.
Your car has a special 4 digit code It is able to be reset at a Volvo dealer. They will reflash the radio code and give you a copy. Mine was that way and now I don't have problem. For steps in putting the code in look in your owners manual
3223 is the code for a sc-810
You have to take it to a Volvo dealer. They can look up the code in their database. Each radio has a unique code based on the serial number of the radio.
If you have a Volvo roiginal radio, it is likely to be produced by Alpine. Depending on your radio, different Alpine changers may fit.
The reset code is on the back of the radio,
There's no Volvo 850 2000. What you likely saw was a S70.
Go to www.the12volt.com free wiring diagrams.
need to get the security code from a licensed Volvo repair. code is by VIN.
Fix the problem and the light will go out. Normally on Volvo 850's the ABS sensor goes out (actually a wire comes loose inside the unit) this sensor is under the hood on the ABS unit.
I reset mine by removing the radio fuse and leaving it out for 3 hours before reinserting it. After reinserting the radio fuse, the radio will then accept your code unique to your radio.