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.
I had to do this on my 96 850, and no, I did not have to have it running, just on accessories on ignition.
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.
Look at http://www.volvoclub.org.uk/tech/service/850/WiperWasherSystem.pdf It says it all for a 850!
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.
The Volvo 850 has two horns in front of the radiator, lift the hood and their they are.
There's no 2.0L. Volvo 850 engine. Only 2.3L. & 2.4L. ...