How do you reset service light on 2000 Volvo V70XC?

You can try disconnecting the battery for about 10 minutes. You can also go to any Autozone if you have one locally and they will reset it for you for free. or, you can simply turn your key to the II position on the ignition and your indicator lights should be on. then while still in position II push your trip set button and hold till service light starts blinking,now you have reset your service light for another 7,500 miles.