The "procedure" is for resetting the "maintenance" reminder message which is a simple "alarm" based on mileage/time since last reset
If you have a service light on that is most likely indicating there is an issue which requires some attention. You will have to read the codes to determine the issue is, fix it, and then reset the warning if it doesn't go out by itself.
Although some generic OBD readers can grab some Volvo codes, you'll get definitive results with a VIDA/DICE setup.
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