How do you turn off the airbag light on the right side of a 1999 volvo s80?

According to the manual, that warning light will illuminate if a fault is detected. Normally, the SRS warning lamp should light up when the ignition key is turned to positions I, II or III and should
go out after 7 seconds or when the engine is started.

· If the SRS (Supplemental Restraint System) warning light stays on after the engine has started or if it comes on while you are driving,
drive the car to the nearest authorized Volvo retailer for inspection as soon as possible.

Hope this helps.