How do you turn off the service light on a Volvo s40 1999 model?

To turn off the service light on a 1999 Volvo S40, you typically need to use the trip odometer reset button. With the ignition off, press and hold the trip odometer reset button, then turn the ignition key to the "on" position without starting the engine. Continue to hold the button until the service light turns off, then release it. Finally, turn the ignition off and back on to ensure the light remains off.