Service Light Reseting on S80

I beleive you hold the trip od button with the ignition in the on position until the service light quits blinking. I may be wrong. I have done it. Surely someone here can be more specific.

Turn the ignition to the "I" position (accessory) hold down the trip meter reset button, and while holding it down turn the key to position "II" (don't start), and continue to hold the reset button down until the service light begins to flash.