Here's my description, I can get a 99 SLK manual if I have to, though, we have shop copies: Turn key to "on" (yes, the door must be shut)push "0" button TWICE within a reasonable amount of seconds, the time or distance remaining (or over) will display. HOLD down the "0" button, turn the ignition off, then back on (position 2), then wait, the FSS should reset. I will try to follow up soon with the exact instructions per a 99 SLK manual......Gilly