How do you reset the service b on a 2004 sl500 Mercedes?

To reset the service indicator on a 2004 Mercedes SL500, turn the ignition key to position 2 without starting the engine. Press the gas pedal three times within 10 seconds, then turn the ignition off. When you turn the ignition back on, the service light should be reset. If it doesn't reset, you may need to repeat the process.