How to Reset Service Codes for a Mercedes Benz

1. Open the fuse panel cover under the steering column by turning the knob on the cover counterclockwise and pulling down on it.
2. Plug the electrical connector on the diagnostic reset tool into the input on the fuse panel. There is only one input large enough to accept the diagnostic reset tool plug.
3. Turn the ignition key to the "on" position and wait for the service light to go out. The service codes will be reset at this point.