The LED is a status indicator - there to help you... This is a very helpful little function, because you could be battling for hours trying to figure out why you can't get any communication with a controller on the bike, and in the meantime your comms line is shorted so there can't be any comms...

• Green : your GS-911 interface is powered up and all is good
• Blue : Bluetooth of course - the LED will be blue when it is communicating over Bluetooth
• Orange/Yellow : if you're getting this while the Firmware is upgrading - don't worry... that's what its supposed to do!
• Flashing Red : once you plug the device into the diagnostic plug on your motorcycle, and it flashes red, switch the ignition on and see whether it turns green - some controllers seem to take the K-line (comms line) low, when the ignition is off - if it turns green when you switch ignition on, don't fuss... If it still flashed red with ignition on, you have a shorted K-line... typically a wiring problem, but could also be a controller problem. Now go to the Setup window and press [Test Interface] this will tell you which K-line and whether it's shorted to Battery Positive or Ground.
• Alternating Red/Green flashing : This flashes when there is communication between the GS-911 interface and the motorcycle, and you are connected using the USB port.
  
• Alternating Red/Blue flashing : This flashes when there is communication between the GS-911 interface and the motorcycle, and you are connected using Bluetooth communication.