That just means that the LED has a small computer in it that it suppose to keep the computer in the car from thinking a bulb is out because you are not using a OEM bulb. Although some still dont do what their suppose to do.Thanks for the understanding. I'm looking at changing the lights in my car to LED's and their is a difference in some of the lights saying can bus. See example...
1999 Mercedes Benz E Class With Hid Headlamps Dome Light LED Lights | LED Replacement Bulbs for Cars | 12v | Super Bright LEDs
What concerns do I have when looking at these lights?