*Also to your question, yes, you're on the right track.

The "canbus" is nothing but a capacitor or resistor that will hold the amperage there to make the sensor/computer "think" the bulb is using the right voltage/amperage/wattage.

And this applies to both HID and LED.

If the LED fails, (which had happened to my SLK), it had displayed a bulb out warning, and the bulb would start flashing. Same thing had happened to the HID when the bulb didn't have the good/constant contact to the ballast.