It won't fry the lights but it may not work either. The system is designed to work with incandescent lamps and not LEDs. To use a brake light as a tail light requires the LCM to modulate the voltage going to the brake lamps, in effect running it a lower voltage, simulating a lower wattage lamps (21W vs 5W). Modulating the voltage on the LEDS won't dim them - it will simply make them flicker.

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Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)