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Message: <blockquote data-quote="haywire" data-source="post: 475670" data-attributes="member: 16474">The system (LCM) pings the bulb every time we start the car to check if the bulb is working and not burnt out, with the old bulb the resistance is high, when the current passes with resistance it will tell the LCM the bulb is OK. With LED, resistance is very low, the LCM will think that the bulb is broken and there is a break in the circuit hence its giving the error message. Adding a resistor will give back the resistance that it needs. Probably works with a relay as well but I dont know how that works.New type LED bulb already includes the resistor in it.It is due to the 'ping' from the LCM that we have the 'light show' when we change from normal bulb to LED. Small current given by the LCM would not light the normal bulb due to the high current that it needs to light up, but LED will light up because it only needs a very small power to emit light briefly.Correct me if I'm wrong. We're all learners here.</blockquote>