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Message: <blockquote data-quote="t2ribena" data-source="post: 295761" data-attributes="member: 3847">i think you are refering to the LCM (light control module) that checks almost every single light emmiting devices on-board...the LCM basically sends a pulse/signal to the load and depending on the load impedance it 'sees' if there is any changes to the load impedance...to check for blown blub or LED required different type of signals...so if you replace the bulb with LED then the impedance is different and during checks the LED will flicker due to the pulse from the LCM...a simple remedy to the error message is to add resistor as astroboy recommended to match the impedance but the flicker requires some supression circuit...another thing is...using test light is a big no as it is a low impedance test method that loads the circuit that might cause problem to high impedance circuit especially digital circuits...a multimeter must also be used with care as its input impedance is not as high as a digital circuit impedance so it might also cause problem with the circuit or digital bus if u have no idea wat you are testing on...to DIY on bimmer's electrical and electronics components...the very first thing to get is the BMW WDS (Wiring Diagram System/Schematics)...just some info...:top:</blockquote>