Originally Posted by Qsilver7

No...the LCM/LCM III/LCM IV controls all external lighting & the hazard flashers.


Since you're experiencing odd electrical gremlins that appear to sometimes be unrelated...have you checked your ignition switch? The iggy switch issue is more common to the e38 & e39...but the e53 is a generational cousin so could befall the same malady.



If you have the vehicle running (lights on, radio on)...pull down the passenger sun visor and open the cover to the mirror. Take note if you can get odd electrical gremlins to replicate or appear when you do this. If it does happen...then the ignition switch is more than likely the problem since all of those things get powered when the ignition is on (terminal is in KL R, KL 15, or KL 30).