The '99 W210/OM606.962 I just picked up has this warning message as well.

Only appears when the headlights are turned on. All of the umpteen parking light modes don't aggrivate it...so at least I know where to narrow my search.

Cheers,

Matt

On Edit:
I found that the LF marker light was out last night. For whatever reason I did not notice this before. I will replace the lamp and see if it gets rid of the dang warning message.

MB didn't think that whole system through terribly well (understatement of the day...). It's fine to warn people when lamps burn out...but don't LEAVE the warning up - obscuring the trip odo/odo, outside temp, etc. Grrr.

Edit #2:
Tonight I checked out the LF marker light and sure enough - it was bad...not just a bad connection. Replaced it with a Sylvania 'long life' (#2825, 5-watt) and now I'm good to go - no more annoying warning...until the next lamp burns out.

Edit #3:
Well - that honeymoon didn't last long. HA! After replacing the LF marker light - I got the warning message again. Now it's both license plate lights that are out. Of course, the threads on the screws holding in the vanity panel covering the light housings were slightly corroded and one of the threaded inserts just spun. Luckily I have a nut-sert tool...and a tube of anti-seize compound.

Does the system sense resistance or just that the circuit is open? I'd like to replace some of these incandescents with LED's. There are consequences of doing this obviously and I wanted to know if the system would throw errors with the LED's. I'll have to research that at some point.