Annoying problem...
For the last 3 months every time I get in my car I have had that 'beep' check lamps warning.
I purchased some pattern bulb holders for the rear brake/tail light and fitted them with new bulbs. Still had one light out (drivers side rear)
So I bought some holders from Mercedes again with new bulbs and still had the problem! Now, when I brake my passeneger side front sidelight comes on too. The rear drivers side brakelight still doesnt work!
Any ideas?

It's such a silly problem but one that really gets under my skin!!

DC
All lights are stock.
The front sidelight (the smaller circular lamp) comes on when I brake.
Also, does anybody know if there rear centre brakelight (in the screen) comes on with the lights? Mine does, but I do notice it gets brighter when I apply the brakes meaning there must be a double filament bulb in it.... or am I going mad....????

DC

it seems like when you changed the lamps the first time you may have grounded a wire and shorted a circuit and now may have two or more wires with insulation burned off that are crossed.Front side markers should not be lighting up when brakes are applied nor should the 3rd brake lamp be lit up when the brakes are not applied.Auto electrician time

unless you are good with a wiring diagram and a digital probe or multimeter.
think oh lord is correct on this one ..shorts somewhere. Also my display kept coming on saying bulb burnt out. All the light s were working, I talked to Mercedes and they said to check license plate and side markers and replace any questionable bulbs..it worked



