SL/R231: Back Up LEDs




The Start/Stop button is on the dashboard to the right of the steering column.
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can be turned on in low visibility situations.
The idea is that when regular tail lights are too dimm for heavy fog, the Fog tail light can be switched on to warn oncoming cars.
I'm not 100% certain, but I think MB is using those center LED's for the fog tail light.




The rear fog lamp is located centrally between two trapezoidal exhaust tailpipes.
http://www.netcarshow.com/mercedes-benz/2013-sl-class/



