I had the same situation on my 99 C280, I found
two problems, the right fog/running light connection was loose and the right rear taillight bulb, the smaller one on my car, was also loose/ Fred's advice is correct, those standing lights only work with the key out. I use them at night, when parked on a street, owners manual said it help to make your car more visible at night. they will go off automatically if the battery drain gets too low as it the REST for the Hvac SYSTEM.
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