hello,
I have a ML320, there are some problems:
- the buttons of heating and ventilation are not enlightened.
- remote closing does not function for the trunk.

Have ideas to repair that?

To fix the buttons just pull off the center knob, and you will see the tiny bulb (it uses a low-tech fiber optic system, a piece of clear plastic that directs light to the other two knobs). The bulb just pulls straight out. You will need a tiny pair of pliers, or a pair of tweezers to do it. Bulb can be found at any chain auto parts store, no need to go to MB for it like the "exotic" dash bulbs which are used in other spots on the truck.
Maybe someone else can help you with the trunk.

thank s for your answere ! I will test the tiny bulb today and tomorrow buy a new if he s HS !