Internal roof light

[Ivinghoe]

On my C180k Classic SE 2004 WDC2030... 66000 miles, the internal roof light does not come on when the doors are opened. However, the light(s) can be manually switched on

There does not appear to be limit switches in the car doors, so uncertain as to how the internal light senses that the door is open

Any advice as to how to rectify would be appreciated

 

[EmilysDad]

I've not looked in my Merc, but the interior light of my Smart is switched in the door latch somewhere

 

[davidsl500]

Is it a 3 position switch ie., on, off and also, on with door opening?

 

[Ivinghoe]

Yes

 

[daibevan]

In mine it is a small body coloured push in switch. I'd never noticed it until I broke it closing the door on an unretracted seatbelt clip. Should give you some idea where to find it. Bought new one for just over a tenner, and an easy swap over. A new one will be black, but it's not noticeable when fitted. Youtube is your friend here.
Be aware that the internal lights don't come on unless it's dark. That caught me out. When my switch was broken it cause all sorts of electrical glitches, including not being able to lock the doors.
Try

 

[Ivinghoe]

Thanks for the various responses

Still drawing a blank, the internal roof light does not activate from any of the 4 doors

Could this be a clue as to the problem being with the electronic system in the car ?

 

[daibevan]

A bit obvious, but have you checked the bulbs, fuse, or seen if there is a current to the bulbs when the door is open? Don't forget that this circuit will only work in the dark. Could it be your light sensor? I've not heard of these failing unless you've had a new windscreen fitted, Others may know better.