Originally Posted by Roberto_Rodrigues
I know this isn't a w208 forum, but I have done this in a clk 200 kompressor (w208) a few days ago, next (maybe this weekend..) is to do the same in my r170 (slk 230 compressor).
Instead of buying a kit, like valeo, build my one, and it works like this:
1- if it's dark, and you unlock the car, with remote, it automatically turns on lights for about 10/12secs (using the timer from dome light), then it turns off itself.
2- if I'm driving and it gets darker or go in to garage, with low light, etc.., it turns on the lights.
to do this i use 3 relay's (separate lights, from right and left, and not overload the relays), several diodes (to keep all electrical apart from the car, when I switch off this system), a ldr module (like the ones showed here or can do your own, plenty of ldr diagrams on net), and a few wires.
in w208, every single lamp, have it's own wire:
one for the low light, one for the presence light, on the rear two lamps, two wires, the lights on the license plate one wire each, multiply that for 2 (left and right), one wire for the acc+, and add another wire the illuminate the cluster. For what I see r170 headlight switch, has much less wires than w208.
in my case I add two little switches so I can control how it works:
- one cuts off all this system
- the other switch only cuts off auto light when driving, and want to use headlights switch .
the headlights use positive + to work, the dome light, has always positive on, and cuts the negative, took me a while to figure out how I was going to do this, to work for both scenarios using only one light sensor, but it comes out very simply in the end.
the ldr module had a small trim pot to adjust light sensibility, I put mine inside the dome light (w208 has a big dome light compared to r170) but will go in very similar way.
Will post a scheme and some fotos (for the w208, but I will post too, when it's finished for the r170.
hope it helps more people doing this.
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