Is there a way to convert headlights from manual to automatic? - Page 2 - Mercedes Benz SLK Forum
General Modifications R170 Details that make your car different

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#21 Old 09-19-2016
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It's arrived!

Now to find a quiet weekend and strip the dashboard.

AutoHeadlamps.jpg

Auto headlights switch for when it gets dark.
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#22 Old 09-30-2016
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Looks like it might be straightforward!

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Originally Posted by savcom View Post
Auto headlights switch for when it gets dark.
I've got a few other things on my list first, but this looks like one i'd be able to do myself!

Did you have any thoughts on where you're going to put the light sensor Savcom?

Thanks Dez
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#23 Old 09-30-2016
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Originally Posted by devilman9050 View Post
I've got a few other things on my list first, but this looks like one i'd be able to do myself!

Did you have any thoughts on where you're going to put the light sensor Savcom?

Thanks Dez
Life's been busy the last few weeks (daughter getting married at end-Oct....) but I hope to get a chance to look at this on Saturday. (I'm hoping to actually DRIVE her for a change on Sunday!!) The plan is to come out between A-pillar and dash, but we'll have to see if this is possible.

I will be writing this up too, with part numbers etc. and hope to get this as a DIY thereafter.
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#24 Old 10-03-2016
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Well, I'm not quite as far as I'd like to be but we have progress. The unit is wired up and operational. The 'headlamp' is a 12V LED and the unit flips on if I hold my hand over the sensor and switches off five seconds after the sensor sees light again. if I wave my hand over the sensor so light goes on and off the sensor the LED stays lit.

Looking good. Next step is running it in the car off the 12V auxiliary power to see if the logic and sensitivity is OK.

_20161002_232025.jpg

_20161002_232045.jpg
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#25 Old 2 Weeks Ago
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Well I've been doing some research regarding the lighting controls in my SLK and it seems all the lighting is controlled by the Lighting Control Unit, N7-1. From what I can gather:

There are no relays involved because that would defeat the headlight bulb failure detection built into the N7-1.

Any relays I add to switch the lights on and off automatically will interfere with the bulb failure detection.

I would therefore need to bypass the lighting control unit to switch the headlamps on automatically yet provide a dummy load to defeat the bulb failure detection.

I also need to consider how to make sure the light switch continues to function as this will be needed at night. Also the lights would need to still comply with MOT testing policies here in the UK.

Doing this would require additional relays and load resistors and would complicate the design. I'll work out what is needed as the next step and present my design in this thread.

It may actually be better to look at other headlamp controllers from other Mercedes models to see if something can be done with a lighting control swap or looking inside the unit and adding some logic within the unit.

Happy to hear other people's views here. Have you played with the lighting control module? Have you added relays of your own?

Thanks.



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#26 Old 2 Weeks Ago
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Quote:
Originally Posted by morsim View Post
So all that is missing now is an accurate wiring diagram for the R170 headlight switch and will be a snap to do
Here is the fuse list for the fuse box on the N7-1 light module:

Fuse Box N7-1.pdf

And here is part of the N7-1 wiring showing the headlamp wiring from the module to the headlamps themselves.

Wiring.pdf

It's the wiring diagram you need - but see above - it's probably not so easy!
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