Help with retrofitting auto lights

[Somerandomguy]

Has anyone done this mod and could provide some advice?
I have fitted the sensor (i used 4e0955559a) , changed the light switch and run a wire down to the central electric module and powered it from the roof module.

Now, the auto wiper function works great, but the DIS always throws an error that the sensor is faulty when I put it into auto lights.

Do I have a dodgy sensor? (If so then wouldn't the wipers also not work) or have I missed something out.

This is on a 2004 D3, and I did note that the circut diagrams only refer to the sensor as a rain sensor, not rain and light, but that may be a red herring....


Thanks

[Architex_mA8tey]

Maybe there were 2 different sensors available - one for auto lights plus wipers and one just for auto wipers - they would be two different sensors as one would be a light sensor and the other a sensor to detect rain on the glass

[tc4332]

My eyes are not fully open yet, and I have to take SWMBO to Salford Quays for some market she spotted.
Quick lok at page 29 on the diagram does show two sensors, a humidity one and a light one.
Sorry due to high levels of earache no time to dig any deeper

[snapdragon]

I think 4e0955559a is just for rain - what about the light sensor below it?

[Somerandomguy]

I did wonder if the part is just for rain only, but ETKA does describe it as a rain and light sensor.

My understanding is that the rain sensor detects changes in light reception caused by drops of water on the screen in front of it - so it makes sense that it's both at the same time, but who knows. I also have read (can't remember where I read it now), that the other light sensors are used for the dimming mirrors, and this still works fine.

Has anyone else done this update?

[snapdragon]

Originally Posted by Somerandomguy

I did wonder if the part is just for rain only, but ETKA does describe it as a rain and light sensor.

My understanding is that the rain sensor detects changes in light reception caused by drops of water on the screen in front of it -

It works by using a ring of maybe 5 or 7 tiny IR LEDs at 45˚ to the glass in the sensor.
In the middle is an IR sensor that measures the reflected light.
There is also a dark red IR filter.
When it rains and the droplets settle within the ring, IR light escapes from the surface so the sensor sees a corresponding drop in IR level and adjusts the wiper interval.

I thought the headlight sensor was (as viewed from outside through the windscreen) on the bottom of the mirror mount housing and looks like a clear 5mm ball inside a hole but you are right about it being called rain and light... but maybe that is for autodimming mirrors.
http://www.partscats.info/audi/en/?i...ail_id=1243121
It does seem common to have rain light in one...
http://www.trw.com/sites/default/fil...tsensor_en.pdf

Did you find in VCDS the part where you choose subsystem in a popup menu > REGENLICHTSENSORH11?
and can see options for different glass types and security glass (disabled)?

Address 09: Cent. Elect. Labels: 4E0-910-279.LBL
Part No SW: 4E0 910 279 Q HW: 4E0 907 279 Q
Component: ILM Fahrer H14 0230
Coding: 0133122
Shop #: WSC 02313 785 00200
VCID: 3668AF7D4111EB91857-8063

Subsystem 1 - Part No: 4E2 910 113 B
Component: Wischer WWS D3 H50 0420
Coding: 00000037
Shop #: WSC 02313

Subsystem 2 - Part No: 4E0 910 557 Labels: 8K0-955-559.CLB
Component: REGENLICHTSENSORH11 0050
Coding: 00139548
Shop #: WSC 02313 ]

http://www.audi.co.uk/glossary/l/lig...in-sensor.html