Coming home feature on non-light sensor models

[dracolnyte]

I just did the vagcom changes u suggested under 09 cent. elect. byte 6 bit 1,2,3 and it doesnt work, exterior lighting doesnt even show up in CAR. i am using vag 908 though, but it shouldnt be that different

Thanks to the help of Nputer for providing his coding,
Radio 56, Byte 10, bit 0 enables "Exterior Lighting" in CAR menu
if its not already labeled by your VAG (silly me)

I was able to get the settings for
Coming home
Leaving home
and headlamp converter

But CH/LH still a mystery

[NPuter]

Thanks to the help of Nputer for providing his coding,
Radio 56, Byte 10, bit 0 enables "Exterior Lighting" in CAR menu
if its not already labeled by your VAG (silly me)

I was able to get the settings for
Coming home
Leaving home
and headlamp converter

But CH/LH still a mystery

I am glad that you were able to get the menu...

Are your options for CH/LH greyed out?

[xxq00958]

I am glad that you were able to get the menu...

Are your options for CH/LH greyed out?

CH/LH isnt greyed out in my case (I have a base model)
but its not going to work without auto on/off switch, and maybe rain/light sensor.
so it might be helpful for people who have CH/LH function to disable their rain/light sensor via VAGCOM and see if the CH/LH still works...

[dracolnyte]

I am glad that you were able to get the menu...

Are your options for CH/LH greyed out?

Nope, my CH/LH functions were not greyed out, I can go into them, set timer and turn on/off...

[haroulli]

Ok bringing this up again. Has anyone seen this from Kufatec http://kufatec.com/index.php?main_pa...oducts_id=1328 I think retro fitting this mirror with the sensor and the Auto Light switch would be the only way to go to get the LC/CH working.

However I guess these are the main questions we need to answer before jumping in to this:

1. It states its "Only suitable for vehicles equipped with PR-Nr. 8N6" what option is this?
2. Replacing the windscreen, is it necessary?
3. Do we need a different mount? If so is it supplied in the Kit?

Feel free to answer these and/or add more questions I might have over looked!

[haroulli]

Ok I checked the build sticker in the spare wheel well and I don't have 8N6 but I still havent lost hope.

[DavidB8]

Save your energy checking your sticker: 8N6 = Windshield wiper intermittent control with light/rain sensor

My mirror is fully exposed so I can try unplugging it and see if I still have CH/LH. Stay tuned.

[dracolnyte]

Save your energy checking your sticker: 8N6 = Windshield wiper intermittent control with light/rain sensor

My mirror is fully exposed so I can try unplugging it and see if I still have CH/LH. Stay tuned.

First of all, I would like to say thanks for your help!
But on my car, and most people in this thread does not have a rain and light sensor, however we would still like to have CH/LH function.

But if you say you are going to unplug your sensor, are you going to leave the light switch in "auto" or the "on" position?

[DavidB8]

I'm aware of peoples plight on this one. I do know the thread is based on enabling the feature without the sensor. I was just providing you with the PR description so everyone knew they didn't have to check their sticker.

As far as on and auto goes for the switch I think that would be based on testing. If it doesn't work on Auto where it should we'll know it's 100% sensor reliant and the testing can stop. If it does work then the switch goes to on for testing. If it doesn't work while in the on position then you know it's switch dependent. Not to worry, I have a bit of experience doing testing.

[TR464]

There's no way of getting CH/LH without the rain&light sensor. The sensor provides a LIN bus signal that can't be substituted (except by a microcontroller).
But anyway, what's the problem in retrofitting the sensor?
- Swapping the light switch is plug and play.
- Just 3 wires to connect the sensor and you'll have the full functionality.
- Mounting is a breeze if you have the large mirror holder, if not you have to tinker a bit using some VW parts.

[DavidB8]

Interesting that VW's seem to have some different programing options. Besides this one, they have rain/light sensors that are capable of sending a close signal to the windows and sunroof if it rains (if coded of course). Ours wont.

[TR464]

... Besides this one, they have rain/light sensors that are capable of sending a close signal to the windows and sunroof if it rains (if coded of course). Ours wont.

It's not a matter of the sensor signal, it's the ecus capability to work with the sensor information, :-)
Our ecus are not designed to handle the rain close feature.

[TR464]

... Mounting is a breeze if you have the large mirror holder, if not you have to tinker a bit using some VW parts.

Here is shown how a rain&light sensor can be mounted to the rear window (sorry, howto is in German of course, just watch the pictures of the parts):
http://www.passatkomfort.de/Daten/Re...cheibe_1v1.pdf

I adopted this description for the front screen, glueing the mounting bracket 3B0 845 543 A to the windscreen next to the mirror. It's the second best option if you don't want to replace the windscreen with one that has the large mirrer holder.

[DavidB8]

It's not a matter of the sensor signal, it's the ecus capability to work with the sensor information, :-)
Our ecus are not designed to handle the rain close feature.

Well I did a bit of research on that one with the VW's and found that only certain sensors would work with that feature. There where a few threads on VW owners upgrading their sensors to make it work. Not sure I ever seen anything mentioned about module changes though. At any rate I chased that one down as far as I could including trialing some coding but it just wouldn't work with our setup.

[TR464]

... only certain sensors would work with that feature. There where a few threads on VW owners upgrading their sensors to make it work. Not sure I ever seen anything mentioned about module changes though. At any rate I chased that one down as far as I could including trialing some coding but it just wouldn't work with our setup.

Well, you can actually code our light&rain sensor (subsystem within ecu 09, Byte 0, add 4 to current bit value - that makes coding 07 if highway and rain light was already activated) - coding is accepted, so the sensor is capable of performing this function, but it doesn't work since the 09 isn't.

[dracolnyte]

but i find it weird that the VW guys is able to code CH/LH without the sensor by simply putting their light switch on the "ON" mode.
Is there a way that I could manually go in and write my own code?

[haroulli]

There's no way of getting CH/LH without the rain&light sensor. The sensor provides a LIN bus signal that can't be substituted (except by a microcontroller).
But anyway, what's the problem in retrofitting the sensor?
- Swapping the light switch is plug and play.
- Just 3 wires to connect the sensor and you'll have the full functionality.
- Mounting is a breeze if you have the large mirror holder, if not you have to tinker a bit using some VW parts.

I think this touches on part of my previous question. I'm pretty sure like TR464 says we can't just enable it within the ECU, my question remains what goes into retro fitting this. I have found this on ebay http://cgi.ebay.com/ws/eBayISAPI.dll...ht_1082wt_1141 Do I need a new windshield? Since its mount is larger? And does it plug in somewhere in the roof near the Sunroof controls or do we have to do some wiring? And obviously we need to change the switch for the Auto Option.

[TR464]

but i find it weird that the VW guys is able to code CH/LH without the sensor by simply putting their light switch on the "ON" mode.
Is there a way that I could manually go in and write my own code?

Weird or not - VW is not Audi, their sensor and ecu are different to ours and no, you can't.

[TR464]

I think this touches on part of my previous question. I'm pretty sure like TR464 says we can't just enable it within the ECU, my question remains what goes into retro fitting this. I have found this on ebay http://cgi.ebay.com/ws/eBayISAPI.dll...ht_1082wt_1141 Do I need a new windshield? Since its mount is larger? And does it plug in somewhere in the roof near the Sunroof controls or do we have to do some wiring? And obviously we need to change the switch for the Auto Option.

No stock rain&light sensor from factory => small mounting bracket => no, the autodimming mirror won't fit without either swapping the windscreen or creating a custom holder (cut roughly 10mm from your old -small- mirror mounting and screw this into the center of the large mirror intake)
Any chance to swap the mounting bracket? No, you won't get rid of the old one without cracking the windscreen (and the large mounting bracket isn't available seperately)
Wiring necessary? Yes, wrote that before. Ground, +12V and signal, routed from the roof console to dash board right side and ecu 09 - nothing prepared from factory.
Light switch with auto position? Yes, mandatory required, just plug&play
Any chance to integrate the rain&light sensor into the small holder? No, that's why I posted a link to the pdf above

[haroulli]

From DavidB8
Without doing all the research right now you would need:
Rain Sensor: 8K0 955 559
Adhesive kit: 4E0 955 609
Plug: 1C0 973 119 B
Wires: 1K0 973 333 x2
Switch: 8K0 941 531 (AL, AS,??)

[DavidB8]

Incidently I have read about people retrofitting the sensor in back windows and other locations since it is no necessary to install it with the mirror although it's ideal.

[NPuter]

Incidently I have read about people retrofitting the sensor in back windows and other locations since it is no necessary to install it with the mirror although it's ideal.

Wouldn't rear window tint mess with the sensor's reading (that is if you have tint)?

[TR464]

Incidently I have read about people retrofitting the sensor in back windows and other locations since it is no necessary to install it with the mirror although it's ideal.

Not a good idea since the rain-sensor (remember it's a rain&light-sensor) needs to be mounted within the clearing range of the windshield wipers.
The link I posted in Januar was just to show a mounting option for those who don't have the large mirror bracket - simply adopt this way for the windshield.

[DavidB8]

Well you could cut the tint out where the sensor would go. Just saying I have seen other installs. Most people do it for the light sensor not the rain so it's important to keep in mind how it functions. I seen a few VW Folk that installed it in their rear windows but as Thorsten mentioned there is viable solutions.

[dracolnyte]

Went to play with the VAG tonight, tried to make some discoveries but ended up finding some useless things or nothing at all.
In central elect. 09 Byte 0, I have tried the following bits:

10100110 - fail
01100110 - backround lighting remains on with key in ignition
00110110 - nothing
00101110 - nothing
00100111 - nothing

00101111 - nothing
00110111 - nothing
01100111 - nothing
00111110 - nothing
01101110 - background rings longer
00111111 - nothing
01101111 - nothing
01111111 - nothing

I tried opening the door, locking, unlocking with the switch at "0" and "ON" for all combination. Also, what I learned is the CH/LH feature is not switch dependent.

[DavidB8]

When you say the option isn't switch specific does that mean you have tried an Auto switch? I thought you needed to have the switch in the Auto position for this function to work.

[dracolnyte]

When you say the option isn't switch specific does that mean you have tried an Auto switch? I thought you needed to have the switch in the Auto position for this function to work.

yeah i got an auto switch to try and it didnt work

[haroulli]

yeah i got an auto switch to try and it didnt work

Thanks for the update on this, Im still interested in doing this however cost being an issue it has to wait.

[dracolnyte]

im not giving up either lol

[NPuter]

So, you guys want to install the light/rain sensor along with me?
It looks like that is the only option...

[dracolnyte]

David, if we get a rain and light sensor, do we need to program that in VCDS to work properly or is it plug and play? if we do need to vag it, which module/byte/bit is it?

[dracolnyte]

check out this thread http://forums.vwvortex.com/showthrea...1#post70670147

its three wires, power, ground and LIN bus


im thinking if theres anyway i can trick the car into thinking that there is a light sensor installed by shorting the power to the ground with a load resistor. And since there is no signal from the third wire, car might think that it is always night time so all we really need is the auto switch

[DavidB8]

The car uses the lin bus wire to know if the sensor is there, not the power wires.

I'd have to look the coding up but you do have to VCDS it. I'm not at my car so I don't have access to all my modules for coding. At the very least byte 22 bit 0 on module 9.

Ok so to put this one to rest, if someone in the US can get me a sensor from ECS (I'll pay for it) and ship it to me I'll replace my factory sensor with this one and see if it will function. The reason I ask for someone in the US is because shipping from ECS is brutal to Canada and this part should be small enough to get and ship through USPS at a fraction of the cost. FYI they want almost a $100 to ship this part to me.. I didn't realize they where going to buy it a plane ticket.

Here is the link http://www.ecstuning.com/Search/Rain_Sensor/ES485115/ Yes it is only $9.95 for the part. With shipping to me from ECS $100!!!!!!! Please bend over.. No kissing or lubrication allowed....

Any takers?

[dracolnyte]

darnit!!! today my chinese vag908 decided to die on me EFFF!!!

on the side note, David, that is the rain sensor, your theory is to try and fool the car with that as if it was a lightsensor because it too uses a LIN bus?

[DavidB8]

It's a dual sensor. What may be possible for those that don't want or need the rain, simply mount the sensor under the dash. Always dark so the CH/LH will always be active. Of course trial is contingent on actually getting my hands one of these sensors.

[dracolnyte]

ya i get you. Maybe ask haroulli or nputer to ship it
oh wait, I can ask my roommate tmr, she has an address in florida

[DavidB8]

I figure about 15 minutes with that unit and I can tell you if you guys have a way to get the feature working.

[dracolnyte]

any way I could test it out by borrowing my friends car with an actual light sensor?

[dracolnyte]

alrighty, I got my roommates florida address, gonna order it now. If you get a chance to actually have it shipped to NT, we can test it out simultaneously.

[DavidB8]

Yeah if you don't mind doing some disassembly and rewiring on your friends car.

I'll post my request in the main forum as someone that is willing to help may not be reading this thread.