Coming home feature on non-light sensor models

[dracolnyte]

Hi there,

I was just thinking if it was possible to use VAGCOM to try and program the coming home function, on models without the light sensor, whenever the light switch is left on low beam?

Thanks

[CurbKiller]

Do you have a VAG cable? If so try it out. I know on my B6 VW Passat I checked off 'coming home/leaving home' and bingo, the MFI now had that option and I was able to set it. The only issue was it only worked with coming home. I needed the auto headlamp switch to make the other half work, even thought I didn't have auto lights.

Can't see this hurting anything by just trying it out.

Good luck.

P

[dracolnyte]

it'll be great if it had both coming and leaving home functions but thanks anyways!

[coolwater]

So what was the final result? Were you able to enable the coming/leaving home feature through Vagcom?

-cW

[dracolnyte]

im meeting up with naemcivic tmr to use his vagcom cable to see if we can enable it.

keep you posted

[dracolnyte]

actually, i woudnt mind if it comes on everytime i press unlock, regardless of the time of the day!

[NPuter]

I may sound like a broken record, but I am pretty sure you have to completely retrofit auto headlights for this to work...

[dracolnyte]

i wonder if it is hard to install rain/light sensor and the auto headlamp switch into my car

[coolwater]

Even if I keep the headlights in the "on" position?
I would only use this feature when I drive at night.
Which is not terribly often.


-cW

[dracolnyte]

okay so today i had a photoshoot with a bunch of my friends and 2 VW GTI came. both dont have light sensors but one of them was able to vagcom leaving home function.
so i did some research and found out 2 ways of doing this on the VWs:

Method 1:
09 Cent. Elect. -> adaptation 10 ->
Channel 001: Coming-Home Time

Time which the Coming-Home function will be active.

* Range: 10...60 Seconds
* Resolution: 10 Seconds
* Note: Only active if Byte 00 Bit 7 of Long Coding active.

Channel 002: Leaving-Home Time

Time which the Leaving-Home function will be active.

* Range: 10...60 Seconds
* Resolution: 10 Seconds
* Note: Only active if Byte 00 Bit 5 of Long Coding active.

Method 2:
09 Cent. Elect. -> coding 07 -> long code helper ->
To enable both Leaving Home and Coming Home turn on bits 5 & 7

the CH/LH function should come up on the MMI screen or DIS screen.

could somebody please verify if these methods work.

Thanks

[NPuter]

^^
So those instructions are for VW...?

[dracolnyte]

yes, those are the instructions for VW...

[Cabal_san]

So let me get this straight, you want to use the same coding from a GTI on your A4? But you want someone else to be the guinea pig and try it out on their Audi ECU?

Why dont you just try it out and let us know your results. No guts no glory...

[dracolnyte]

okay i just tried it on central elect. 09 today and we have nothing in our byte 0, the bits are 00100111 though so i thought i manually change bit 7 to 1 into 10100111 and it gave me some controller error.... k back to researching

[haroulli]

I Enabled the CH/LH option on my VAG-COM for me P- it gave me the menu option on my screen under "CAR" - "Exterior Lighting" but doesn't seem to functioning. Even though it's a timer essentially.

[dracolnyte]

I Enabled the CH/LH option on my VAG-COM for me P- it gave me the menu option on my screen under "CAR" - "Exterior Lighting" but doesn't seem to functioning. Even though it's a timer essentially.

oh could you share what you did in vagcom so we can both look into it? its a step closer at least. thanks!

[haroulli]

Here you go:

[NPuter]

Here you go:

Have you tested it??? Does it work..?

It just can't be this easy

[dracolnyte]

this is in central elect. 09 right?

[haroulli]

@Nputer: err testing it as in locking the car resulted in nothing, unlocking it also resulted in no change in the headlights. However I have not tested with the lights left in the on position.

@DrAcolnyte: yep it's in 09 and long coding then long coding helper. I'm using VAG-COM 912.

[dracolnyte]

headlights are suppose to be in the ON position to work

[haroulli]

Tried it this AM and drove with the lights on then locked the car, no difference. It doesn't seem to work.

[NPuter]

Tried it this AM and drove with the lights on then locked the car, no difference. It doesn't seem to work.

I believe this is because of our lack of a light sensor... CH/LH is only activated when it is dark out - since we do not have a light sensor our cars have no way of telling between the two...

The only thing we can do now is install a light sensor, or hope a code is discovered to activate CH/LH regardless of ambient light... (ALOT of people want this)

[dracolnyte]

the VW folks can activate CH/LH regardless of or in the absence of a light sensor. The car knows it's dark when you put the headlight switch to lowbeam, thats when it should be active

[haroulli]

Just to update I've tried with lights in all positions with no success. I also tried and enabled the auto rain/light sensor but that threw a malfunction error and disabled the lights.

I guess this further proves the need for this module to be installed. I would like to see if that is do-able.

[christianFSI]

The first Golf 5 models in Europe had to be connected to ground at a given PIN and then the CH / LH function worked...maybe it has to be done at the 8K on the same way...

[Il Signor Zetec]

Hello, I mounted the light/rain sensor on my B8, with a new light switch and without change the windscreen!
I putted the sensor near the central mirror support, in the center of a plastic base glued with a biadesive on the windscreen.
All work ok, only with a lot of sun under the gel sensor you can see little air bubble, I can pass you the VAG mods to do in the weekend, when I return at home.
When I tried to put it, nobody help me for the new VAG setting, so I studied a lot, but there was the result! :)

[dracolnyte]

Hello, I mounted the light/rain sensor on my B8, with a new light switch and without change the windscreen!
I putted the sensor near the central mirror support, in the center of a plastic base glued with a biadesive on the windscreen.
All work ok, only with a lot of sun under the gel sensor you can see little air bubble, I can pass you the VAG mods to do in the weekend, when I return at home.
When I tried to put it, nobody help me for the new VAG setting, so I studied a lot, but there was the result! :)

Hi there,

Thanks for your input. could you write up a DIY and put up some pictures of how you did it and the process? was it hard? and what part numbers did u use?

[NPuter]

Hi there,

Thanks for your input. could you write up a DIY and put up some pictures of how you did it and the process? was it hard? and what part numbers did u use?

+1 - I would love to know the specifics of you retrofit

[Il Signor Zetec]

+1 - I would love to know the specifics of you retrofit

Ok, first you must check the can gateway ecu part number...it must be compatible with the rain/light sensor. My finish with "M" and it's compatible.
Then you need:
-rain/light sensor code 8K0 955 559
-gel for rain sensor code 4E0 955 609
-plug for rain light sensor code 1C0 973 119 B
-2 cable for plug code 000 979 009 E
-some cable 0,35-0,5mm2 to make tree lines from the mirror to the board module under the steering wheel
-new light switch code 8K0 941 531 AA


change the light switch, make a little base to put the sensor on a windscreen area touched from the wiper blades like this (photo of the work on my S3):

http://img.photobucket.com/albums/v2...c/DSCN1164.jpg

[dracolnyte]

seems kinda complicated and costly. im gonna stick back with the vag. thx anyways

[Il Signor Zetec]

seems kinda complicated and costly. im gonna stick back with the vag. thx anyways

I bought quite all from ebay, only some little parts from audi: the total was around 60-70 euros...

[dracolnyte]

gonna continue to try and discover the coding for this mod since I have my own cable now thx to naemcivic +1 ;)

[dracolnyte]

I Enabled the CH/LH option on my VAG-COM for me P- it gave me the menu option on my screen under "CAR" - "Exterior Lighting" but doesn't seem to functioning. Even though it's a timer essentially.

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

[dracolnyte]

short update: tonight i tried putting these bits in 09 cent. elect. byte 6:
byte 6: 00011111 - nothing
byte 6: 11101110 - nothing
though i did forget to open the door when i tried these code. but at least i found out that the leaving home function doesnt work.

Also in adaptation 10, i tried putting channel 46 to 0, no luck

[dracolnyte]

So what I discovered today was the models with the light and rain sensor, even if you leave your headlights on the "ON" position, you won't get CH/LH function to activate; has to be on auto switch...
what this mean is its not even pre-coded in the premium+ models... if you haven't known already....
sigh back to searching

[xxq00958]

So what I discovered today was the models with the light and rain sensor, even if you leave your headlights on the "ON" position, you won't get CH/LH function to activate; has to be on auto switch...
what this mean is its not even pre-coded in the premium+ models... if you haven't known already....
sigh back to searching

not sure whats going to happen if you install only the light switch (with auto) but without the rain/light sensor?....

[dracolnyte]

not sure whats going to happen if you install only the light switch (with auto) but without the rain/light sensor?....

nothing will happen since theres no feedback from the light sensor. it might think that its always daytime or its always night time...

[xxq00958]

nothing will happen since theres no feedback from the light sensor. it might think that its always daytime or its always night time...

yea, thats what i thought too.... can someone who has light sensor and auto on off headlight switch off the light sensor via VAGCOM and see if LC/CH still works??
this will be extremely helpful.....

[xxq00958]

nothing will happen since theres no feedback from the light sensor. it might think that its always daytime or its always night time...

yea....thats what i thought too.... so if anyone with light sensor and auto on off headlight can switch off the light sensor via VAGCOM, and see if LH/CH still works... would be extremely helpful.... I have a base model so I don have LH/CH as well...
hope someone can help!