Enabling Trailer Light

[davec]

Has anybody enabled their trailer light with Vag.com

 

The buzzer in the back is driving the grandkids mad

[RADIOTWO]

Has anybody enabled their trailer light with Vag.com

 

The buzzer in the back is driving the grandkids mad

 

Hi davec

 

I think there is a bit more to this !

 

You need to tell us, have you just had the towbar fitted ?

you say it is driving the grandkids mad, but is it buzzing all the time, or only when a trailer is on?

 

 

Radiotwo

[Mirez]

Doddle, open the "Central Electrics" controller and get the current coding, it'll probably be coded as 04096 and you need to add 8 to it so basically it becomes 04104,

 

04096 is the coding for central locking with alarm and remote control - however you should be able to add 8 to any code thats in there to enable the light.

[JRWR]

Presumably it's necessary to be a bit more careful as it may already be turned on in which case simply adding 8 will turn it off and mess up other settings.

 

I think Mirez is saying it's necessary to turn on bit 3 of the coding. So reading the current code 4096 gives, in binary, 1000000000000 (only bit 12 set) and so the new code should be 1000000001000 which, back in decimal, is 4104.

 

Checking my car, I had the code 4113 (in binary 1000000010001) so could safely add 8 so that in binary I now have 1000000011001 (4121 decimal). If I'd already the coding of 4121 then adding 8 would have given 4129 in decimal or 1000000100001 which would have cleared bits 3 and 4 and set bit 5 - almost certainly not what I'd have wanted!

 

Incidentally, does anyone have a full list of what each of these option bits does?

[davec]

Sorry didnt make it very clear Radio2,the buzzer works exactly as it should towbar on for 5years but youngest grandson has started going with us in van and the buzzer is positioned in the nearsdide rear access panel so whenever it comes on its causing him to hold his ears and cry.Dont want to muffle it much for safety reasons so was going to move it to under glovebox but if I can activate the dash light and disconnect the buzzer that would be better.

 

Dont like posting half a novel but perhaps I should have this time (looks for embarrased smiley)

 

And many thanks for other two replies as well

Edited February 21, 2010 by davec

[Mirez]

Presumably it's necessary to be a bit more careful as it may already be turned on in which case simply adding 8 will turn it off and mess up other settings.

 

I think Mirez is saying it's necessary to turn on bit 3 of the coding. So reading the current code 4096 gives, in binary, 1000000000000 (only bit 12 set) and so the new code should be 1000000001000 which, back in decimal, is 4104.

 

Incidentally, does anyone have a full list of what each of these option bits does?

 

You are of couse correct, I assumed it wasn't enabled which was a little silly!

 

Bit 4 of the coding though, not bit 3 as that'll just turn your central locking off :huh:

[JRWR]

Bit 4 of the coding though, not bit 3 ...

I called it bit 3 as conventionally the least significant bit is referred to as bit 0. I presume this is so it's possible to work out the value of any bit by simply calculating 2 ^ bit number. So bit 3 has the equivalent value of 2 ^ 3 = 8.

 

Is it one of these bits that turns on the 'miles remaining' option on the computer that Mirez has? Is there a full list of them somewhere?

[davec]

Is it one of these bits that turns on the 'miles remaining' option on the computer that Mirez has? Is there a full list of them somewhere?

 

Really miss that from my old 97 ghia TDi is there a manual anywhere online for using Vag.com,if not looks like an opening for someone knowledgable.

[Mirez]

Is it one of these bits that turns on the 'miles remaining' option on the computer that Mirez has? Is there a full list of them somewhere?

 

Nope nothing to do with the soft "coding" of the dash unfortunately ;)

There isn't a list that I know of, each VW is entirely different as well so you can't use the coding options of say a passat - I've worked out a fair few so far though ;)

[Richard gal]

So how does it know a trailer light is working if a bypass system is fitted? (as it should be)

[JRWR]

Nope nothing to do with the soft "coding" of the dash unfortunately

That's disappointing. How is it done then? And what's 2 stage unlocking??? :(

 

I've worked out a fair few so far though

Are you going to share? ;)

[Mirez]

Its done by reading the EEPROM, editing a hex bit and then writing it back to the cluster - its actually reasonably simple to do but you do need another cable as the vagcom one can't do it :(

 

Two stage unlocking is much easier and can be done with VagCom, if you frequently drive alone then its a good idea to do - when you press the unlock button on the remote only the drivers door unlocks and the rest remain locked (but deadlocking is unlocked so the doors can be opened from inside) - if you press the unlock button a second time then the remaining 3 (and tailgate) unlock. Its also called Anti-Hijack by some (incorrectly as thats another function), but the idea being that nobody can wait out of sight for you to unlock and then jump in one of the passenger doors - apparently quite common in some countries.

 

I'll share when the list is done, there isn't much worth fiddling with though - its all largely to do with options fitted to the car which you'll either have or not anyway - bit 0 is the toggle for 2 stange unlocking though, in central electronics you'll find the current coding will end in a 1 and needs to be changed to 0 to complete.

 

We should probably start another thread if you want to know more, back on topic - it would only have been enabled with the factory fit towbar wiring which isn't a bypass type but direct, I doubt very much it will work if you have a bypass wiring kit as it's looking at the current draw (via the lamp fail module) and since they dont draw current from the lighting circuits it won't see the extra load.

Edited February 22, 2010 by Mirez

[davec]

I havent got the factory fitted towbar so it looks likely I'll have to add my own light then double drat

[Mirez]

I havent got the factory fitted towbar so it looks likely I'll have to add my own light then double drat

 

You need to see what type of kit's been fitted, most of the galaxy one's I've seen are direct and not bypass ones so it would work fine