OEM towbar electrics activation

[LeFrog]

:1zhelp:

I have a 57 plate B6 Passat Estate that I have fitted with a full OEM tow bar and electric kit which now needs activation. There are about 5 codes to change all detailed on an A4 sheet of paper and my VW dealer has just quoted me £242-00 PLUS VAT for the privilege.

Any ideas please

[Theresias]

We (Ross-Tech) do have several retrofitting instructions on our website already, but so far the VW Passat (3C) isn't one of them.

http://wiki.ross-tech.com/index.php/Retrofitting

If you'd like we could assist you with this since I have the necessary instructions already here, but to be of any help we'd first need a full diagnostic protocol (i.e. VAG-COM Auto-Scan) from the car.

[gskm10]

Hi , sorry to bother you. I have a 2006 Passat B6 2.0 TDI and have just fitted the full VW wiring kit for the towbar from Westfailia. Do you know how to change the settings using vag com for this model to enable the aditional towing functions. ?
Thanks in anticipation....
Joe.

[martin1810]

http://issuu.com/publishgold/docs/e321535391105-05 Have you not got these instructions with your towbar. According to this there are no additional functions on vehicles pre MY07.

[kenney]

central electronics 09, long coding 07 Byte 04 Bit 2 (tow bar fitted)

[gskm10]

On this web page :- http://openpdf.com/ebook/passat-towbar-wiring-pdf.html under the heading

"Fitting instructions Electrical installation kit" there is VW instructions to set up the electronics side of the towbar instalation on the 2005 / 2006 B6.

I have fitted the full OEM Westfailia towbar kit and it turned in to a mamouth task taking over 12hours ! I previously fitted and wired up a towbar on my B5.5 in 90 minutes using using an OEM kit.

I now need to get the software tweeks done at a local VW specialist. The VW instructions say that under brake electronics 03 the code is changed by adding 16384 to the old code but on the vag com wiki site it says to subtract 16384 does any one know what is the corect method as I do not want to book the car in and get the settings changed to a wrong specification and then get charged again.... Cheers.

[Nick Crush]

I am having trouble with my 2005 B5.5 trying to tell it that it is towbar equipped in respect of the park assist. I have successfully coded everything else cruise control, auto door locks, beep on locking etc but it will not remember the short code 00114 to 10114 I think from memory. It also cannot tell when a trailer plug is connected - this is all in module 76 . I therefore imagine that a wire might not be connected on the genuine VW dealer fit bar any ideas please?

[kenney]

The code 00114 is the correct code for the 3B manuel variant passat 76 control unit ,and nothing to do with deactivating the parking aid there is a micro switch in the trailer socket,which deactivates the rear fog light and the parking aid function,when the trailer socket is inserted.

[Nick Crush]

Thanks but isn't a microswitch a bit advanced for 12n & 12s sockets. Granted a 13 pin set up would have?
Also why does VCDS give the option to recode the park sensor unit to tell it it has a tow 'hitch' ?

[kenney]

Also why does VCDS give the option to recode the park sensor unit to tell it it has a tow 'hitch' ?
So that the deactivating can function when you insert the socket,and it also informs the braking system,when the trailer is connected
Do you have a 3B or 3C model

[Nick Crush]

Also why does VCDS give the option to recode the park sensor unit to tell it it has a tow 'hitch' ?
So that the deactivating can function when you insert the socket,and it also informs the braking system,when the trailer is connected
Do you have a 3B or 3C model

It is a 3B but the point is I cannot change the coding - as I understand it there are two ways a car can tell it has a trailer - a microswitch ala 13 pin or electrically which would need so coding as above which I cannot do as per my original post. There does not seem to be any other modules that need to be coded first as far as I can tell like on say a 3C.

Maybe I should have put I am trying to find a way to turn off the parking sensors when a trailer or cycle carrier is used

[kenney]

As stated earlier the deactivating function is a micro switch in the socket,if you do not have that, then you have the wrong socket,OR you can simply fit a switch on the power line to the parking aid control unit

[Nick Crush]

As stated earlier the deactivating function is a micro switch in the socket,if you do not have that, then you have the wrong socket,OR you can simply fit a switch on the power line to the parking aid control unit

Thanks for trying but this does not have a microswitch.

I would be interested in people's thoughts as to why the coding cannot be changed? As I stated this was a dealer fit set up from new.

[martin1810]

Thanks for trying but this does not have a microswitch.

I would be interested in people's thoughts as to why the coding cannot be changed? As I stated this was a dealer fit set up from new.

As kenny has tried to explain. The factory fit vw socket was a 13 pin socket with a micro switch. The micro switch deactivates the rear fog light and informs the reverse sensor module that you are towing so the sensors switch off. This car is not can-bus and cannot have the reverse sensor module recoded. This only became possible with the B6 passat which uses can-bus.

[Nick Crush]

As kenny has tried to explain. The factory fit vw socket was a 13 pin socket with a micro switch. The micro switch deactivates the rear fog light and informs the reverse sensor module that you are towing so the sensors switch off. This car is not can-bus and cannot have the reverse sensor module recoded. This only became possible with the B6 passat which uses can-bus.
Thank you but as I keep stating this is a dealer fit with 12N socket (7 pins) with no microswitch. The factory fit part agreed would be 13pin but this is not a factory fit. I can accept your point about the car being can bused except that there is a code in the pdc unit for no towbar 00114 (where position 1 is 0 for no towbar and 1 for towbar)

[kenney]

I think you are looking at the wrong code as position one in the code is not in use and is always 0,The standard seven pin contact is not suitable for vehicles with parking aid,

[Nick Crush]

Here is a PDF showing screen shots that indicate this is all for a 3B passat and not the later one. I have enclosed a second shot of the control unit coding without the help screen.

[kenney]

One of the information sources is wrong,and the fact you can not change the first digit suggests vcds is wrong.the info source i have says the first digit is not in use and is 0 otherwise the code is the same

[martin1810]

The point I was trying to make is that without can-bus, the 3b series has no ability to sense changes in the electrical system and report them back. So it wouldn't matter what any coding says because the system would never know when a trailer etc was connected or not connected.