Trailer module coding...?

[pistoncranky]

Hi
Does anyone know if its possible to use an OBD11 (Bluetooth OBD connection and tablet computer) to code the can-bus to detect the VW original trailer module I've installed?

(the module is connected to the towbar connector socket and the pre-wired vehicle trailer connection harness).
I'm wondering if its one of those things that has to be done with a proper VAGCOM cable and a connection to the VW system / database.. other than going to a VW dealer I haven't found anyone who knows much about doing it.


Also, Is there a risk if I connect up the can-bus wires above the footwell and then drive the vehicle before coding it - obviously trailer functions won't be working because the system isn't coded yet but does it cause any issue.
Cheers,
Chris

[Umai Naa!!]

No issues.

You just need to access the CANbus gateway with OBD11, etc... and select that the Trailer module is present.

[pistoncranky]

No issues.

You just need to access the CANbus gateway with OBD11, etc... and select that the Trailer module is present.

Hi, Thanks for that.

I have spliced CAN-bus wires under the dash and the trailer module is present in the module list but shows a fault in the gateway interface (naturally enough) also faults in the trailer module.

The only way I can see to modify the Gateway (19) is via long coding which shows me 3 byte each with 7 (or bits and check boxes next to the bits but only a few are given descriptions (four wheel drive / offload) the rest are Bit 1, Bit 2 etc.

I am thinking that one of those bytes will have a bit assigned to the trailer module and ticking it will activate it but I don't know which one.

Am I one the right track here and which Byte / Bit is it? (doesn't seem to show up in any searches)


I had a short "oh poop" moment after doing the soldering of the CAN wires and reconnected the battery and started the engine - two error lights on the dash stayed on - then I remembered the steering and TCS light always come up after disconnecting the battery and will go off when rolling out the driveway.

I also get a warning in central electrics in the OBD11 that rear left blinker and brake light are open circuit but it doesn't turn the globe blown light on.. I'm assuming that's part of the coding need.

Cheers, Chris

19 Gateway

System description: J533 Gateway
Software number: 7N0907530R
Software version: 1632
Hardware number: 7N0907530H
Hardware version: H42
Serial number: 060912F1002157
Long coding: 356003

Trouble codes:
01044 - Control module incorrectly coded
static

69 Trailer Function

System description: Anhaenger
Software number: 1K0907383F
Software version: 0100
Hardware number: 1K0907383F
Hardware version: H09
Serial number: 00008200695164
Long coding: 0100000100000000

Trouble codes:
01299 - Diagnostic interface for data bus No signal/communication
Intermittent
01336 - Combination Comfort databus No signal/communication
Intermittent
00457 - Vehicle Electrical System Control Module No signal/communication
Intermittent

[Dan_3MPS]

Clear your errors/trouble codes, go for a drive around the block to turn the TCS and steering error off and rescan for codes.

01299, 01336 and 00457 as you've listed above are CAN communication errors, which if you cut wires to splice may have happened then or are an indication your soldering isn't holding a reliable connection on one or both the wire pairs.

01044 will go away once you tell the gateway a trailer module is installed.

Edit - based on my experience with a MK6 Golf install, but I used VCDS so can't help you with the OBD11 tool coding.

[pistoncranky]

01299, 01336 and 00457 as you've listed above are CAN communication errors, which if you cut wires to splice may have happened then or are an indication your soldering isn't holding a reliable connection on one or both the wire pairs.

01044 will go away once you tell the gateway a trailer module is installed.

Edit - based on my experience with a MK6 Golf install, but I used VCDS so can't help you with the OBD11 tool coding.

I cleared the trouble codes and had a drive and rescanned for faults.

The only remaining one was the trailer module not coded.

I am pretty sure my soldering is good. I suspect that it might be a case that the CAN-bus has something of a backup capacitor or can detect shorts or open circuits when the power is lost so during the cutting and splicing there would have been open and short circuits that might have been detected even with the battery disconnected.
Anyway, they have been cleared and didn't come back during the short drive which was the same as the test drive I did after splicing the wires.

Someone will know what Byte the trailer bit is on and which bit.. from my reading it looks like Byte 3 bit 6.

Cheers,
Chris

[Dan_3MPS]

Someone will know what Byte the trailer bit is on and which bit.. from my reading it looks like Byte 3 bit 6.

Byte 6 Bit 3 maybe? Just going from memory there

[pistoncranky]

Byte 6 Bit 3 maybe? Just going from memory there

Thanks but the way I read it there's no Byte 6 in the long code 35 60 03 - I read three bytes there


35Hex = 0100011
60Hex = 0111100
03Hex = 0000011
I can see in the check boxes on Byte 03 there are two ticks in the end bits = 3 (Hex 03) but no description of the assignment to those bits - maybe I can work it out by eliminating what is available and turned on in my car.


I can also read on Ross-Tech about the various gateway modules on Golf and Tiguans and the Byte/bit values that apply with the three various Gateway controllers but I can't say which is diffinitive for my Tig. if my Tig has the Gateway controller Hardware number: 7N0907530H then Bytes 02 bit 6 controls the Trailer (on h/w version F-K) which does not show a Bit ID (or anything) just check boxes. On later h/w version B/b = 03/06. The description says bit 1. bit 2 etc.


So is it bit six on Byte 3 or bit 6 on Byte 2?


Any knowledge on this? (Umai ?)


(Dan - there is some web talk about B6/b3 but its pertaining to the engine module and doesn't refer to activating the trailer control module in the CAN-BUS Gateway.


Cheers, Chris

[pistoncranky]

I can also read on Ross-Tech about the various gateway modules on Golf and Tiguans and the Byte/bit values that apply with the three various Gateway controllers but I can't say which is diffinitive for my Tig. if my Tig has the Gateway controller Hardware number: 7N0907530H then Bytes 02 bit 6 controls the Trailer (on h/w version F-K) which does not show a Bit ID (or anything) just check boxes. On later h/w version B/b = 03/06. The description says bit 1. bit 2 etc.

This about Gateway on Ross-Tech: VW Golf (1K) CAN-Gateway - Ross-Tech Wiki

[Umai Naa!!]

I'm not sure how it's done with OBD-11. I assume VCDS is the checkbox method, which is similar to the factory ODIS/VAS-PC. All you're doing is enabling 69 - Trailer in the CANbus Gateway. No coding in the trailer module itself.

The other thing is check that you've spliced the wires correctly. Green/Orange - Green/Orange, Brown/Orange - Brown/Orange.