I would think that the CANbus attached to it would be the Powertrain CANbus...this means it is not accessible on the OBDII interface of MKIV's.

The unit is probably programmed via K-line, and the CAN-bus is only used for it to receive drivetrain/engine/wheel slip info. If you want to monitor info, you can tap into the Powertrain CANbus in the cluster connector or the connector that goes from engine bay to cabin.

Not sure on a complete list...I think MED9/EDC16 and on (MED17/EDC17...) ECUs are programmable via CANbus (general statement). I think the ME7 could be configured (dataset) to be programmed with CAN, but if you want to do it over OBD you have to wire up the port (on most MKIV's, there is no CAN wire even run to the OBD port!). After this, you would have to re-code the cluster to distribute the message properly through the CAN gateway (internal to cluster) to the powertrain CANbus.

For the Haldex unit...I guess it will all depend on whether it supports read/write and if it has security access.

the vortex thread got sidetracked by someone trying to get it through Can-Bus.

Apparently the hex code has been read out of the car and flashed successfully. For simplicity sake I think this is the way to go. It takes but a few seconds to pop it off and disconnect it.

I would love to support someone doing this, I don't have the skill but will contribute parts/funds for a bench setup.

do you need anything?

We just need to get a library of code for the 3 versions of controllers used.

I was also looking for an upgrade version ! I accidentally found a guy who manage and make his own controller I used it now for 4 moths and it's much better from the o.e or the blue/orange versions

some info from him :

"Facts from the controller:

It’s a little box, which you should install to the bottom of your trunk.
You have to connect the supply and a signal from the breaking light, if you want from the handbreak to.
You have to modify the haldex valve. Just cut 6 cables inside and connect to my Haldex controller.


You can choose between two different modes:

Street Mode:
4 wheel drive is only activated if you need it cruising and breaking --> no torque at the rear wheels accelerating --> torque at rear wheels, depending on rate of acceleration and curve you are driving nearly the same like original

Race Mode:
4 wheel drive is activated the whole time Lock grade of the haldex is just reduced down to min. 50% if you are breaking, and driving curves. But 4 wheel drive is never off.
This should bring better racing performance, or better performance for tuned cars.
ABS and ESP is limited!!!!!!!!!!  "


 If anyone interest for more info i can provide to them


 

Also interested.
There already is one product for gen1 at 4motioncontroller.com/shop