Multifuntion Steering Wheel upgrade

RexNICO said:

MKV & MKVI steering wheels and airbags have been used in MKIV’s.

If you currently don’t have a MFSW the task will be tougher to use the newer wheels functions, not to mention adding functions (phone) that never existed in the US MIV.

You’ll probably find some info over on VWVortex.

MKVI may be easier, as single stage bags are easier to find.

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Nero Morg said:

I did a MFSW swap for the MKIV steering wheel here recently, only thing I'd suggest is don't use scotch locks for your CAN wiring. Or anything, to say the least. They'll fail down the road and you'll get communication faults.

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JettaTDIBlack said:

I wonder if there is a wiring diagram, that way if I pull a steering wheel, I can also get all of the wiring. I am willing to put in the work to make it like a factory install.

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DaveLinger said:

Here's a multi-page wiring diagram I put together from the Bentley. Highlighted in red is the multifunction steering wheel control (E221). Highlighted in green is the five-pin connector (T5j/b).

Obviously T5j/1 and T5j/2 are for the airbag, and T5j/4 is ground.

Considering there are only two remaining pins, one of them must be dimmed 12v. The remaining wires are green/white and black/blue.

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Nero Morg said:

I can see if I have a diagram lying around. The way I understand how the MKIV controls work, is the buttons on the wheel are just switches to the controller. The "controller" is the 451/452 relay. I know when checking functionality in VCDS after my install there was a few blank fields for phone controls, so I'd imagine it's doable.


Edit:

Here's ther MKIV harness side at least

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