Installation of a Mk7 Multi-Function steering wheel + paddles into a Mk6

[tigger73]

Halpo definitely has a Mk7 wheel with the cruise control on the steering wheel (this is the only bit that didn't work for him). I've asked if he can confirm the wiring/part number/supplier for his wheel/harness.

Have you actually fitted your Mk7 wheel? My next step is to try tracing the wires to check what wire is connected where in the mk6 vs mk7 harness. At the end of the day the only thing that connects to the car is the big yellow clip and the pinout of this must match up to get things working. If VW has changed things back from there (which I find strange but is possible) then it should just plug together and work.

As I said in my previous post I have a damaged clip on my wiring harness and can't be 100% certain that I won't have to replace the harness. Also there is a "spare" brown wire/spade terminal that I couldn't find a home for so I've taped this up. I'm sure this is not how it was designed, however I've searched all over and can't for the life of me find where this is supposed to go. The only thing I can think of is that in some other Mk7 models that there's an additional connection for the horn which is the case in the mk6.

[YellowLemon]

One is CAN and one is LIN...

They are both LIN protocol (single wire bus) the difference is: on PQ35 it's the SWCM that intercepts the LIN commands and translates them and puts them on the CANbus, whereas is MQB it's BCM that intercepts the LIN signal and puts them on the CANbus.

But I can't see why VW would change the LIN bus commands between the wheels so in theory it should work

You won't know for sure unless you stick a LINbus / CANbus sniffer on the busses to see what signals are being sent around. It's a shame we don't have any pro shops around in Australia like VAGnostics in the UK who are interested in this stuff

[hogster]

I wanted to get the mk7 gti steering wheel for my mk5 gti but decided against because of all these issues.

If the wheel came without the msfw buttons and only dsg would it work in a mk5 golf?

[tigger73]

OK I've done a bit of tracing for the Mk6 and Mk7 wiring harness.

Here's the connections on the Mk6 wiring harness:



And for the Mk7 harness the major difference is the connection of the horn and the use of an additional pin on the Yellow connector:



Also the other thing which I really have no idea about is the operation of the control module that the black connector attaches to (which talks to the buttons/paddles). This sits in the bottom of the mk6 wheel but is "hidden" behind the cruise control buttons in the mk7.

Clearly in Mk6 the horn is routed through this module, however on Mk7 it's connected direct to the yellow connector.

The weird thing is that the horn still works without having to rewire anything so I'm still scratching my head.

Unfortunately I don't have any tools to determine what the function of each pin is and to listen in on any comms.

[YellowLemon]

Ah of course it's not working, the wiring is all wrong. Those diagrams are helpful. If you are game, then rewire the Mk7 harness yellow connector, moving pin 11 -> pin 8. And moving the old PIN 8 wire (horn) onto the black connector PIN 4. So it looks like the Mk6 harness basically. Or just use the mk6 harness?? Then it should work. No guarantees it doesn't blow up.

The weird thing is that the horn still works without having to rewire anything so I'm still scratching my head.

Basically on mk6 cars without the MFL buttons (like my T5.2 as delivered), the horn is routed into the yellow connector directly because there isn't a little black box in the wheel at all. Whereas with the MFSW wheel, the black box in the wheel handles the horn and sends a LINbus command to the BCM to drive the horn. So in a mk6 car like your Tig, pin 8 has a dual function - either horn (when sent to gnd) or data (when connected to a black MFSW box). This is why it (paradoxically) works in your car without rewiring. It seems in MQB they just added an extra pin 11 for the data. But your PQ35 car would like to see this data on pin 8!!

Also:

This guy Peter scoped out the LINbus commands on the mk7 wheel like this (see photo)



LINK: Golf 7 Lenkrad, ich hab's ... | TX-Board - das T5 / T6 Forum

And he built an adapter so it can be used in a mk5 car (LIN v 1.6)
including the cruise control buttons!

But it's pricey:
CAN BUS TP1.6 Lenkrad Adapter Golf 7 Lenkrad - Online Shop OEM-plus-tuning

I've asked him about the differences in LIN between mk7/mk6 I'll let you know if I hear back.

As an aside: are you sure the mk7 harness you have is the correct one for your wheel? Then why is there a loose/spare horn connector? What is the history of the mk7 wheel, did the original seller get it off eBay? Or from mexico? Maybe ask them?

[tigger73]

Yes no problem.

The only thing I wasn't sure of was if the Mk7 steering wheel control module (under the buttons) would have the same function on pin 4 that it would take the horn signal and route it back as comms.

I'll give this a shot tomorrow and report back.

You can't use a mk6 harness on a mk7 wheel as the connector for the airbag is different.

[marcrae19]

Yellow - the link to the module is the same guys im talking to as well. But they tell me that the DSG paddles cant work. I think the romanian guy used a MK7 harness but rewired it back to the MK6 set up so that when it connected it could communicate. Not sure where that left the DSG paddles but i can only assume that they can work given they are working already for tigger.

I feel like we... i mean you... are so close to solving this.

[YellowLemon]

No unfortunately the mk7 black box doesn't have the horn function AFAIK so when you rewire you should in theory have:
1) all MFW buttons working except the GRA/CC
2) no horn
Like this dude here:
Einbau Golf7 MFL einbau | TX-Board - das T5 / T6 Forum

The mk6 MFSW wheel blackbox pinout AFAIK is:
Pin 1 - Ground
Pin 2 - +12V
Pin 3 - LIN BUS
Pin 4 - Horn input
Pin 5 - nothing (??)

What is really curious is that your flappy paddles are working! It must be going over that pin 11 on the yellow connector? Wish I had access to ETKA to see WTF that pin is

marcrae19 did you contact Peter or Martin from that link? I sent a PM to peter, will let you know what he says. Yeah it would be cool if tigger got this to work!

[YellowLemon]

Just got a PM from Germany confirming what you say marc: everything should work including cruise control, but not the DSG paddles.This is so weird.

[tigger73]

Now to pull the connectors apart and rerun the wires.

I'll take a few photos so if it works I can post up a DIY.

No idea why I have an extra earth connection. Perhaps on the base model mk7 wheel there's 2 connection points. It does seem strange and unfortunately I don't have the background on this steering wheel/harness.


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