As Shackeng said, the selector lever has to be in drive before you can select snow/winter mode. The button should light up and there should also be a light on the display panel.
If none of the above. pull off the gaiter around the selector lever and push out the snow/winter mode
panel and check the wiring connector is seated properly.
Thanks for the tip, just did it earlier today actually. There's no light in the winter mode light (or sport) at all. Tried to disconnect and reconnect the wiring connector to the winter button under the gaiter but still no joy unfortunately.
Today, I've also checked the following:
- Blue multiplug connector
- All fuses
There's a 30 amp fuse in the engine fuse box that keeps breaking every week or so, but it has been so for as long as I have had the car, so I don't think this has something to do with the gearbox problem. Unfortunately I don't have a wiring diagram so I'm a bit confuses as to where to look (and also what this 30 amp fuses is for).
Still keep thinking about the fault code I got when my diagnostic tool managed to connect to the gearbox that one time; "Power relay voltage low"...