I had a problem with my trip computer on my recently bought Coupe. It wouldn't work with the button on the end of the stalk but sometimes did when I worked the windscreen washers.
Raking through this forum I found a post by someone who had investigated similar happenings and found two wires solder had broken from the wiper stalk.
This was also my problem. The other chap managed to re solder them. I, for now, have connected a small push button switch (reset switch robbed from an old computer
) until there is more light, better weather etc, so I can attempt soldering mine.
Be nice to be able to remove the steering wheel to get in better, but as it has an airbag, I'm a bit worried about removing it.
You can have a look by removing the bottom steering column cowling (3 torx screws) and by looking at the wires running to the stalk. The two offenders in my case were a light brown colour.
Might be the same problem happening here.