Bringing mine in for service on tuesday and have prepared a whinge list. Not too long this time but there's no guarantee they'll fix anything.

My steering wheel buttons for everything are acting up. Red phone hang-up button doesn't function at all these days. The mode button sometimes changes radio stations, advances the CD tracks or even changes the volume. The volume buttons advances the CD and the CD advance generally only now changes the volume. The cruise control comes on when switched on but if I dare touch the increase or decrease speed buttons it switches off and won't reset until I stop, withdraw they key and restart. This is my second time around complaining about the Cruise Control.

I think the phone wiring is the guilty party - It's an LR kit retro fitted last summer so still under warranty. Anyone else had wheel wiring problems before I have to suffer the "dunno mate, never reported before " standard answer from the service? RRS TDV6 (gone)
RRS TDV8 HSE(gone, burned out)
ML 320 CDI Airmatic

I don't remember those sorts of issues being mentioned here before, Kevin... but I'm sure you're on the right lines. Certainly sounds like wiring trouble...  

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A dealer rewire is needed from the sounds of it.

Or

Sell it 
" WITH MORE EXTRAS THAN A HOLLYWOOD EPIC "

"...and the good thing about this car, is that you can operate loads of stuff from the steering wheel!"  

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That's seriously fu**ed!!!

They should try a replacement steering wheel as I'm sure TB will correct if I'm wrong, but I would imagine the electrical connections are hard wired to some extent.

A simple process of elimination, start at the switching end (steering wheel) and work back from there... L319 D4 HSE

1998 110 TUM HS FFR Hard Top XD WOLF

1982 Series 3 SWB

back from the service - fixed everything under warranty and claimed it was a simple matter of "poor contact" with the buttons. When pressed for a more detailed answer he said they had stripped wheel, removed cover and rechecked wiring (phone as well as cruise control and radio stuff) , tested it and confirmed it was fine.

It's working now - so let's see RRS TDV6 (gone)
RRS TDV8 HSE(gone, burned out)
ML 320 CDI Airmatic