Can't find this information anywhere else so asking via a new thread.

Fiat Ducato 2.8d year 2000 Swift motorhome: Rear fog lamp does not work.

Bulb and connections good in the cluster but no power getting there.
Button on dashboard does not illuminate or hold-in, so think this is the place to start investigating the fault.

Please can anyone tell us how to remove the switch which is on a little panel on the right hand side of steering wheel. There are 3 other 'blanks' on the square panel.

Many thanks

Update....we have managed to remove the switch, and OH got the fog lamp to work (not sure how!) and you could hear the relay cutting in and out while pressing the switch, but then if you turn the headlights and ignition off and back on again the fog lamp no longer works next time you operate the switch.

Does anyone have any ideas please, and is there a wiring diagram anywhere for the fog lamp circuit??
(Did find a thread containing a wiring diagram for a 2.3 jtd 06 fog lamps but sadly OH says it's nothing like ours)