You will have to remove the whole facia that houses the switches and heater controls, and access the switches from behind as i don't think the wire is long enough to pull through. To do this:-
Remove the ashtray and undo the 2 screws, undo the two screws on the top which face downwards towards the cd player/radio, then carefully pull of
the facia panel by pressing down on the top (above the switches) and pulling forwards. Then all the wiring can be seen and switches pulled out if needed.