The one that says "Heater Push" on it, turns the hot water supply to the heater on when you push it.
The slide switch under the dash controls whether or not the speedometer backlight comes on when the sidelights are switched on.
The foot switch toggles between main beam and dip beam headlights when you press it.
The other two are non-standard. Presumably hazard lights or a reversing light or something like that.
Edit: Doh, beaten to the punch.
