Interested to see how you get on with this question...the service manual provides some confusing advice.
eg. Turn switch to sidelight position and pull out to first detent position..turns on rear foglight.
Turn switch to full (dipped) headlight position and pull out to second detent position and both front and rear come on.
My rear one works as it should, but I can't get my front ones to work. No real problem for me as I have a set of LED angel eye types, fitted in the lower side grill sections and they are automatically turned on when the motor is running.
They double as DRLs and fog lights...over here, all vehicles moving on the road MUST have front, white lights, showing at all times, regardless of the time of the day. My lights are set up so whenever the motor is running, headlights (dipped) and the LEDs are showing. When I stop and park, switch the motor off, the headlights go out straight away...the LEDS stay on for about 2 mins.