It's a needlessly over-complicated bloody stupid setup, straight out of the Volvo Department of Silly Ideas. The switch provides momentary action, transistors handle the logic of whether that means turn on or off (a flip-flop, basically), the relay handles the current. All this simply so the switch is momentary rather than a dual-position. Oh, that and rule-setting about whether the car will 'allow' you to switch them on at all! Us mere drivers can't be trusted to manage our own light switches.
Don't even get me started on the main-beam doubling up as beam-flash - that must've been the Chief In Charge of Silly Ideas' own work, he put in overtime that day I reckon.
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