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CT, fog lights are supposed to turn with headlight switch on and fog light switch on(at least in my 740).
If the headlight switch is working OK, I would suspect the switch first.
Also you might want to resolder the relay any way. Volvos relays are famous for poor soldering in them leading to failure.
As you read the different posts you might read to "fosterize" the relay. This is a slang for resoldering the relay ala Don Foster, one of the board regulars. Basically take off the plastic case covering the relay and look for broken solde and/or brown spots. You resolder these spots and VOILA! the relay works like new.
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