Low beams are not working, high beams do.

Have you checked for a burned connector at the CEM?

It is likely the head light switch that is defective.

That should be the problem.
Check the voltage at the dimmer on each setting.

The switch is bad more than likely

Headlamp relays are most always in the engine compartment in one of several power distribution boxes. It could be the dimmer switch, DRL module, or both bulbs. This happens because the lights are so bright, one low beam has burned out, and goes unnoticed until the other one burns out also.
Daytime Running Lamps (DRL) use the low beam but at a reduced power, which shortens their working life. Hope this helps.

Are the bulbs good?

If your low and high beams are on the same bulb, then the low beam elements have blown even though the high beam still works, you need two new bulbs.

i think im right in saying the low beam bulbs are twin filament(low and high beam in one)and the main/high beam are single filament(spotlights).

Check fuse box; check if the bulbs have double filament (high / low) and finally, check multi-switch.

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ring bury volvo dealers and give them the registration and they will give you the code. I also had the same problem

faulty light switch or light control module