H'mm
Looking at
https://www.volvopartswebstore.com/s...roduct=1141811
It does imply its under the dash area, but when i picked up a spare rear lamp for my old S40 i seem to remember it had that unit dangling from the cut wires (the breaker just cut the wires rather than unplugging the light)
I no longer have a 40 series so can't check, but worth having a good look around the rear lights themselves, but i'll apologise up front if thats a wild goose chase