My 2001 S60 just had the same issue. The "check brake light" error message on the dash and the brake lights not illuminating ( the upper center glass brake light would). I found that both bulbs had failed which I replaced. The fuse was okay but still the error message was found on the dash when the brake peddle was pressed. I purchasing a dealer $30.00 brake light relay and the problem is fixed. However, there isn't a diagram anywhere that shows which relay was for the brake light relay. In my 2001 S60, the relay is in the trunk, beneath the driver side removable upholstered cover. The relay panel has ~ 10ea of the same relays and a few other odd sizes. There is a vertical column of relays on the left and right. I found the brake light relay is located between two other relays on the upper right column. It was difficult to reach due to a larger relay on it’s right.
Upper brake light works fine, lower brake lights don't work at all,
with CHECK BRAKE LIGHTS warning every time you step on the brake:
In the trunk, remove the fuse access panel on the drivers side.
The fuses are on the left, and on the right is a black board with a
number of cube, rectangular and flat (card?) switches that plug into
the board.
On my 2001 S60 T4, there are four flat card switches near the top; one
by itself, then a space, and then three in a row (see below):
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When I began pulling the bottom one out, the lower brake lights worked
and the warning went out. If I re-seated it completely the problem came
back, but if I wiggled it out just a bit the problem goes away.
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