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Looking at the sketch in my Volvo Service Manual Wiring Diagrams for 960/
S90/V90 1997-1998,
The sensor looks to be near the power antenna motor and a fuel inlet pipe.
Left rear fender, back from the wheel well. You will neeed to remove the carpet and vertical panels to get at it.
Picture shows a square thing aound the size of a cigarette pack. It has one connector with a gang of wires to it.
Power from the brake light switch comes in a Yellow-Brown wire, which is probably inside a harness. It connects to terminal #10. Check that there is 12 volts present to either clear or indict the brake light switch.
Good Luck,
Bob
:>)
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