The diagram clearly shows
Device 16/18 (Subwoofer)
Pin 21 Y+R is permanent 12V
Pin 22 R is switched 12V
Pin 23 SB is ground
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XC90 R-Design MY2009, Black Sapphire Metallic. HP-Sound, RSE, Nav, Tel, ParkingCam, BLIS, ParkingHeater, RestHeat, Removable Towbar, Summer: CRATUS 20x8 on Pirelli Scorpion Zeros 255/45, Winter: NEPTUNE 17x7 on Continental WinterContact 4x4 235/65.
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