If the XC90 is the same as the V70 & XC70 then a 2007 car will not have the trailer module fitted as standard, the official Volvo wiring kit will have a harness to go between the REM and the trailer module , the trailer module it's self and a hardness to go between the trailer module and the towing socket.
Only the earlier cars up to 2004 had the trailer module fitted as standard and only required the wiring harness extension to be fitted that linked the harness in the back of the car to the towing socket.
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