My understanding is they all are ready to receive the volvo standard wiring. Don't risk messing with anything else.
- it comes in two parts. You could (might have changed) have 7 or 13 pin, then you added a tow bar module that connects to the rear fuse panel.
No software needed.
Search on here for install threads or the official volvo accessory pages used to have the installation instructions. Their instructions were very simple to follow, but you don't need to dismantle all the inside rear trim panel to get to the fuse panel.
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