Your car has a variant of the layout shown below. Not sure, but I reckon the B pillar vents (no. 28 in diagram) are probably fed from the front regardless of whether rear controls are fitted.
The rear centre vents are no. 15 and it's not obvious how the airflow for these is controlled whether by a separate fan (unlikely?) or flaps in the front which are controlled by the rear panel.
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MY17 XC90 D5 Powerpulse Momentum: SENSUS, Osmium Grey, Blond, Walnut, Xenium, BLIS + CTA & RCM, Winter Plus, Fuel-fired Heater, Heated Rear Seats, Power Extensions, Tinted Windows
Coming soon: XC60 Ultimate Recharge MY24
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