Yeah body control is the CEM (central electronic module) on Volvo.
What are the symptoms?
I'm pretty sure XC90 is up under the driver's side dash above accelerator pedal.
Google xemodex xc90 CEM removal There's a video showing how to get to it.
You can't fit 2nd hand and they kinda need a "handshake" but only Volvo dealer can do it so easier to get yours repaired.
You can send them overseas to be cloned.
Injectronics can repair them locally