I have a 2006 XC90 and my Central Locking and rear power windows are not working. I just finished changing my starter motor where I unhooked the battery for abt 2hrs. now doors doors dont lock with any of "door lock" button at driver or front passenger or with remote. checked fuses in cargo area where manual says fuse for central locking is. Also, I cant open cargo door either. manual latch (with red botton) from inside wont open it.

 

I found the problem. Because I caused a small spark while changing my starter motor; which reminded me to disconnect battery (my bad), and new starter motor didn't work! remembering the spark I went right to checking fuses. It was a sloppy job on my part because I couldn't believe new motor was bad or that I may have hooked it up wrong ( which I did) so I went beyond checking just the obvious starter fuse and checked many other fuses which ultimately led to putting fuse #5/cargo panel in wrong place.
Lessons learned:
1. While checking fuses put the damn thing back where it belongs and trust the panel map. If it's not related, leave it alone.
2. After market Starter motor has two blade connections, where the orig Volvo has just one; so, make sure you connect correct one.
3. It's always something simple!
OMG !
All is good