Just thought I'd throw this out for any ideas:
I'm looking at a 2011 (possibly buy) xc90, 3.2 L with only 170k on it .... but the owner cannot get a safety inspection done due to the following indicated failures....
ABS light (probably true... due to a sensor)
Traction Control failure
Battery Indicator
"Brake Failure" stop driving immediately (something like that anyway)

Actual observed failures:
Power locks (with key fob and control buttons)
Upper Brake lite
Rear running lights, Including marker lites in bumper. (brake lights are OK)
Horn

Car starts, runs , and drives completely fine.
Brakes function... Battery IS charging
I'm in the middle of getting VIDA to run on my computer..... but in the meantime I;'m just looking for some opinions on a common point of failure that may cause all of these symptoms.
I can't see multiple failures causing all of this..... there has to be a common thread here.