'16 XC70, T5, 2.5 liter, 5-cyl Working on 40k mi. service:
changed oil & filter, air filter; ck. &/or top up other fluids; multiple inspections. R&R 🤬 cabin filter. Remembered how much easier the latter is if you remove the glove box (8 fasteners). Reassemble.
Get an
ESC service required msg on test drive

. Everything seems to work except for
Adaptive Cruise Control unavailable msg. Recall that there'd been an arc when I reconnected the aqua-colored 2-wire plug into fuse block A. Assumed blown fuse. Note to self: disconnect battery next time.
.
Looked without success online for wiring diagrams . . . source?
.
Slither back under the dash. All fuses test OK. Above-mentioned plug
may have been loose. No msg. on short test drive. Will revisit issue tomorrow.
Edit: more extensive test drive this morning. No messages and ACC works so I assume that the suspected loose connector was the culprit.