The ABD Controller will be underneath the lefthand lower cargo trim. Your '17 won't be much different (if at all) from a '16, see DLK-20 here:
https://www.nicoclub.com/service-manual ... %2FDLK.pdf
I must warn you, unless there's a water intrusion issue, it's
extremely doubtful the ABD C/U is causing any issues. The common problems are (in order) bad half-latch and/or open-close switches in the latch, bad encoders in one or both spindles, a bad cinch motor in the latch, or spindle leakage/motor failure. The ABD is active on the CANbus, you should get codes pulled from it before throwing very expensive parts at it.
The cargo panels on a '17 shouldn't really be any different from a '16 ('14~'17 use identical part numbers for the lower finishers). See INT-34 here:
https://www.nicoclub.com/service-manual ... %2FINT.pdf