PCS w/PD Validation on TSS 2.5+

[Feel]

We have 2023 Toyota Camry Hybrid LE. Bought it brand new.

Here is my issue:  I have never gotten any warning lights or beep from PCS despite verifying all the settings ever although I have been close enough to other vehicles in few occasions hard pressing the brakes with no assist I can tell of. My Honda CR-V in similar situation visually alerts me, not sure they are more sensitive. I have changed the setting to high sensitivity, farthest distance and all. Nothing seems to work.  How can I validate that PCS w/PD is actually working. I have a feeling it is not but hard to prove before I take it to dealership. Less than 5K miles on it. Just trying to make sure it is not faulty and be of help when I actually need it (knock on wood).  How difficult and expensive is it to fix? It should be covered under warranty I presume. TIA for any info.