I'd say it will make a difference, WIS Wiring shows the blinkers connected to the PSE so my educated guess is the PSE drives them under lock / unlock confirmation, and ATA sends Alarm Signal to PSE upon trigger
I can't say for definite on R170, but on other MB's with the same Siren, I have found when the Alarm is set and Siren dies this visual flashing keeps on until the siren has been changed, faults cleared and then and re version coded if you want chirp, conversely if siren dies when not set, like my W220 did recently when in the workshop unlocked for a few days, that one did not keep flashing the indicators
Be good to find out for sure on R170's
Trouble here is MB do not release much info on their Security which is understandable, but also a Royal PITA sometimes.
BTW FWIW, R170 is electronically similar to V Class W638 with things like DAS 2 and Alarm etc, a lot of HHT Win use on the W638, so I'd imagine if you find a post about a W638 doing this then the fix will likely be similar, although they do not have PSE, ATA is still the same
HTH, Cheers Dave