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What does PD3 in this schematics do?

Question asked by Tommy Vaughn on Mar 29, 2018

Sorry if I'm posting at the wrong forum but I'm having a hard time finding out what PD3 pin do in this product:… 


I'm working on my own STM8 firmware, and are using PD4 and PD5 to control the current by turning them on and off in a tandem fashion. It didn't work because the PD3 wasn't used - and we thought previously that PD3 doesn't really matter, now it seems it very much does.


A little help?