I used to have the idea of honor, but thats just because it was the general opinion out there that they had it. However, after your thread about the HIsh, I deffinatly dont see it. They are hunters, and there is little 'honor' in their actions. Not being in the mind of a pred we cant really say if they leave the pregnant, or the old and sick or unarmed alone because of an honor code, or because they arent worth the hunt.
Untill you consider the self-destruct. They have been defeated, yet they will not accept it with the samurai code of honor they are often branded with and take their own life, but they destroy and kil their prey and anyone else thats within the blast radius, with no concern about the condition of the people in it.
The show respect to some degree. In P2 they let Harrigan go. This too could have just been because he was tired and injured and outnumbered, at this point they wouldnt be hunting him fo rht egame, just killing him. They let him go and left it to him to get out of the way of the fire from their ship as they took off.
To a small degree, Id say they have a sort of honor and respect, but more as a result of their practice as hunters and only wanting to hunt 'whats worth it' rather than an actual binding code they have.