What is this 让 in this text? A strange old 听力 from a bygone era it seems, but this 通过让座者时 is holding me up, I can't get a handle on it. How is it meant?

到电影院看电影，观众应尽早入座。如果自己的作为在中间，应当有礼貌地向已就座者示意，请其让自己通过。通过让座者时要与之正面相对，切勿让自己的臀部正对着人家的脸，这是很失礼的。

请其让自己通过。 ask him let self/one pass

This next bit, I can't quite fathom how it is meant in Chinese. Is 让 here 'let' or 'by' or both? Is the 座者 the person seated, or the one who wants to get to his seat? The more I listen, the more confused I get! Help!

通过让座者时 = pass let seated (person) time =  

OR 

通过让座者时 = pass by seated person time = as you pass by the seated people, (show 'em your face and not your arse,) 

Maybe this '通过让座者时' can be written '通过让的座者的时‘？？

Could one of you perhaps rewrite it in a clearer fashion?
I believe this usage of 让座者 is very inaccurate. It is referring to the people who lets you past. 

However I couldn't think of a clear and succinct phrase for the same meaning. None of 让位, 让路, etc. sounds right. If rewrite the phrase I would simply go with 其他观众.


  通过其他观众时要与之正面相对，……