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Do you have it on dual, and is there some reason (like shade differences) that the passenger side would be warmer therefore triggering AC on that side. I presume all the vents are equally open.
Wrong forum, you should check with the second gen RX page.
If it's on auto and not set for dual, then you should bring it back to the dealership for warranty repair.
we had this problem in our 08 Avalon. took it in for repair and they couldn't find anything wrong. then they decided to check the freon levels...sure enough, they were low. they re-charged the A/C and added dye. we'll keep an eye on it. all under warranty. apparently when the freon is low, only one side will blow out cool air. why the hell it's the passenger side and not the driver side is beyond me.