I can't speak for you rig, but this is how mine operates.
If you push the wipe once button (it will cause the windshield wiper to cycle once). The next time you push it (let's say in 30 seconds), it then sets the intermittent cycle to wipe once every 30 seconds. Pretty cool if you ask me.
Pat and Judy, Molly and Emma
2000 Monaco Dynasty-2007 Lexus GX470
Winter S/W Florida....Summer Eastern Tennessee