PC Lirr M7 Wiper Controls Are Between The Detents On The Rd Switch

The wiper switch on the RD has three detents. It seems that someone is using values other than the detent switch positions as you have to juggle the switch into non detent position between 2 and 3 to turn off the wiper. This should only use one of the detent positions. I'd suggest off/intermittent/on.

 

I've just started playing LIRR now that it's RD compatible.

That explains that. I had to revert to the keyboard to turn my wipers off!