Hey guys it’s been a while but I’ll post up some info I attained while doing this to my own car.

This is pretty much a standalone ecu only option if you wish to use it.

** I take no responsibility for any damages done to anyone’s vehicle if they attempt to do this and something becomes messed up**

First things first. My vehicle is a 2006 Evo 9. I cannot confirm wiring will be exactly the same between earlier 8 models. Just check your wiring with a voltmeter before cutting.

Now function. I wanted to use the “pull” function of my wiper switch to activate my rolling antilag, and then the release of the spring loaded switch would be the “let go” or disarm. Easier said— pull the switch, build boost, let go— go fast..

The issue as you may know, when the switch is pulled the wiper spray function works and the wipers wipe. I did not want these working while I was using the rolling antilag.

So I disassembled my steering column and the switches and found the wire I needed to use.

Info on this,,, I believe every function of both multifunction switches are all “ground based” there is one common ground that comes into the left side switch from the little plug and plugs into it. That ground then crosses over to the right side switch, all switch inputs complete a different ground path to the ecu.

Soo I found the wire that completes the ground when I “pull” the switch. It’s a “black” wire behind the plastic module that holds the clock spring and steering angle sensor. I’ll post a picture.

Soo steering wheel needs to come off, easy to do, if you aren’t sure how search the forums and the answers are out there. After the steering wheel is off you will need to remove both function switches just to get them out of the way. Again easy, forum search. Next is a single Philips screw on top and then two release tabs at the lower area and the whole module assembly will come off. ***Try to keep the clockspring and steering angle sensor straight*** you may need to unplug a few plugs but again easy enough to do.

Find the black wire for the right side wiper function switch and cut it in the middle. Then splice this wire as a direct input to your standalone ecu and configure it as an on off function. Check that it works as should and put it back together. If everything goes well you will be able to pull the switch and the wipers will not wipe and the sprayer will not operate, but your input to the ecu should complete its action.

Now all other wiper functions will still work as normal so your wipers will still work at the selected speeds.

What about the use of the sprayer. Well small sacrifices are made for race car! The method I use is I simply switched the rubber hoses from the rear wiper spray pump to the front one. Now when I want my front wiper spray to spray. I activate my rear wiper spray and the front sprayer works. The rear wiper spray function will now be inoperable. That’s even if you still have a rear wiper these days, which I do not. I also used the rear wiper “on” function of the switch as a boost level switching input. So off is low boost, on is high boost. I’ll post a picture of that wire also but it is “orange” in my car and the setup will be exactly the same, cut, splice and configure it to your standalone ecu.

I hope this helps anyone who may want to use the same functions to operate a rolling launch or something other.

Pictures of the wires…

 

Nice write up, I wonder if there would be a easier location to do the splice at. Maybe I'll see if I can trace that wire to easier accessible connector.

 

Definitely a good idea, I need a good spot for antilag