Evo X switch LED polarity help

[gange]

A friend in America is changing the LEDs in my switches for me but has a bit of a problem. As he doesn't have the IC spray button so he doesn't know which terminal is + or -.

As LEDs only work one way and I don't know how to test them, does anyone know which terminal is which ?

He has wired my AWC button and tested it but doesn't have a ASC OFF button and again can't tell which is + or -. As the circuit boards of the 2 switches are similar he is hoping that they are wired the same way. Can anyone confirm this?

I am no help as this is out of my league Any help from you electronic geniuses would be much appreciated .

cheers

ps. I have photos but can't get them attached

[el3ment]

Im not following. Does he want to know where on the switch circuit board the positive side and negative side is? Why not just plug it in and use a multimeter to measure the contacts?

[gange]

He can't do that in America as they don't have the intercooler spray switches and setup as standard like we do in oz.

And I don't know how to do it on my car

[gange]

I seem to recall that the green and white striped wire on each of the plugs for the buttons is the positive for illumination. Ill have a look in the workshop manual when I get home.

Thanks mate