PS4 controller LED

[Imled]

Hi,

I already have my mod done for the xbox one and I've been trying do it for a PS4 controller for rapid fire with a PIC but I've been having trouble. I have been trying to scrape the black carbon off pad 18 for right trigger and solder a wire to it and test the signal. Strangely enough, just by soldering a wire to it, it will cause the right trigger to stop working completely. If I then desolder it and try again it will work again.

I cannot for the life of me figure out what is happening.

Any info?

Thanks