2012 Kenworth smart wheel

HI guys:
I would like some advice or if somebody has the wiring diagram for this truck would be awesome...

Smart wheel stop working completely there's no lights on it, no city horn, no jake brake no cruise control...
however....
When I'm driving on a rough road or make a left horn sounds like pulsations .._...__.. and the jake brake works for a while, I know is a short but I don't know where to start checking.
I suspect the problem could be under the wheel inside the plastic covers on the steering column ..?

 

That is so weird I just fix it today , it was the clockspring, bought it on Kenworth dealer for $350.00 and 1 hour wondering around I had to take the instrument panel out to reach the other end of the wiring and rented a steering wheel remover at autozone.

Thank you