Excessive whine and front end vibration after installing TOD-off switch

[PK]

I dunno, I've heard of cases where it gets completely fixed just by putting all the same tires on the car.

I think this is your main problem from the start, and mucking about with the TOD wiring has now introduced another problem.

I suggest you put the TOD wiring back exactly as if was, and get your tye replaced.
Just for interest sake, what is the size difference between the 3 tyres, and the spare??

These TOD systems have been known to play up just because tyre pressure is down a little bit on one wheel. With a different OD tyre, all hell breaks loose.

Good luck.

Oh - and welcome to the forum.

PK