[wparsons]

Originally Posted by KoolBRZ

I think you need to unplug and replug your stability control sensors. You can locate them in this PDF, "http://www.ft86club.com/files/BRZwiringi.pdf". The front sensors are labeled A42 LF, A12 RF, for the front, and G9 LR, H12 RR, for the back. You'll find a diagram of locations on page 39 for the fronts, and 44 for the left rear, and 45 for the right rear. One of these connectors was likely dislodged during your recent spring install. Inspect the wires closely because maybe a wire was cut or pinched during the upgrade. It's very unlikely that the VSC controller itself is affected, and much more likely that a sensor or connector was.

From the diagrams, it looks much more likely for the rear speed sensors to have been dislodged, then the front ones. I would suggest checking those first, the VSC is also under the hood next to the LF speed sensor, if that's come loose it will also cause problems.

If it were a wheel speed sensor it would be doing something very different. If one (or more) of them are unplugged it'll how up as soon as you start the car, and VSC/TC will be disabled entirely since it can't figure out what to do with one (or more) sensors down.