[thstone]

The brake wear light is the most simple circuit possible: If there is continuity, then the light is off. If the light is on, then continuity is broken somewhere in the wiring, connectors, or sensor itself. That's all there is to it. No computer, no software, no real sensors, no feedback loop - just a simple wire checked for continuity.

You'll have to re-check each sensor and connectors to find the cause. I usually swap sensors from wheel to wheel to find the bad sensor or in doing so, you'll eliminate the sensor that wasn't making a complete connection. Swap around, re-connect, and the odds are good that the problem disappears.