Warning System

A secondary system, using vehicle's brake warning light will warn driver of certain types of failure in system. Brake warning light comes on under following conditions:

1. If pressure modulator is activated (diaphragm and plate move to the rear) in absence of a brake light signal (brake pedal not depressed).
2. If ECU sends a signal to open modulator air valve and does not send a subsequent signal to open by-pass valve.
3. If electrical continuity of air valve lead wire is broken.
4. If there is a blown fuse, loose connection, break in wire, or open circuit between ignition switch and ECU.