ABS Warning Relay

The ABS warning Relay (K103) circuit ensures that the ABS warning light illuminates if the Anti-Lock Brake System ECU (Z108) loses power. If the Warning Relay is not energized, the warning light illuminates because it is grounded at E300 through the BS wire and the relay's closed contacts. When the Warning Relay is energized, the relay's ground path. The Warning Relay is energized whenever the ABS Load Relay (K101) is energized.

The load Relay is energized when the ignition is in position II. Voltage from fuse F2 is now applied to terminal 9 of the ECU. This signals the ECU to energized the Load Relay by applying voltage from terminal 8 to the coil of the Load Relay. With the Load Relay now energized, fuse F1 applies voltage to the Warning Relay to energized through the NK wire.