ABS Main Relay Circuit Operation

CIRCUIT OPERATION
The ABS main relay is located in the Power Distribution Center (PDC). When the Controller, Anti-Lock Brakes (CAB) grounds the Anti-Lock Brakes System (ABS) main relay coil on circuit B58, the relay switches to connect circuit A20 from PDC fuse 14 to circuit B47. Circuit Fl2 from fuse 11 in the junction block splices to feed the coil side of the ABS main relay Circuit B58 connects to cavity 11 of the CAB.

Circuit B47 splices to power to the coil side of the ABS pump motor relay. Other branches of circuit B47 connects to cavity 5 of the CAB and to the hydraulic control unit.