Circuit Operation

CIRCUIT OPERATION
Power for the Anti-Lock brake system is supplied by two fuses. There is a 15 Amp fuse located in the fuse block cavity 10. This fuse supplies power to the Controller Anti Lock Brake (CAB), and the ABS system relay on the F12 circuit. The F12 circuit also supplies power to the Powertrain Control Module (PCM). Power for the fuse is supplied on the A21 circuit from the ignition switch. This fuse is HOT in the START/RUN position.

The second fuse is located in the Power Distribution Center (PDC). It is a 40 Amp fuse. This fuse is HOT at all times and supplies power to the contact side of the ABS pump motor relay.

There are three grounding points used in the ABS system. One is a case ground on the CAB. The second is the Z12 circuit at the CAB connector cavity 5. This ground is spliced, and terminates at the left side of the radiator closure panel.

The third ground is on the Z1 circuit. This ground is used for the ABS hydraulic modulator, ABS system relay, and the ABS pump motor. This ground, like the Z12 ground splices and terminates at the left headlamp ground.