Brake Fluid Pump Relay: Description and Operation

CIRCUIT OPERATION
The ABS pump motor relay controls when the pump motor runs. Power for the coil side of the relay is supplied from cavity 47 of the Controller Anti Lock Brake (CAB) on the B120 circuit. This circuit also supplies voltage for the contact side of the system relay. The ground side of the coil is controlled by the B116 circuit. Circuit B116 connects to cavity 16 of the CAB connector.

Circuit B10 from the relay box powers the ABS pump motor. This circuit is also used as an input to the CAB for pump motor monitoring.