Brake Fluid Level Sensor

If the brake fluid in the reservoir falls to a predetermined low level, the switch contacts close. Closed contacts provide a ground signal to the Body Control Module/Gateway Module (BCM/GWM). The BCM/GWM then sends a signal to the Instrument Cluster (IC) and to the Anti-Lock Brake System (ABS) control module. This signal is transmitted on the High Speed (HS) Controller Area Network (CAN) chassis systems bus. On receipt of the signal:

• The IC illuminates the red brake warning indicator and the message center displays the critical warning indicator (red warning triangle) and the message Brake Fluid Low.
• The ABS control module disables Dynamic Stability Control (DSC) functions. At the same time it sends a HS CAN chassis systems bus signal to the IC to continuously illuminate the DSC warning indicator.