Circuit/System Description

The brake fluid level switch monitors the level of brake fluid in the master cylinder. When the electronic brake control module (EBCM) sees the brake fluid level switch input grounded, it sends a serial data message to the body control module (BCM) and the BCM sends a serial data message to the instrument panel cluster (IPC) to turn ON the Red Brake Warning indicator.

The BCM sees the park brake switch input grounded and sends a serial data message to the IPC requesting illumination of the Red Brake Warning indicator.