Chevrolet Sonic manuals

Chevrolet Sonic Repair Manual: Brake Warning System Description and Operation

Chevrolet Sonic Repair Manual / Accessories / Storage / Brake Warning System Description and Operation

Brake Warning Indicator
Brake Warning Block Diagram

B80Park Brake SwitchB20Brake Fluid Level SwitchK9Body Control ModuleP16Instrument Cluster
Hard-Wired
Serial Data
B80 Park Brake Switch
B20 Brake Fluid Level Switch
K9 Body Control Module
P16 Instrument Cluster
(HW) Hard-Wired
(HW) Hard-Wired
(DA) Serial Data
(B80) B80 Park Brake Switch
(B20) B20 Brake Fluid Level Switch
(K9) K9 Body Control Module
(P16) P16 Instrument Cluster

The instrument cluster turns the brake warning indicator ON when the following occurs:

  • The instrument cluster performs the bulb check. The brake warning indicator illuminates for 5 s.
  • When the Electronic Brake Control Module (EBCM) detects low brake fluid level it sends a serial data message to the instrument cluster, which will illuminate the red brake indicator.
  • The Body Control Module (BCM) detects that the parking brake is engaged. The instrument cluster receives a serial data message from the BCM requesting illumination.
Driver Information Center Messages

When the Electronic Brake Control Module (EBCM) detects low brake fluid level it sets DTC C0267 and sends a serial data message to the Driver Information Center , which will display Brake Fluid Low message.

Brake System Warning Light
The vehicle brake system consists of two hydraulic circuits. If one circuit is not working, the remaining circuit can still work to stop the vehicle. For normal braking performance, both circuits ...

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