GM Service Manual Online
For 1990-2009 cars only

Brake Warning Indicator

The instrument panel cluster (IPC) illuminates the brake warning indicator when one or more of the following occurs.

    • The IPC detects that the park brake is engaged.
    • The electronic brake control module (EBCM) detects a low brake fluid condition. The IPC receives a class 2 message from the EBCM requesting illumination.
    • The EBCM detects an ABS malfunction which disables dynamic rear proportioning (DRP). The IPC receives a class 2 message from the EBCM requesting illumination.
    • The IPC performs the bulb check at the start of each ignition cycle. The brake warning indicator illuminates for approximately 3 seconds before turning OFF.
    • The IPC detects a loss of class 2 communications with the EBCM.

Service Brake Soon Indicator

The EBCM illuminates the service brake soon indicator whenever one of the following occurs.

    • The EBCM performs the bulb check at the start of each ignition cycle. The service brake soon indicator illuminates for approximately 3 seconds before turning OFF.
    • The EBCM detects a disabling malfunction in the hydromax brake assist system.