Indicator Lights: Anti-Lock

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1999 Oldsmobile Bravada, 1999 GMC Sonoma, 1999 GMC Jimmy, 1999 GMC Envoy, and 1999 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.

Light Emitting Diode (LED) is controlled by Instrument Panel Cluster (IPC), using information sent by Electronic Brake Control Module (EBCM) on Class 2 serial data line. If light is on, brake system will still operate, but without anti-lock assistance. As a check, LED illuminates for 3 seconds after ignition is turned on. LED illuminates when one or more of the following conditions exists:

Anti-lock brake system related DTC is set.
Instrument cluster cannot communicate with EBCM on Class 2 serial data line.
Instrument cluster receives a Class 2 serial data message from EBCM requesting ANTI-LOCK indicator on.

WARNING: If BRAKE light is on, ensure brake hydraulic system is okay before driving vehicle.