Anti-Lock Brake System: Operation

ABS warning light will be on for about 3 seconds after ignition is turned on. ABS warning light will also be on for about 3 seconds after engine is started. A slight "click" may be heard during system initialization. System initialization is run 2-3 seconds after engine starts. If brake pedal is depressed when engine is started, system will not initialize until brake pedal is released or vehicle accelerates past 3 MPH. If brake pedal is depressed when system is initializing, system initialization will be interrupted and slight movement may be felt in brake pedal.

During normal driving and braking operations, ABS-VI functions like a conventional braking system. Each wheel sensor constantly sends AC voltage signal to the EBCM, which then translates this information into wheel rotation speed. When EBCM detects wheel lock-up, it activates the appropriate motor and solenoid to regulate hydraulic pressure to each front wheel or both rear wheels. The pedal pulsation felt with ABS application is normal.

If EBCM detects a system malfunction, ABS warning light will either flash or illuminate continuously to alert driver of a system malfunction. A flashing ABS warning light indicates a system failure has occurred which may have degraded base brake performance, vehicle should be serviced immediately to regain full base and ABS braking. A continuously illuminated ABS light indicates a system failure is present and ABS system is disabled.

Red BRAKE warning light will illuminate when low brake fluid level is detected, park brake switch is closed, or ignition switch bulb test is cycled. Light can also be turned on by EBCM if certain ABS codes are set. BRAKE warning light normally indicates a hydraulic or mechanical failure is present.