Anti-Lock Brake System: Operation

ABS warning light will be on for approximately 3 seconds after ignition is turned on. ABS warning light will also be on for approximately 3 seconds after engine is started. A slight "click" may be heard during first part of system initialization. The rest of system initialization is run when vehicle accelerates past 3 MPH. If brake pedal is depressed when engine is started, system will not initialize until brake pedal is released. 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 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; however, ABS operation is not immediately affected. 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, ignition switch bulb test cycle, or when EBCM turns light on when certain ABS codes are set. BRAKE warning light normally indicates a hydraulic or mechanical failure is present.