Initial Inspection and Diagnostic Overview

1. Verify customer concern by driving the vehicle.
2. Visually inspect the components of the anti-lock brake system (ABS).
Mechanical
- Low brake fluid
- Damaged brake anti-lock sensor
- Damaged hydraulic anti-lock actuator assembly
- Damaged hydraulic brake line(s)
- Damaged wheel bearing
Electrical
- Blown fuse(s):
- 10A ELECTRON (IGN)
- 15A STOP LAMP
- 10A RELAYS
- 20A ABS
- 30A ABS
- Blown anti-lock brake warning indicator miniature bulb
- Damaged wiring harness
- Loose or corroded connections
- Damaged or corroded relays

3. Check the hydraulic brake lines for fluid leaks.
4. Check for problems in other areas that may affect the ABS, such as:
- Suspension and steering components.
- Tire integrity and air pressure.
- Wheel bearings.
- Brake components that are common to all brake systems.

5. Check the wiring harness for obvious signs of shorts, opens, bad connections, or damage.
6. If fault is not visually evident, determine the symptom and refer to the symptom chart. Symptom Related Diagnostic Procedures