ABS inspection and testing (Discovery 3)

1. Ensure that the customer's complaint is valid.

2. Visually inspect for obvious mechanical and electrical problems.

Mechanical factors	Electrical factors
Tire size, condition and installation Wheel speed sensor status and installation Steering Angle Sensor (SAS) Status and Installation Status and installation of the yaw rate sensor and accelerometer Condition and installation of the hydraulic control unit (with ABS module attached)	Fuses and fuses Wiring harnesses and electrical connectors Operation of the control lamp Wheel speed sensors Central electrical distribution box HDC switch DSC switch Brake light switch Yaw rate sensor and accelerometer Steering Angle Sensor (SAS) ABS module CAN electrical circuits (Control Area Network)

3. If an obvious cause for a problem you have identified or a problem described by a customer is found, resolve it before proceeding further. (if possible).

4. Use the approved diagnostic system or scan tool to retrieve all diagnostic trouble codes (DTCs) before accessing the DTC Index. Clear all DTCs after troubleshooting.