Antilock Brake Diagnosis

1. Verify that the parking brake is completely released. If the parking brake is applied, the ``Brake'' lamp will be illuminated.
2. Check brake fluid. As the fluid level drops, the red ``Brake'' lamp will illuminate. If fluid level continues to fall, the amber ``Check Anti-Lock Brake'' lamp will illuminate and the anti-lock function will be inhibited.
3. Verify that all of the following connectors are properly connected and in good operating condition:
a. 55 pin connector of the computer module.
b. 19 pin connector of HCU valve body.
c. 4 and 7 pin connectors of pump motor relay.
d. 3 pin connector of master cylinder reservoir.
e. 2 pin connector of HCU reservoir.
f. 5 pin connector of main power relay.
g. 2 pin connector of each wheel sensor.
h. 2 pin connector of pedal travel switch.
i. 2 pin connector of stoplamp switch.
4. Check that the fuses and diode are not damaged.
5. Ensure all battery connections are clean and tight.
6. Check ground connections for anti-lock system located near computer module and pump motor relay.