See Figure 1
The following steps must be checked and done before diagnostic procedures can begin.
- Verify that the parking brake is fully released.
- Check the condition of battery, cables and connections.
- Check the brake fluid level. As brake fluid level falls the red BRAKE indicator will be illuminated. If fluid level continues to fall the amber CHECK ANTI-LOCK BRAKE indicator will illuminate.
- Verify that all the following connectors are connected and terminals are secure in the connectors:
- Check that the fuses and diodes are not damaged.
- Check the ground connections on the front end of the hydraulic unit and in luggage compartment, and the small black wire from the negative post of the battery to fender apron. Then, check the two main wires plugged into the harness connector.
The anti-lock control module monitors the system operation and stores up to seven different service codes in its memory. However it cannot store two service codes with the same first digit, except for 40's service codes.
Example: The module cannot store a code 25 and code 26 at the same time. It can, however, store a code 25 and code 35. If code 25 were stored first it would have to be serviced before the code 26 can be stored. A valve service code will override any stored service code during self test. The condition must be serviced before any other codes can be displayed.
After all codes have been displayed and serviced, the memory can be cleared by driving the vehicle above 25 mph.