Important: The following steps must be completed before using the symptom tables.
- Perform the  
Diagnostic System Check - Vehicle 
 before using the
Symptom Tables in order to verify that   all of the following are  true:
 
| •  | The control module(s) can communicate via the serial data link. | 
 
- Review the system operation in order to familiarize yourself with  the
system functions. Refer to 
ABS Description and Operation 
.
 
Visual/Physical Inspection
|     •  | Inspect the easily accessible or visible system components for  obvious
damage or conditions which could cause the symptom. | 
 
|     •  | Inspect the master cylinder reservoir for the proper brake fluid  level. | 
 
Intermittent
Faulty electrical connections or wiring may be the cause of intermittent  conditions.
Refer to 
Testing for Intermittent Conditions and Poor Connections 
 in Wiring Systems.
Symptom List
Refer to a symptom diagnostic procedure from the following list in order  to
diagnose the symptom: