Important: The following steps must be completed before using the symptom tables.
|        -  | The control modules can communicate via the serial data link. | 
 
|     •  | Review the system descriptions and operations in order to familiarize yourself with the system functions. Refer to one of the following system operations: | 
 
Visual/Physical Inspection
|     •  | Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom. | 
 
Intermittent
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to 
Testing for Intermittent Conditions and Poor Connections
Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom: