Important: The following steps must be completed before using the symptom tables.
- Perform the 
Diagnostic System Check - Vehicle, before using the symptom table in order to verify that all of the following are true:
 
| •  | The modules can communicate via the serial data link. | 
 
- Review the system operation in order to familiarize yourself with the system functions. Refer to the following:
 
Visual/Physical Inspection
|     •  | Inspect for aftermarket devices which could affect the operation of the audible warnings, driver information center (DIC), or instrument panel cluster (IPC). Refer to 
Checking Aftermarket Accessories. | 
 
|     •  | Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom. | 
 
|     •  | For any indicator or message relating to fluid level, perform a visual inspection of the fluid level before beginning diagnosis. | 
 
|     •  | Verify that the indicators and the message display works properly during the displays test. | 
 
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:
Audible Warnings
Gages
Indicators