Important: The following steps must be completed before using the symptom diagnostic tables.
- Before using the symptom diagnostic tables, perform the Vehicle Diagnostic
System Check test 
Diagnostic System Check - Vehicle 
in Vehicle DTC Information in order to determine that there are no DTCs set, and that
the control modules can communicate via the serial data link.
 
- Review the system operation in order to understand the system functions.
Refer to the following description and operations:
 
Visual/Physical Inspection
|     •  | Inspect for aftermarket devices which can affect the operation of the
instrument panel cluster or the audible warnings system. Refer to 
Checking Aftermarket Accessories 
 in Wiring Systems. | 
 
|     •  | Inspect the accessible system components or the visible system components
for obvious damage or for obvious conditions which can cause the symptom. | 
 
|     •  | Inspect for the proper fluid levels. | 
 
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:
Gages and Odometer
Indicators
Driver Information Center
Audible Warnings