Important: The following steps must be completed before using the symptom tables.
- Perform 
Diagnostic System Check - Instrument Cluster 
, 
Diagnostic System Check - Driver Information Systems 
, or 
Diagnostic System Check - Audible Warnings 
 before using the Symptom Tables in order to verify that all of the following are true:
 
| •  | The control modules can communicate via the class 2 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 Instrument Cluster or Audible Warning Systems. Refer to 
Checking Aftermarket Accessories 
 in Wiring Systems. | 
 
|     •  | Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom. | 
 
|     •  | Inspect the reservoirs for the proper fluid level before beginning diagnosis. | 
 
|     •  | Inspect the applicable reservoir for the proper fluid level related to the indicator or message. | 
 
|     •  | Verify that the indicators work 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 
 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
Instrument Cluster Dimming
Audible Warning