For 1990-2009 cars only
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:
- Review the system operation in order to familiarize yourself with the system functions. Refer to the following:
| • | There are no DTCs set. |
| • | The control modules can communicate via the serial data link. |
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 . |
| • | Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom. |
| • | 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 .
Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
Gages
Indicators
| • | Service Indicator Always On for the NVG 226-NP8 transfer case |
| • | Service Indicator Inoperative for the NVG 226-NP8 transfer case |
| • | Malfunction Indicator Lamp (MIL) Diagnosis for the 4.2L engine |
| • | Malfunction Indicator Lamp (MIL) Diagnosis for the 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L engine |
Driver Information Center
Driver Information Center (DIC) Switch Malfunction
Instrument Cluster Dimming
Interior Backlighting Malfunction
Odometer
Odometer Trip/Reset Switch Inoperative
Audible Warning
