A Symptom Diagnosis

SYMPTOMS

IMPORTANT: The following steps must be completed before using the symptom tables.

1. Perform the Diagnostic System Check - Vehicle in Vehicle DTC Information before using the Symptom Tables in order to verify that all of the following are true:
- There are no DTCs set.
- The control modules can communicate via the serial data link. Diagnostic System Check - Vehicle
2. Review the system operation in order to familiarize yourself with the system functions. Refer to the following:
- Instrument Panel Cluster (IPC) Description and Operation
- Indicator/Warning Message Description and Operation
- Driver Information Center (DIC) Description and Operation
- Audible Warnings Description and Operation

Visual/Physical Inspection
- Inspect for aftermarket devices which could affect the operation of the Instrument Cluster or Audible Warning Systems.
- 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.

Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

Gages
- Engine Coolant Temperature Gage Inaccurate or Inoperative
- Engine Oil Pressure Gage Inaccurate or Inoperative
- Fuel Gage Inaccurate or Inoperative
- Speedometer and/or Odometer Inaccurate or Inoperative (5.3L Engine) Speedometer and/or Odometer Inaccurate or Inoperative (4.2L Engine)
- Tachometer Inaccurate or Inoperative
- Volt Gage Inaccurate or Inoperative

Indicators
- Change Engine Oil Indicator Always On
- Low Fuel Indicator Inoperative
- Service Indicator Always On in Transfer Case - NVG 126-NP4
- Service Indicator Inoperative in Transfer Case - NVG 126-NP4
- Service Indicator Always On in Transfer Case - NVG 226-NP8
- Service Indicator Inoperative in Transfer Case - NVG 226-NP8
- Brake Warning Indicator Always On in Hydraulic Brakes
- Brake Warning Indicator Inoperative in Hydraulic Brakes
- ABS Indicator Always On in Antilock Brake System
- ABS Indicator Inoperative in Antilock Brake System
- Charge Indicator Always On in Starting and Charging
- Charge Indicator Inoperative in Starting and Charging
- Malfunction Indicator Lamp (MIL) Always On in Computers and Control Systems - 4.2L
- Malfunction Indicator Lamp (MIL) Inoperative in Computers and Control Systems - 4.2L
- Cell Link to Rear Hatch/Gate Ajar Indicator Malfunction in Trunk/Liftgate
- High Beam Indicator Always On in Lighting Systems
- High Beam Indicator Inoperative in Lighting Systems
- Turn Signal Lamps and/or Indicators Always On or Flashing in Lighting Systems
- Turn Signal Lamps and/or Indicators Inoperative in Lighting Systems
- Air Bag Indicator Circuit Malfunction in Restraint Systems
- Cruise Control Indicator Always On (5.3L) Cruise Control Indicator Always On (4.2L) in Cruise Control
- Cruise Control Indicator Inoperative (5.3L) Cruise Control Indicator Inoperative (4.2L) in Cruise Control
- Security Indicator Inoperative in Theft Deterrent

Driver Information Center
- Driver Information Center (DIC) Switch(es) Inoperative

Instrument Cluster Dimming
- Interior Backlighting Does Not Dim in Lighting Systems
- Interior Backlighting Inoperative in Lighting Systems

Odometer
- Odometer Trip/Reset Switch Inoperative

Audible Warning
- Chime Always On
- Chime Inoperative