A Symptom Diagnosis

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

1. Perform the Diagnostic System Check - Instrument Cluster 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
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
^ 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. Refer to Checking Aftermarket Accessories in Diagnostic Aids.
^ 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 bulb check.

Intermittent
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent and Poor Connections in Diagnostic Aids.

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

Gages and PRNDL Display
^ Engine Coolant Temperature Gage Inaccurate or Inoperative
^ Engine Oil Pressure Gage Inaccurate or Inoperative
^ Fuel Gage Inaccurate or Inoperative (Gas) or Fuel Gage Inaccurate or Inoperative (Diesel)
^ Gages Inoperative - All
^ Range Selector Displays Incorrect Range in Transmission 4L60E Symptom Related Diagnostic Procedures
^ Range Selector Displays Incorrect Range (Gas) in Transmission 4L80E Symptom Related Diagnostic Procedures
^ Speedometer and/or Odometer Inaccurate or Inoperative (Diesel) or Speedometer and/or Odometer Inaccurate or Inoperative (Gas)
^ Volt Gage Inaccurate or Inoperative

Indicators
^ ABS Indicator Always On (Export) or ABS Indicator Always On (Domestic) in Antilock Brakes System A Symptoms - Antilock Brake System
^ ABS Indicator Inoperative in Antilock Brake System ABS Indicator Inoperative
^ Air Bag Indicator Always On in Restraint Systems AIR BAG Indicator Always On
^ Air Bag Indicator Does Not Come ON in Restraint Systems AIR BAG Indicator Does Not Come ON
^ Brake Warning Indicator Always On (W/O DRLs) or Brake Warning Indicator Always On (DRL Equipped) in Hydraulic Brakes Symptom Related Diagnostic Procedures
^ Brake Warning Indicator Inoperative (DRL Equipped) or Brake Warning Indicator Inoperative (Without DRLs) in Hydraulic Brakes Symptom Related Diagnostic Procedures
^ Charge Indicator Always On in Starting and Charging Charge Indicator Always On
^ Charge Indicator Inoperative in Starting and Charging Charge Indicator Inoperative
^ Fasten Safety Belt Indicator/Chime Always On in Seat Belts Fasten Safety Belt Indicator/Chime Always On
^ Fasten Safety Belt Indicator/Chime Inoperative in Seat Belts Fasten Safety Belt Indicator/Chime Inoperative
^ GHigh Beam Indicator Inoperative in Lighting Systems Testing and Inspection
^ Low Engine Coolant Indicator Always On in Cooling System Low Engine Coolant Indicator Always On
^ Malfunction Indicator Lamp (MIL) Always On in Computers and Controls Systems - 4.3L Malfunction Indicator Lamp (MIL) Always On
^ Malfunction Indicator Lamp (MIL) Inoperative in Computers and Controls Systems - 4.3L Malfunction Indicator Lamp (MIL) Inoperative
^ Malfunction Indicator Lamp (MIL) Always On in Computers and Controls Systems - 5.0L and 5.7L Malfunction Indicator Lamp (MIL) Always On
^ Malfunction Indicator Lamp (MIL) Inoperative in Computers and Controls Systems - 5.0L and 5.7L Malfunction Indicator Lamp (MIL) Inoperative
^ Security Indicator Always On or Flashing in Theft Deterrent Testing and Inspection
^ Security Indicator Inoperative in Theft Deterrent Testing and Inspection
^ Turn Signal Lamps and/or Indicators Always On or Flashing in Lighting Systems Testing and Inspection
^ Turn Signal Lamps and/or Indicators Inoperative in Lighting Systems Testing and Inspection
^ Water-in-Fuel Lamp Always On in Computers and Controls Systems 6.5L
^ Water-in-Fuel Lamp Inoperative in Computers and Controls Systems 6.5L

Instrument Cluster Dimming
^ Interior Backlighting Does Not Dim in Lighting Systems Testing and Inspection
^ Interior Backlighting Inoperative in Lighting Systems Testing and Inspection

Audible Warning
^ Chime Always On
^ Chime Inoperative