A Symptom Diagnosis

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

1. Perform Diagnostic System Check - Instrument Cluster, Diagnostic System Check - Instrument Panel Cluster Diagnostic System Check - Driver Information Systems, Diagnostic System Check - Driver Information Systems or Diagnostic System Check - Audible Warnings Diagnostic System Check - Audible Warnings 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.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to one of 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, Driver Information Center, 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.
^ Perform a visual inspection of the fluid level before beginning diagnosis.
^ 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 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 Odometer
^ Engine Coolant Temperature Gage Inaccurate or Inoperative
^ Fuel Gage Inaccurate or Inoperative
^ Odometer Trip/Reset Switch Inoperative
^ Speedometer and/or Odometer Inaccurate or Inoperative
^ Tachometer Inaccurate or Inoperative

Indicators
^ ABS Indicator Always On in Antilock Brake System. ABS Indicator Always On
^ ABS Indicator Inoperative in Antilock Brake System. ABS Indicator Inoperative
^ Air Bag Indicator Circuit Malfunction in Restraint Systems. Symptom Related Diagnostic Procedures
^ Brake Warning Indicator Always On in Hydraulic Brakes. Brake Warning Indicator Always On
^ Brake Warning Indicator Inoperative in Hydraulic Brakes. Symptom Related Diagnostic Procedures
^ Change Engine Oil Indicator Always On
^ Charge Indicator Always On in Starting and Charging. Charge Indicator Always On
^ Charge Indicator Inoperative in Starting and Charging. Charge Indicator Inoperative
^ Cruise Control Indicator Always On in Cruise Control. Testing and Inspection
^ Cruise Control Indicator Inoperative in Cruise Control. Testing and Inspection
^ Engine Oil Pressure Indicator Always On
^ Fog Lamp Indicator Always On - Rear in Lighting Systems. Testing and Inspection
^ Fog Lamp Indicator Inoperative - Rear in Lighting Systems. Testing and Inspection
^ High Beam Indicator Always On in Lighting Systems. Testing and Inspection
^ High Beam Indicator Inoperative in Lighting Systems. Testing and Inspection
^ Low Engine Oil Level Indicator Always On
^ Malfunction Indicator Lamp (MIL) Always On in Computers and Controls Systems 3.5 L. Malfunction Indicator Lamp (MIL) Always On
^ Malfunction Indicator Lamp (MIL) Inoperative in Computers and Controls Systems 3.5 L. Malfunction Indicator Lamp (MIL) Inoperative
^ Malfunction Indicator Lamp (MIL) Always On in Computers and Controls Systems 4.0 L. Malfunction Indicator Lamp (MIL) Always On
^ Malfunction Indicator Lamp (MIL) Inoperative in Computers and Controls Systems 4.0 L. Malfunction Indicator Lamp (MIL) Inoperative
^ Seat Belt Indicator Circuit Malfunction in Seat Belt. Symptom Related Diagnostic Procedures
^ Security Indicator Inoperative in Theft Deterrent. Testing and Inspection
^ Traction Active Indicator Always On in Antilock Brake System. Traction Active Indicator Always On
^ Traction Active Indicator Inoperative in Antilock Brake System. Symptom Related Diagnostic Procedures
^ Traction Off Indicator Always On (w/NW9) in Antilock Brake System. Traction Off Indicator Always On (W/NW9)
^ Traction Off Indicator Inoperative (w/NW9) in Antilock Brake System. Traction Off Indicator Inoperative (W/NW9)
^ 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

"For a description of the RPO Code(s) shown in this article or any of the images therein, refer to the RPO Code List found at Vehicle/Application". RPO Codes