A Symptom Diagnosis

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

1. Perform A 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 module(s) can communicate via the serial data link.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to the following list:
^ Gauge Description
^ Indicator Description

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 Diagrams.
^ 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 levels before beginning the diagnosis.
^ Inspect the applicable reservoir for the proper fluid level related to the indicator.
^ 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 Diagrams.

SYMPTOMS LIST
Refer to a Symptom Diagnostic Procedure from the following list in order to diagnose the symptom:

GAUGES
^ Instrument Cluster Inoperative
^ Engine Coolant Temperature Gauge Inaccurate or Inoperative
^ Engine Oil Pressure Gauge Inaccurate or Inoperative
^ Fuel Gauge Inaccurate or Inoperative
^ Volt Gauge Inaccurate or Inoperative
^ Speedometer Inaccurate or Inoperative
^ Tachometer Inoperative
^ Tachometer Inaccurate

INDICATORS
^ ABS Indicator On or Inoperative. Refer to A Diagnostic System Check (310 ABS) or A Diagnostic System Check (325 ABS) in Antilock Brake System.
^ AIR BAG Indicator Always On or Inoperative. Refer to A Diagnostic System Check - SIR in Restraint Systems.
^ Brake Warning Indicator Always On or Inoperative. Refer to Hydraulic Brake Diagnostic System Check in Hydraulic Brakes.
^ SECURITY Indicator Always On or Inoperative. Refer to A Diagnostic System Check - Theft Deterrent in Antitheft and Alarm Systems.
^ SERVICE ENGINE SOON Indicator (MIL) Always On or Inoperative. Refer to A Powertrain On Board Diagnostic (OBD) System Check in Computers and Control Systems - 4.3L.
^ SERVICE ENGINE SOON Indicator Always On or Inoperative. Refer to A Powertrain On Board Diagnostic (OBD) System Check in Computers and Control Systems - 2.2L (L43).
^ SERVICE ENGINE SOON Indicator Always On or Inoperative. Refer to A Powertrain On Board Diagnostic (OBD) System Check in Computers and Control Systems - 2.2L.
^ Fasten Safety Belt Indicator/Chime Always On in Seat Belts
^ Fasten Safety Belt Indicator/Chime Inoperative in Seat Belts
^ High Beam Indicator Always On in Lighting and Horns.
^ High Beam Indicator Inoperative in Lighting and Horns.
^ Turn Signal Indicators Inoperative - Left in Lighting and Horns.
^ Turn Signal Indicator Always On - Left in Lighting and Horns.
^ Turn Signal Indicators Inoperative - Right in Lighting and Horns.
^ Turn Signal Indicator Always On - Right in Lighting and Horns.
^ BATTERY Indicator Always ON. Refer to Charge Indicator Always On in Starting and Charging.
^ BATTERY Indicator Inoperative. Refer to Charge Indicator Inoperative in Starting and Charging.
^ CHECK GAGES Indicator Always ON. Refer to A Diagnostic System Check - Instrument Cluster.
^ GATE AJAR Indicator Always ON. Refer to Gate Ajar Indicator Always On in Trunk/Liftgate.
^ GATE AJAR Indicator Inoperative. Refer to Gate Ajar Indicator Inoperative in Trunk/Liftgate.
^ SERVICE 4WD Indicator Always ON or Inoperative. Refer to A Diagnostic System Check in Transfer Case - NVG 136 (NP4)
^ SERVICE 4WD Indicator Always ON or Inoperative. Refer to A Diagnostic System Check in Transfer Case - NVG 236
^ SHIFT Indicator Always ON (Manual Transmission Only)
^ SHIFT Indicator Inoperative (Manual Transmission Only)
^ TOW/HAUL Indicator Always ON or Inoperative (Automatic Transmission Only). Refer to Tow/Haul Switch/Indicator Always On or Inoperative (4.3L) in Automatic Transmission.

INSTRUMENT CLUSTER DIMMING
^ Instrument Cluster Illumination Lamps Inoperative
^ Instrument Cluster Illumination Lamps Do Not Dim
^ Instrument Cluster Illumination Lamps Always On

ODOMETER
^ Odometer Does Not Switch Between Trip and Season
^ Odometer Inoperative

PRNDL DISPLAY
^ PRNDL Display Inaccurate or Inoperative
^ PRNDL Display Park Indicator Inoperative

For a description of the RPO Code(s) shown in this article refer to the RPO Code List found at Vehicle/Application ID Application and ID