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 for proper fluid level.

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 and Odometer
- Instrument Cluster Inoperative
- Instrument Cluster Inoperative
- Engine Oil Pressure Gage Inaccurate or Inoperative
- Fuel Gage Inaccurate or Inoperative (Dual Tanks) Fuel Gage Inaccurate or Inoperative (Single Tank)
- Instrument Panel Cluster (IPC) Gages Inoperative
- Odometer Trip/Reset Switch Inoperative
- Speedometer and/or Odometer Inaccurate or Inoperative
- Tachometer Inaccurate or Inoperative
- Volt Gage Inaccurate or Inoperative
- Change Engine Oil Indicator Always On
- Low Engine Oil Level Indicator Always On

Indicators
- Change Engine Oil Indicator Always On
- Low Engine Oil Level Indicator Always On
- Service Indicator Always On in Transfer Case - BW 4482-NR4
- Service Indicator Inoperative in Transfer Case - BW 4482-NR4
- Service Indicator Always On in Transfer Case - NVG 246-NP8
- Service Indicator Inoperative in Transfer Case - NVG 246-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
- Traction Off Indicator Always On in Antilock Brake System
- Traction Off Indicator Inoperative in Antilock Brake System
- Engine Overheated Indicator Always On in Cooling System
- Engine Coolant Temperature Indicator Always On in Cooling System
- Low Engine Coolant Indicator Always On in Cooling System
- Charge Indicator Always On in Starting and Charging
- Charge Indicator Inoperative in Starting and Charging
- Malfunction Indicator Lamp (MIL) Inoperative in Computers and Control Systems - 4.8L, 5.3L, and 6.0L
- Malfunction Indicator Lamp (MIL) Always On in Computers and Control Systems - 4.8L, 5.3L, and 6.0L
- Tow/Haul Switch/Indicator Always On or Inoperative in Automatic Transmission - 4L60-E
- Tow/Haul Switch/Indicator Always On or Inoperative in Automatic Transmission - 4L80-E
- Low Washer Fluid Indicator Malfunction in Wipers/Washer Systems
- 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 in Cruise Control
- Cruise Control Indicator Inoperative in Cruise Control
- Security Indicator Always On or Flashing in Theft Deterrent
- Security Indicator Inoperative in Theft Deterrent

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

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

Audible Warnings
- Chime Always On
- Chime Inoperative