GM Service Manual Online
For 1990-2009 cars only

Important: Review the system operation in order to familiarize yourself with the system functions.

Refer to the following:

    •  Audible Warnings Description and Operation
    •  Indicator/Warning Message Description and Operation
    •  Instrument Cluster Description and Operation

Visual/Physical Inspection

    • Inspect for aftermarket devices which could affect the operation of the Instrument Panel Cluster (IPC). Refer to Checking Aftermarket Accessories in Wiring Systems.
    • Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
    • Inspect for the proper fluid levels.

Intermittent

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

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
    •  Engine Oil Pressure Gage Inaccurate or Inoperative
    •  Fuel Gage Inaccurate or Inoperative
    •  Speedometer and/or Odometer Inaccurate or Inoperative
    •  Tachometer Inaccurate or Inoperative
    •  Volt Gage Inaccurate or Inoperative

IPC Indicators

    •  ABS Indicator Always On in Antilock Brake System
    •  ABS Indicator Inoperative in Antilock Brake System
    •  Air ABS Indicator Always On in Air Antilock Brake System
    •  Air ABS Indicator Inoperative in Air Antilock Brake System
    •  Air Suspension Dump Indicator Inoperative in Air Suspension
    •  Apply Park Brake Indicator Always On in Park Brake
    •  Apply Park Brake Indicator Inoperative in Park Brake
    •  Auxiliary Brake Warning Indicator Always On in Hydraulic Brakes
    •  Auxiliary Brake Warning Indicator Inoperative in Hydraulic Brakes
    •  Charge Indicator Always On in Engine Electrical
    •  Charge Indicator Inoperative in Engine Electrical
    •  Check Gages Indicator Always On
    •  Check Gages Indicator Inoperative
    •  Daytime Running Lamps (DRL) Indicator Inoperative in Lighting Systems
    •  Differential Lock Indicator Inoperative in Rear Axle Controls
    •  High Beam Indicator Inoperative in Lighting Systems
    •  Low Engine Coolant Indicator Always On in Engine Cooling
    •  Park Brake Indicator Always On in Park Brake
    •  Park Brake Indicator Inoperative in Park Brake
    •  Primary Brake Warning Indicator Always On in Air Brakes
    •  Primary Brake Warning Indicator Always On in Hydraulic Brakes
    •  Primary Brake Warning Indicator Inoperative in Air Brakes
    •  Primary Brake Warning Indicator Inoperative in Hydraulic Brakes
    •  Service Park Brake Indicator Always On in Park Brake
    •  Service Park Brake Indicator Inoperative in Park Brake
    •  Trailer ABS Indicator Always On in Air Antilock Brake System
    •  Trailer ABS Indicator Inoperative in Air Antilock Brake System
    •  Turn Signal Lamps and/or Indicators Always On or Flashing in Lighting Systems
    •  Turn Signal Lamps and/or Indicators Inoperative in Lighting Systems

Instrument Cluster Dimming

    •  Interior Backlighting Does Not Dim in Lighting Systems
    •  Interior Backlighting Inoperative in Lighting Systems