GM Service Manual Online
For 1990-2009 cars only

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

  1. Before using the symptom diagnostic tables, perform the Diagnostic System Check - Vehicle in order to determine that there are no DTCs set, and that the control modules can communicate via the serial data link:
  2. Review the system operation in order to understand the system functions. Refer to the following description and operations:
  3. •  Instrument Cluster Description and Operation
    •  Indicator/Warning Message Description and Operation
    •  Driver Information Center (DIC) Description and Operation
    •  Audible Warnings Description and Operation

Visual/Physical Inspection

    â€¢ Inspect for aftermarket devices which can affect the operation of the instrument panel cluster or the audible warnings system. Refer to Checking Aftermarket Accessories .
    â€¢ Inspect the accessible system components or the visible system components for obvious damage or for obvious conditions which can cause the symptom.
    â€¢ 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 .

Symptom List

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

Gages and Odometer

    â€¢  Instrument Cluster Gages Inoperative
    â€¢  Fuel Gage Inaccurate or Inoperative

Indicators

    â€¢  ABS Indicator Always On
    â€¢  ABS Indicator Inoperative
    â€¢  Air Bag Indicator Circuit Malfunction
    â€¢  Brake Warning Indicator Always On
    â€¢  Brake Warning Indicator Inoperative
    â€¢  Change Engine Oil Indicator Always On
    â€¢  Charge Indicator Always On
    â€¢  Charge Indicator Inoperative
    â€¢  Door Ajar Indicator Malfunction
    â€¢  Engine Coolant Temperature Indicator Always On
    â€¢  Engine Oil Pressure Indicator Always On
    â€¢  Fog Lamp Indicator Always On
    â€¢  Fog Lamp Indicator Inoperative
    â€¢  Fog Lamps Always On
    â€¢  Fog Lamps Inoperative
    â€¢  Low Engine Oil Level Indicator Always On
    â€¢  Low Washer Fluid Indicator Malfunction
    â€¢  Malfunction Indicator Lamp (MIL) Diagnosis
    â€¢  Seat Belt Indicator Circuit Malfunction - Driver
    â€¢  Seat Belt Indicator Circuit Malfunction - Passenger
    â€¢  Security Indicator LED Inoperative
    â€¢  Stability System Disabled Indicator Always On
    â€¢  Turn Signal Lamps and/or Indicators Always On or Flashing
    â€¢  Turn Signal Lamps and/or Indicators Inoperative
    â€¢  Traction Off Indicator Always On
    â€¢  Traction Off Indicator Inoperative
    â€¢  Trunk Ajar Indicator Always On
    â€¢  Trunk Ajar Indicator Inoperative

Driver Information Center

    â€¢  Driver Information Center (DIC) Inoperative
    â€¢  Driver Information Center (DIC) Switch Inoperative

Audible Warnings

    â€¢  Chime Always On
    â€¢  Chime Inoperative