GM Service Manual Online
For 1990-2009 cars only

Note: 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

    • Inspect for aftermarket devices which can affect the operation of the instrument panel cluster or the audible warning systems. Refer to Checking Aftermarket Accessories.
    • Inspect the accessible system components or the visible system components for obvious damage or for obvious conditions which can 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.

Symptom List

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

Gages and Odometer

    •  Instrument Cluster Gages Inoperative
    •  Fuel Gage Inaccurate or Inoperative
    •  Odometer Trip/Reset Switch Inoperative

Indicators

    •  ABS Indicator Malfunction
    •  Adaptive Forward Lighting Malfunction
    •  Air Bag Indicator Circuit Malfunction
    •  Brake Warning Indicator Malfunction
    •  Charge Indicator Malfunction
    •  Cruise Control Indicator Malfunction
    •  Door Ajar Indicator Malfunction
    •  Engine Oil Pressure Indicator Malfunction
    •  Front Fog Lamps Malfunction
    •  Headlamps Malfunction
    •  Lights On Indicator Malfunction
    •  Low Tire Pressure Indicator Malfunction
    • Link x Malfunction Indicator Lamp (MIL) Diagnosis for LTD
    • Link x Malfunction Indicator Lamp (MIL) Diagnosis for LE5
    •  Rain Sensor Malfunction
    •  Rear Fog Lamps Malfunction
    •  Seat Belt Indicator Circuit Malfunction - Driver
    •  Security Indicator Always On or Flashing
    •  Security Indicator Inoperative
    •  Security Indicator Malfunction
    •  Traction Control/Stability Control Indicator Malfunction
    •  Turn Signal Lamps and/or Indicators Malfunction
    •  Washer Malfunction

Driver Information Center

    •  Driver Information Center (DIC) Switch Malfunction
    •  Outside Air Temperature Display Inaccurate or Inoperative

Audible Warnings

Chime Malfunction