GM Service Manual Online
For 1990-2009 cars only

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

  1. Perform the Diagnostic System Check - Vehicle before using the Symptom Tables in order to verify that all of the following are true:
  2. • There are no DTCs set.
    • The control modules can communicate via the serial data link.
  3. Review the system operation in order to familiarize yourself with the system functions. Refer to the following:
  4. •  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 could affect the operation of the Instrument Cluster or Audible Warning Systems. Refer to Checking Aftermarket Accessories .
    â€¢ Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
    â€¢ Inspect for proper fluid level.

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 Inoperative
    â€¢  Engine Oil Pressure Gage Inaccurate or Inoperative
    â€¢  Fuel Gage Inaccurate or Inoperative
    â€¢  Instrument Cluster Gages Inoperative
    â€¢  Odometer Trip/Reset Switch Inoperative
    â€¢  Speedometer and/or Odometer Inaccurate or Inoperative
    â€¢  Tachometer Inaccurate or Inoperative
    â€¢  Volt Gage Inaccurate or Inoperative
    â€¢  Change Engine Oil Indicator Always On
    â€¢  Low Engine Oil Level Indicator Always On

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€¢  Cruise Control Indicator Always On
    â€¢  Cruise Control Indicator Inoperative
    â€¢  Engine Coolant Temperature Indicator Always On
    â€¢  Engine Overheated Indicator Always On
    â€¢  High Beam Indicator Always On
    â€¢  High Beam Indicator Inoperative
    â€¢  Low Engine Coolant Indicator Always On
    â€¢  Low Engine Oil Level Indicator Always On
    â€¢  Low Washer Fluid Indicator Malfunction
    â€¢  Malfunction Indicator Lamp (MIL) Inoperative for the 4.3L engine
    â€¢  Malfunction Indicator Lamp (MIL) Always On for the 4.3L engine
    â€¢  Malfunction Indicator Lamp (MIL) Inoperative for the 4.8L, 5.3L and 6.0L engine
    â€¢  Malfunction Indicator Lamp (MIL) Always On for the 4.8L, 5.3L and 6.0L engine
    â€¢  Malfunction Indicator Lamp (MIL) Diagnosis for the 6.6L engine
    â€¢  Security Indicator Always On or Flashing
    â€¢  Security Indicator Inoperative
    â€¢  Four-Wheel Drive Indicator Always On for the NVG 261 - NP2 transfer case
    â€¢  Four-Wheel Drive Indicator Inoperative for the NVG 261 - NP2 transfer case
    â€¢  Service Indicator Always On for the NVG 246 - NP8 transfer case
    â€¢  Service Indicator Inoperative for the NVG 246 - NP8 transfer case
    â€¢  Service Indicator Always On for the NVG 263 - NP1 transfer case
    â€¢  Service Indicator Inoperative for the NVG 263 - NP1 transfer case
    â€¢  Tow/Haul Switch/Indicator Always On or Inoperative for the 4L60-E transmission
    â€¢  Tow/Haul Switch/Indicator Always On or Inoperative for the 4L60-E transmission
    â€¢  Traction Off Indicator Always On
    â€¢  Traction Off Indicator Inoperative
    â€¢  Turn Signal Lamps and/or Indicators Always On or Flashing
    â€¢  Turn Signal Lamps and/or Indicators Inoperative
    â€¢  Water-in-Fuel Lamp Always On
    â€¢  Water-in-Fuel Lamp Inoperative

Instrument Cluster Dimming

    â€¢  Interior Backlighting Inoperative
    â€¢  Interior Backlighting Does Not Dim

Driver Information Center (DIC)

Driver Information Center (DIC) Switch Inoperative

Audible Warnings

    â€¢  Chime Always On
    â€¢  Chime Inoperative