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 Coolant Temperature Gage Inaccurate or Inoperative
    â€¢  Fuel Gage Inaccurate or Inoperative
    â€¢  Hourmeter Inaccurate or Inoperative
    â€¢  Speedometer and/or Odometer Inaccurate or Inoperative
    â€¢  Tachometer Inaccurate or Inoperative
    â€¢  Volt Gage Inaccurate or Inoperative

Indicators

    â€¢  Change Engine Oil Indicator Always On
    â€¢  Door Ajar Indicator Malfunction
    â€¢  Engine Oil Pressure Indicator Always On
    â€¢  Low Engine Oil Level Indicator Always On
    â€¢  Mirror Compass Display Inoperative or Inaccurate
    â€¢  Mirrors - Temperature Display Inaccurate
    â€¢  Mirrors - Temperature Displays SC or OC
    â€¢  Liftgate/Liftgate Window Ajar Indicator Malfunction
    â€¢  Service Indicator Always On for the NVG 246-NP8 transfer case
    â€¢  Service Indicator Inoperative for the NVG 246-NP8 transfer case
    â€¢  Brake Warning Indicator Malfunction
    â€¢  ABS Indicator Always On
    â€¢  ABS Indicator Inoperative
    â€¢  Stability System Caution Indicator Always On
    â€¢  Stability System Caution Indicator Inoperative
    â€¢  Low Tire Pressure Indicator Always On
    â€¢  Low Tire Pressure Indicator Inoperative
    â€¢  Charge Indicator Always On
    â€¢  Charge Indicator Inoperative
    â€¢  Malfunction Indicator Lamp (MIL) Diagnosis for the 4.8L, 5.3L, 6.0L, and 6.2L engines
    â€¢  Tow/Haul Switch/Indicator Always On or Inoperative for the 4L80-E automatic transmission
    â€¢  Low Washer Fluid Indicator Malfunction
    â€¢  Fog Lamp Indicator Inoperative
    â€¢  Rear Fog Lamp Indicator Inoperative
    â€¢  Hood Ajar Indicator/Message Malfunction
    â€¢  High Beam Indicator Always On
    â€¢  High Beam Indicator Inoperative
    â€¢  Turn Signal Lamps and/or Indicators Always On or Flashing
    â€¢  Turn Signal Lamps and/or Indicators Inoperative
    â€¢  Air Bag Indicator Circuit Malfunction
    â€¢  Passenger Presence System Indicator Circuit Malfunction
    â€¢  Seat Belt Indicator Circuit Malfunction - Driver
    â€¢  Seat Belt Indicator Circuit Malfunction - Passenger
    â€¢  Security Indicator Malfunction

Instrument Cluster Dimming

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

Driver Information Center (DIC)

Driver Information Center (DIC) Switch Inoperative

Audible Warnings

    â€¢  Chime Always On
    â€¢  Chime Inoperative