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 Vehicle DTC Information in order to verify the following conditions:
  2. • There are not any DTCs set.
    • The control modules can communicate via the serial data link.
  3. Review the system operation in order to understand the system functions. Refer to the following description and operations:
  4. •  Instrument Cluster Description and Operation
    •  Indicator/Warning Message 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 warnings system. Refer to Checking Aftermarket Accessories in Wiring Systems.
    • 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 in Wiring Systems.

Symptom List

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

Gages and Odometer

    •  Instrument Cluster Inoperative
    •  Engine Oil Pressure Gage Inaccurate or Inoperative
    •  Fuel Gage Inaccurate or Inoperative
    •  Hourmeter Inaccurate or Inoperative
    •  Instrument Cluster Gages Inoperative
    •  Speedometer and/or Odometer Inaccurate or Inoperative
    •  Tachometer Inaccurate or Inoperative
    •  Transmission Fluid Temperature Gage Inaccurate or Inoperative

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 Bag Indicator Circuit Malfunction in SIR
    •  Air Low Traction Indicator Always On in Air Antilock Brake System
    •  Air Low Traction Indicator Inoperative in Air Antilock Brake System
    •  Air Traction Off Indicator Always On in Air Antilock Brake System
    •  Air Traction Off Indicator Inoperative in Air Antilock Brake System
    •  Brake Warning Indicator Always On in Hydraulic Brakes
    •  Brake Warning Indicator Inoperative in Hydraulic Brakes
    •  Change Engine Oil Indicator Always On
    •  Charge Indicator Always On in Engine Electrical
    •  Charge Indicator Inoperative in Engine Electrical
    • CHECK TRANS Indicator Malfunction in Automatic Transmission
    •  Daytime Running Lamps (DRL) Indicator Inoperative in Lighting Systems
    •  Differential Lock Indicator Inoperative in Rear Drive Axle - Locking / Limited Slip Rear Axle
    • EXHAUST BRAKE Indicator Malfunction in Engine Exhaust
    •  High Beam Indicator Inoperative in Lighting Systems
    • Low Air Indicator Always On in Air Brakes
    • Low Air Indicator Inoperative in Air Brakes
    •  Low Engine Oil Level Indicator Always On
    •  Low Engine Coolant Indicator Always On in Engine Cooling
    •  Low Traction Indicator Always On in Antilock Brake System
    •  Low Traction Indicator Inoperative in Antilock Brake System
    •  Low Washer Fluid Indicator Malfunction in Wipers/Washer Systems
    •  Malfunction Indicator Lamp (MIL) Always On in Engine Controls - 6.6 L
    •  Malfunction Indicator Lamp (MIL) Inoperative in Engine Controls - 6.6 L
    •  Malfunction Indicator Lamp (MIL) Always On in Engine Controls - 7.8 L
    •  Malfunction Indicator Lamp (MIL) Inoperative in Engine Controls - 7.8 L
    •  Service Brake Soon Indicator Always On in Hydraulic Brakes
    •  Service Brake Soon Indicator Inoperative in Hydraulic Brakes
    •  Traction Off Indicator Always On in Antilock Brake System
    •  Traction Off Indicator Inoperative in Antilock Brake System
    •  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 Inoperative in Lighting Systems
    •  Wait to Start Indicator Always On
    •  Wait to Start Indicator Inoperative
    •  Water-in-Fuel Lamp Always On
    •  Water-in-Fuel Lamp Inoperative

Audible Warnings

    •  Chime Always On
    •  Chime Inoperative