GM Service Manual Online
For 1990-2009 cars only

The indicator description and operation uses generic indicator names. Refer to the table below for the indicators that are available on this vehicle:

IPC Indicators

Vehicle Indicator Name

Indicator Description Title

ABS

ABS Indicator(s)

Air Bag Symbol

Air Bag Indicator(s)

ASR OFF

Traction Control System Indicator(s)

BRAKE

Brake System Indicator(s)

CHANGE OIL

Engine Oil Indicator(s)

CHECK GAGES

Check Gages Indicator(s)

Fasten Safety Belt Symbol

Fasten Safety Belt Indicator(s)

HATCH AJAR

Hatch Ajar Indicator(s)

High Beam Symbol

Lighting System Indicator(s)

LOW OIL LEVEL

Engine Oil Indicator(s)

LOW TRAC

Traction Control System Indicator(s)

REDUCED ENGINE POWER

Reduced Engine Power Indicator(s)

SECURITY

Theft System Indicator(s)

SERVICE ENGINE SOON

Malfunction Indicator Lamp (MIL)

SERVICE VEHICLE SOON

Electrical System Indicator(s)

SKIP SHIFT

Transmission System Indicator(s)

TCS OFF

Traction Control System Indicator(s)

Turn Signal Symbols

Lighting System Indicator(s)

ABS Indicator

The IPC illuminates the ABS indicator when the following occurs:

    • The electronic brake control module (EBCM) detects a malfunction with the antilock brake system. The IPC receives a class 2 message from the EBCM requesting illumination.
    • The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.
    • The IPC detects a loss of class 2 communications with the EBCM.

Air Bag Indicator

The IPC illuminates the air bag indicator when the following occurs:

    • The inflatable restraint sensing and diagnostic module (SDM) detects a malfunction with the supplemental inflatable restraint system. The IPC receives a class 2 message from the SDM requesting illumination.
    • The IPC performs the displays test at the start of each ignition cycle. The IPC flashes the air bag indicator 7 times.
    • The IPC detects a loss of class 2 communications with the SDM.

Brake System Indicator(s)

Brake Warning Indicator

The IPC illuminates the BRAKE indicator when the following occurs:

    • The PC detects that the park brake switch is closed (park brake set).
    • The IPC detects a low brake fluid condition.
    • The IPC performs the displays test at the start of each ignition cycle.
    • The EBCM senses a base brake failure.
    • The IPC detects a loss of class 2 communications with the EBCM.

Check Gages Indicator

The CHECK GAGES indicator illuminates under the following conditions:

    • Engine coolant temperature exceeds 107°C (225°F).
    • The engine oil pressure is low.
    • A generator malfunction exists.
    • The fuel level falls below 1/16 of a tank.
    • The IPC performs the displays test at the start of each ignition cycle.

The PCM sends a class 2 message in order to turn on the CHECK GAGES indicator depending on the signals it receives from the following components:

    • Engine coolant temperature sensor
    • Generator
    • Fuel level sensor

Electrical System Indicator(s)

Service Vehicle Soon Indicator

The IPC illuminates the service vehicle soon indicator in the message center when the following occurs:

    • DTC B0670 sets in the SDM module.
    • The PCM detects certain non-emissions related malfunctions. The IPC receives a class 2 message from the PCM requesting illumination.
    • The IPC performs the displays test at the start of each ignition cycle.
    • The IPC detects a loss of class 2 communications with any other module.

Engine Oil Indicator(s)

Change Oil

The IPC illuminates the change oil indicator when the following occurs:

    • The PCM determines when the engine oil needs to be changed. The IPC receives a class 2 message from the PCM requesting illumination. When the ignition is turned to RUN the indicator turns on for approximately 60 seconds. The indicator is turned on every following ignition cycle until the indicator is reset. To reset the indicator:
       - Turn the ignition to RUN.
       - Press and hold the trip odometer reset button for approximately 12 seconds. When completed the indicator will flash 2 times.
    • The IPC performs the displays test at the start of each ignition cycle.

Low Oil Level

The IPC illuminates the low oil level indicator when the following occurs:

    • The PCM detects a low oil level condition. The PCM monitors the engine oil level signal circuit. The IPC receives a class 2 message from the PCM requesting illumination.
    • The IPC performs the displays test at the start of each ignition cycle.

Fasten Safety Belt Indicator

    • The IPC illuminates the fasten safety belt indicator when the body control module (BCM) detects that the driver's seat belt is unbuckled. The IPC receives a discrete input from the BCM requesting illumination. When this indicator is on the BCM activates the audible warning.
    • The IPC performs the displays test at the start of each ignition cycle. The IPC illuminates the fasten safety belt indicator.

Hatch Ajar Indicator

The IPC illuminates the rear hatch ajar indicator when:

    •  The IPC detects that the rear compartment lid ajar indicator switch closes (hatch is open).
    • The IPC performs the displays test at the start of each ignition cycle.

Lighting System Indicators

High Beam

The IPC illuminates the high beam indicator when the headlamps are on and the headlamp dimmer switch is in the high beam position.

Turn Signals

The IPC illuminates the right or left turn signal indicator when the IPC detects a turn signal request or a hazard request.

Malfunction Indicator Lamp (MIL)

The PCM illuminates the MIL (service engine soon or check engine) when the following occurs:

    • The PCM detects a malfunction in the emissions system.
    • The PCM performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.
    • The ignition is on, with the engine off.

Reduced Engine Power Indicator (V6 VIN K)

The IPC illuminates the reduced engine power indicator when the following occurs:

    • The PCM detects a malfunction in the engine. The IPC receives a class 2 message from the PCM requesting illumination.
    • The IPC performs the displays test at the start of each ignition cycle.
    • The IPC detects a loss of class 2 communications with the PCM.

Theft System Indicator(s)

SECURITY

The IPC illuminates the SECURITY indicator as determined by the Vehicle Theft Deterrent (VTD) system. The IPC receives a discrete input from the BCM requesting illumination.

    • The VTD system requests the IPC to illuminate the indicator only when the ignition switch is ON. The VTD system uses the indicator as a malfunction indicator.
    • The Content Theft Deterrent (CTD) system uses the theft LED and does not use the SECURITY indicator.

Theft LED

The Body Control Module (BCM) illuminates the theft LED (on the dash) based on the current Content Theft Deterrent (CTD) system operation mode. The theft LED operates in the following modes:

    • ON
    • OFF
    • Flashing slow
    • Flashing fast

Traction Control System Indicator(s)

Low Trac Indicator

The IPC illuminates the Low Trac indicator when the following occurs:

    • The electronic brake control module (EBCM) detects a traction control event (either ABS active or traction control system active). The IPC receives a class 2 message from the EBCM requesting illumination.
    • The IPC performs the displays test at the start of each ignition cycle.

TCS Off Indicator (Pontiac) or ASR Off Indicator (Chevrolet)

The IPC illuminates the indicator when the following occurs:

    • The electronic brake control module (EBCM) inhibits the traction control system. The IPC receives a class 2 message from the EBCM requesting illumination.
    • The TCS is off.
    • The TCS has failed.
    • The IPC detects a loss of class 2 communications with the EBCM.

Transmission System Indicator(s)

Skip Shift Indicator (V8 VIN G, Manual Trans Only)

The IPC illuminates the skip shift indicator when the following occurs:

    • The powertrain control module (PCM) detects the transmission skip shift function is enabled. The IPC receives a class 2 message from the PCM requesting illumination.
    • The IPC performs the displays test at the start of each ignition cycle.