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)

BRAKE

Brake System Indicator(s)

CHANGE OIL

Engine Oil Indicator(s)

Charge Symbol

Charging System Indicator(s)

DOOR AJAR

Door Ajar Indicator(s)

Fasten Safety Belt Symbol

Fasten Safety Belt Indicator(s)

Fog Lamp Symbol

Lighting System Indicator(s)

HATCH AJAR

Hatch Ajar Indicator(s)

High Beam Symbol

Lighting System Indicator(s)

HOT COOLANT TEMP

Engine Coolant Indicator(s)

LOW FUEL

Fuel System Indicator(s)

LOW OIL LEVEL

Engine Oil Indicator(s)

LOW OIL PRESSURE

Engine Oil Indicator(s)

OVER SPEED

Vehicle Overspeed Indicator(s)

SECURITY

Theft System Indicator(s)

SERVICE ENGINE SOON

Malfunction Indicator Lamp (MIL)

SERVICE TRACTION SYSTEM

Traction Control System Indicator(s)

TRAC OFF

Traction Control System Indicator(s)

TRACTION ACTIVE

Traction Control System Indicator(s)

Trailer Towing Symbol

Lighting 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.

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.

Brake System Indicator

The IPC illuminates the brake indicator when the following occurs:

    • The IPC detects a low brake fluid condition. The IPC receives a discrete input from the brake fluid level switch requesting illumination.
    • The IPC detects the park brake is engaged. The IPC receives a discrete input from the park brake switch requesting illumination.
    • The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.

Charge Indicator

The IPC illuminates the charge indicator in the message center when the following occurs:

    • The PCM detects that the generator output is less than 11 volts or greater than 16 volts. 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 ignition is on, with the engine off.

Door Ajar Indicator

The IPC illuminates the door ajar indicator in the message center when the door ajar switch closes sending a low input to the IPC.

Engine Coolant Indicator(s)

Hot Coolant Temp

The IPC illuminates the hot coolant temp indicator in the message center when the IPC determines that the coolant temperature is greater than 128°C (262°F). The IPC receives a class 2 message from the PCM indicating the coolant temperature.

Engine Oil Indicator(s)

Change Oil Indicator

The IPC illuminates the change oil indicator in the message center when the PCM determines when the engine oil needs to be changed. The IPC receives a class 2 message from the PCM requesting illumination.

Low Oil Level Indicator

The IPC illuminates the low oil level indicator in the message center when the PCM receives low oil information from the engine oil level switch. The IPC receives a class 2 message from the PCM requesting illumination.

Low Oil Pressure Indicator

The IPC illuminates the low oil pressure indicator in the message center when the PCM detects low or failed engine oil pressure. The IPC receives a class 2 message from the PCM. The IPC also sends a message to the BCM to chime the audible warning continuosly when the condition exists.

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.

Fuel System Indicator(s)

Low Fuel Indicator

The PCM receives fuel level information from the fuel sensor. The IPC receives a class 2 message from the PCM indicating the fuel level information. The IPC uses the fuel data received from the PCM and a software program to determine the proper fuel level to display. If the fuel level is below 9.5% or E, the LOW FUEL message and Fuel Pump ISO illuminate (there is a 30 second delay before the light turns on) in the message center. The IPC also sends a message to the BCM to chime the audible warning 4 times when this condition exists.

Hatch Ajar Indicator

The IPC illuminates the hatch ajar indicator in the message center when the rear compartment lid ajar indicator switch closes which indicates that the hatch is open.

Lighting System Indicator(s)

Fog Lamp

The IPC illuminates the fog lamp indicator when the fog lamp switch sends a high output to the IPC.

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.

Trailer Towing

The IPC illuminates the trailer towing indicator when the trailer tow is connected and the left or the right turn signal is activated. The hazard lamp/turn signal flasher sends a high output to the instrument cluster.

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.

Theft System Indicator(s)

SECURITY

The IPC illuminates the SECURITY indicator in the message center as determined by the Vehicle Theft Deterrent (VTD) system. The IPC receives a class 2 message from the theft deterrent controller module 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)

Service Traction System

The IPC illuminates the service traction system indicator in the message center when the electronic brake control module (EBCM) detects a malfunction in the traction control system. The IPC receives a class 2 message from the EBCM requesting illumination.

Traction Active

The IPC illuminates the traction active indicator in the message center when the electronic brake control module (EBCM) detects a traction control event. The IPC receives a class 2 message from the EBCM requesting illumination.

Trac Off

The IPC illuminates the trac off indicator when the electronic brake control module (EBCM) inhibits the traction control system. The IPC receives a class 2 message from the EBCM requesting illumination.

Vehicle Overspeed Indicator(s)

Over Speed Indicator

When the vehicle speed reaches 120 km/h plus or minus 2 km/h the IPC illuminates the over speed indicator in the message center. When the vehicle speed is reduced to 115 km/h plus or minus 2 km/h this message turns off.