GM Service Manual Online
For 1990-2009 cars only
Table 1: IPC Indicators
Table 2: Message Center Indicators

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

IPC Indicators

Vehicle Indicator Name

Indicator Description Title

ABS symbol

ABS Indicator

Air Bag symbol

Air Bag Indicator

Brake symbol (Canada)

Brake System Indicator(s)

BRAKE (U.S.)

Brake System Indicator(s)

Check Engine symbol

Malfunction Indicator Lamp (MIL)

CRUISE

Cruise Control Indicator

Saftey Belt Reminder symbol

Fasten Safety Belt Indicator

High Beam symbol

Lighting System Indicator(s)

TRAC OFF

Traction Control System Indicator(s)

Turn Signal symbols

Lighting System Indicator(s)

Message Center Indicators

Vehicle Indicator Name

Indicator Description Title

Battery symbol

Charging System Indicator(s)

CHANGE ENGINE OIL

Engine Oil Indicator(s)

HIGHBEAM OUT

Lighting System Indicator(s)

LOW COOLANT LEVEL

Engine Coolant Indicator(s)

LOW FUEL symbol

Fuel System Indicator(s)

LOW ENG OIL LEVEL

Engine Oil Indicator(s)

LOW TIRE PRESSURE

Tire Pressure Indicator(s)

LOW WASHER FLUID

Washer Fluid Indicator

DOOR AJAR

Door Ajar Indicator(s)

HOT COOLANT TEMP

Engine Coolant Indicator(s)

LOW OIL PRESSURE

Engine Oil Indicator(s)

SECURITY

Theft System Indicator(s)

SERVICE TRACTION SYSTEM

Traction Control System Indicator(s)

SERVICE VEHICLE SOON

Electrical System Indicator(s)

TRACTION ACTIVE

Traction Control System Indicator(s)

TRUNK OPEN

Trunk Ajar Indicator

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

The IPC illuminates the brake indicator when the following occurs:

    • The body control module (BCM) detects that the park brake is engaged. The IPC receives a class 2 message from the BCM requesting illumination. If the vehicle is shifted out of park with the park brake engaged, the BCM sends a class 2 message to the radio in order to activate an audible warning.
    • The IPC detects a low brake fluid condition (signal circuit is low).
    • The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.

Charging System 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 determines that the system voltage is less than 11 volts or greater than 16 volts. The IPC receives a class 2 message from the body control module (BCM) indicating the system voltage.
    • The IPC 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.

Cruise Control Indicator

The IPC illuminates the CRUISE indicator when the PCM detects that the cruise control is requested. The IPC receives a class 2 message from the PCM requesting illumination.

Door Ajar Indicator

The IPC illuminates the DOOR AJAR indicator in the message center when the body control module (BCM) detects that the driver or passenger door is open. The IPC receives a class 2 message from the BCM requesting illumination. If the vehicle is in a forward or reverse gear position, the BCM sends a class 2 message to the radio in order to activate an audible warning.

Electrical System Indicator

The IPC illuminates the SERVICE VEHICLE SOON indicator in the message center when the following occurs:

    • The body control module (BCM) detects certain malfunctions in the lighting system or the horn system. The IPC receives a class 2 message from the BCM requesting illumination.
    • The PCM detects certain non-emissions related malfunctions. The IPC receives a class 2 message from the PCM requesting illumination.

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 121°C (250°F). The IPC receives a class 2 message from the PCM indicating the coolant temperature. The IPC sends a class 2 message to the radio in order to activate an audible warning.

LOW COOLANT LEVEL

The IPC illuminates the LOW COOLANT LEVEL indicator in the message center when the IPC detects a low coolant level condition (signal circuit is low). The IPC sends a class 2 message to the radio in order to activate an audible warning.

Engine Oil Indicator(s)

CHANGE ENGINE OIL

The IPC illuminates the CHANGE ENGINE OIL indicator in the message center when the PCM determines that the engine oil should be changed. The IPC receives a class 2 message from the PCM requesting illumination. Once the oil is changed, perform the engine oil monitor reset procedure in order to clear the CHANGE ENGINE OIL indicator. Refer to GM Oil Life System Resetting in Maintenance and Lubrication.

LOW ENG OIL LEVEL

The IPC illuminates the LOW ENG OIL LEVEL indicator in the message center when the PCM detects a low engine oil level condition (signal circuit is high). The IPC receives a class 2 message from the PCM requesting illumination. The LOW ENG OIL LEVEL indicator illuminates for 60 seconds at the start of each ignition cycle when the condition is present. The IPC sends a class 2 message to the radio in order to activate an audible warning.

LOW OIL PRESSURE

The IPC illuminates the LOW OIL PRESSURE indicator in the message center when the PCM detects low oil pressure (signal circuit is high). The IPC receives a class 2 message from the PCM requesting illumination. The IPC sends a class 2 message to the radio in order to activate an audible warning.

Fasten Safety Belt Indicator

The IPC illuminates the fasten safety belt indicator when the following occurs:

    • The inflatable restraint sensing and diagnostic module (SDM) detects that the driver's seat belt is unbuckled. The IPC receives a class 2 message from the SDM requesting illumination. The IPC illuminates the indicator for 20 seconds and then flashes the indicator for 55 seconds. The IPC also sends a class 2 message to the radio in order to activate the audible warning.
    • 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 SDM.

Fuel System Indicator

The IPC illuminates the LOW FUEL indicator in the message center when the IPC detects that the fuel level is less than a pre-determined value. The IPC receives a class 2 message from the PCM indicating the fuel level percent. The IPC sends a class 2 message to the radio in order to activate an audible warning.

Lighting System Indicator(s)

High Beam

The IPC illuminates the high beam indicator when the body control module (BCM) detects that the high beams are requested. The IPC receives a class 2 message from the BCM requesting illumination.

HIGHBEAM OUT

The IPC illuminates the HIGHBEAM OUT indicator in the message center when the body control module (BCM) detects an open in one of the highbeam lamp circuits. The IPC receives a class 2 message from the BCM requesting illumination. The HIGHBEAM OUT indicator illuminates for 60 seconds when the condition is present.

Turn Signals

The IPC illuminates the right or left turn signal indicator when the IPC detects a turn signal request or a hazard request. If the IPC determines that the turn signal is active for more than 1.2 km (0.75 mi), the IPC sends a class  2 message to the radio in order to activate an audible warning.

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

The IPC illuminates the SECURITY indicator in the message center as determined by the vehicle theft deterrent (VTD) system and the content theft deterrent (CTD) system. The IPC receives a class 2 message from the body control module (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 CTD system requests the IPC to illuminate the indicator only when the ignition switch is OFF. The CTD system uses the indicator in order to identify system status.

Tire Pressure Indicator

The IPC illuminates the LOW TIRE PRESSURE indicator in the message center when the electronic brake control module (EBCM) detects low pressure in any of the four tires. The IPC receives a class 2 message from the EBCM requesting illumination. The IPC sends a class 2 message to the radio in order to activate an audible warning.

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. The SERVICE TRACTION SYSTEM indicator illuminates for 60 seconds when the condition is present. The IPC sends a class 2 message to the radio in order to activate an audible warning.

TRAC OFF

The IPC illuminates the TRAC OFF indicator when the following occurs:

    • The electronic brake control module (EBCM) inhibits the traction control system due to a malfunction in the traction control system. The IPC receives a class 2 message from the EBCM requesting illumination.
    • The body control module (BCM) detects that the traction control switch has been pressed (signal circuit is low). The BCM sends a class 2 message to the EBCM in order to disable traction control. The IPC receives a class 2 message from the EBCM requesting illumination. The BCM sends a class 2 message to the radio in order to activate an audible warning.

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.

Trunk Ajar Indicator

The IPC illuminates the TRUNK OPEN indicator in the message center when the body control module (BCM) detects that the trunk is ajar or open (signal circuit is low). The IPC receives a class 2 message from the BCM requesting illumination. If the vehicle is in a forward or reverse gear position, the BCM sends a class 2 message to the radio in order to activate an audible warning.

Washer Fluid Indicator

The IPC illuminates the LOW WASHER FLUID indicator in the message center when the IPC detects a low washer fluid condition (signal circuit is low). The LOW WASHER FLUID indicator illuminates for 60 seconds when the condition is present.