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

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 Symbol

ABS Indicator

Battery Symbol

Charging System Indicator(s)

BRAKE Symbol

Brake System Indicator(s)

Fasten Safety Belt Symbol

Fasten Safety Belt Indicator

High Beam Symbol

Lighting System Indicator(s)

LOW COOLANT

Engine Cooling Indicator(s)

Low Fuel Symbol

Fuel System Indicator(s)

LOW OIL LEVEL

Engine Oil Indicator(s)

Oil Pressure Symbol

Engine Oil Indicator(s)

SECURITY

Theft System Indicator(s)

SERVICE ENGINE SOON

Malfunction Indicator Lamp (MIL)

SRS AIR BAG

Air Bag Indicator(s)

TEMP

Engine Coolant Indicator(s)

Turn Signal symbols

Lighting System Indicator(s)

DIC Indicators

Vehicle Indicator Name

Indicator Description Title

BOOST

Shift Indicator(s)

CHANGE OIL SOON

Engine Oil Indicator(s)

Door Ajar Symbol

Door Ajar Indicator(s)

LOW TRAC

Traction System Indicator(s)

Low Washer Fluid Symbol

Washer System Indicator(s)

PERFORMANCE SHIFT

Shift Indicator(s)

TCS OFF

Traction System Indicator(s)

TRAC OFF

Traction System Indicator(s)

Trunk Ajar Symbol

Trunk Ajar 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 discrete input from the EBCM requesting illumination.
    • The IPC performs the displays test at the start of each ignition cycle. The IPC illuminates the ABS indicator.

Air Bag Indicator

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

    • The IPC detects a malfunction with the supplemental inflatable restraint system. The IPC receives a discrete input from the SDM requesting illumination.
    • The IPC performs the displays test at the start of each ignition cycle. The IPC illuminates the air bag indicator.

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.

Charging System Indicator

The instrument panel cluster (IPC) illuminates the charge indicator when the following occurs:

    • The powertrain control module (PCM) detects that the generator output is less than 11 volts or greater than 16 volts. The IPC receives a discrete input from the PCM requesting illumination.
    • The IPC performs the displays test at the start of each ignition cycle. The IPC illuminates the charge indicator.
    • The ignition is on, with the engine off.

Door Ajar Indicator

The DIC illuminates the door ajar indicator when any of the four vehicle doors is open. The DIC receives a discrete input from the corresponding door ajar switch requesting illumination. When this indicator is on the BCM activates the audible warning.

Engine Coolant Indicator(s)

TEMP

    • The IPC illuminates the TEMP indicator when the PCM determines that the coolant temperature is greater than 128°C (262°F). The IPC receives a discrete input from the PCM requesting illumination.
    • The IPC performs the displays test at the start of each ignition cycle. The IPC illuminates the TEMP indicator.

Engine Oil Indicator(s)

CHANGE OIL SOON

The DIC illuminates the CHANGE OIL SOON indicator when the PCM determines that the engine oil should be changed. The DIC receives a discrete input from the PCM requesting illumination. When this indicator is on the BCM activates the audible warning. Once the oil is changed, perform the engine oil monitor reset procedure in order to clear the CHANGE OIL SOON indicator. Refer to GM Oil Life System Resetting in Maintenance and Lubrication.

LOW OIL LEVEL

    • The IPC illuminates the LOW OIL LEVEL indicator when the PCM detects a low engine oil level condition. The IPC receives a discrete input from the PCM requesting illumination.
    • The IPC performs the displays test at the start of each ignition cycle. The IPC illuminates the LOW OIL LEVEL indicator.

LOW OIL PRESSURE

    • The IPC illuminates the low oil pressure indicator when the engine oil pressure switch detects low oil pressure. The IPC receives a discrete input from the engine oil pressure switch requesting illumination.
    • The IPC performs the displays test at the start of each ignition cycle. The IPC illuminates the low oil pressure indicator.

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

    • The IPC illuminates the low fuel indicator when the fuel level is less than a pre-determined value. The IPC receives a discrete input from the PCM indicating the fuel level percent. 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 low fuel indicator.

Lighting System Indicator(s)

High Beam

The IPC illuminates the high beam indicator when the high beams are on or the flash to pass feature is activated. The IPC receives a discrete input from the headlamp dimmer switch requesting illumination.

Turn Signals

The IPC illuminates the right or left turn signal indicator when a turn signal or a hazard request is received. The IPC receives a discrete input from the turn signal switch requesting illumination. If the BCM determines that the turn signal is active for more than 1.2 km (0.75 mi), the BCM activates the 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.

SHIFT Indicator(s)

BOOST

If the vehicle has a 3.8L V6 supercharged engine the DIC will display the amount of boost the engine is receiving from the PCM (UART serial data line).

PERFORMANCE SHIFT

If the vehicle has a 3.8L V6 supercharged engine the DIC will display the PERFORMANCE SHIFT indicator when the performance shift button is pressed on the console shift lever. When this indicator is on the vehicle is in the performance shifting mode.

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 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 top of 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

The DIC illuminates the LOW TRAC indicator when the electronic brake control module (EBCM) detects a malfunction in the traction control system. The IPC receives a discrete input from the EBCM requesting illumination.

TCS OFF or TRAC OFF

The DIC illuminates the TCS OFF (3.8L V6 supercharged engine) or TRAC OFF (3.1L or 3.8L V6 engine) indicator when the electronic brake control module (EBCM) inhibits the traction control system. The IPC receives a discrete input from the EBCM requesting illumination.

Trunk Ajar Indicator

The DIC illuminates the trunk ajar indicator when the trunk is ajar or open. The IPC receives a discrete input from the rear compartment courtesy lamp switch requesting illumination. When this indicator is on the BCM activates the audible warning.

Washer Fluid Indicator

    • The DIC illuminates the low washer fluid indicator when a low washer fluid condition exists. The IPC receives a discrete input from the windshield washer solvent level switch requesting illumination. The low washer fluid indicator illuminates for 60 seconds when the condition is present. 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 low washer fluid indicator.