GM Service Manual Online
For 1990-2009 cars only

ABS Inop Indicator

The ABS Inop indicator is controlled by either of the following components:

    • The electronic brake control module (EBCM)
    • The instrument cluster

The EBCM sends a Class 2 message through circuit 1036 to the instrument cluster to turn on the ABS inop indicator when a problem with the ABS system has been detected. The ABS system may be disabled, but base brake performance will remain.

The instrument cluster turns on the ABS Inop indicator under the following conditions:

    • Class 2 communication has been lost between the instrument cluster and the EBCM.
    • The 3 second bulb test is occurring.

Air Bag Indicator

The air bag indicator is controlled by either of the following components:

    • The inflatable restraint sensing and diagnostic module (SDM)
    • The instrument cluster

The SDM sends a Class 2 message through circuit 1036 to the instrument cluster to turn on the indicator when a problem with the SIR system has been detected.

The instrument cluster turns on the air bag indicator under the following conditions:

    • Class 2 communication has been lost between the instrument cluster and the SDM.
    • The 3 second bulb test is occurring.

If the instrument cluster detects a fault in the air bag indicator, the cluster sets DTC B0670 and illuminates the Service Vehicle Soon indicator.

ASR Off Indicator (Chevrolet with Traction Control Only)

The ASR off indicator is controlled by either of the following components:

    • The electronic brake control module (EBCM)
    • The instrument cluster

The EBCM sends a Class 2 message through circuit 1036 to the instrument cluster to turn on the ASR off indicator. The EBCM turns on the indicator under any of the following conditions:

    • The traction control system is off.
    • The traction control system has failed.
    • Class 2 communication has been lost between the instrument cluster and the EBCM.
    • The 3 second bulb test is occurring.

Brake Warning Indicator

The brake warning indicator lights under any of the following conditions:

    • The master cylinder senses a low brake fluid level.
    • The park brake switch is closed (park brake is set).
    • The EBCM senses a base brake failure.
    • Class 2 communication has been lost between the instrument cluster and the EBCM.
    • The 3 second bulb test is occurring.

Change Oil Indicator

The change oil indicator is controlled by either of the following components:

    • The powertrain control module (PCM)
    • The instrument cluster

The PCM sends a Class 2 message through circuit 1036 to the instrument cluster to turn on the change oil indicator when the engine oil is due to be changed. After the Class 2 message is sent from the PCM, the instrument cluster turns on the change oil indicator for approximately 60 seconds when the ignition switch is turned to the RUN position. The indicator is turned on every following ignition cycle until it is reset.

Perform the following steps in order to reset the change oil indicator:

  1. Turn the ignition switch to the RUN position with the engine off.
  2. Press and hold the trip odometer reset button for approximately 12 seconds.

When the change oil reset is completed, the PCM will flash the indicator twice through the Class 2 data line (circuit 1036).

Under normal conditions, the instrument cluster turns on the change oil indicator for approximately 3 seconds at bulb test.

Check Gauges Indicator

The check gauges indicator turns on in order to draw the driver's attention to the instrument cluster gauges. The check gauges indicator turns on under any of the following conditions:

    • The engine coolant temperature exceeds 107.2°C (225°F).
    • The engine oil pressure is low.
    • The generator malfunctions.
    • The vehicle fuel level falls below approximately 1/16 tank.

The powertrain control module (PCM) sends a Class 2 message to turn on the check gauges indicator depending on the signals it receives from the following components:

    • The engine coolant temperature sensor
    • The generator
    • The fuel level sender

The instrument cluster turns on the check gauges indicator for approximately 3 seconds at bulb test.

Engine Coolant Temperature Gauge

The engine coolant temperature gauge is controlled by the powertrain control module (PCM). The PCM monitors the engine coolant temperature sensor and sends the Class 2 information to the instrument cluster through circuit 1036. The temperature gauge displays the coolant temperature based on the Class 2 information it receives from the PCM.

Fasten Belts Indicator

The fasten seat belt indicator is controlled by the body control module (BCM). The BCM monitors the driver seat belt switch. If the driver seat belt is not buckled, the BCM applies voltage to the instrument cluster through circuit 237 at terminal A13 in order to illuminate the indicator. The indicator remains illuminated for approximately 70 seconds. The indicator turns off immediately if the seatbelt is buckled.

If the driver seat belt is buckled when the ignition switch is turned to the RUN or START position, the fasten seat belt indicator does not illuminate.

Fuel Gauge

The fuel gauge is controlled by the powertrain control module (PCM). The PCM monitors the fuel level sensor and sends the Class 2 information to the instrument cluster through circuit 1036. The fuel gauge displays the fuel level based on the Class 2 information sent from the PCM.

When the fuel level sensor reads the fuel level at less than 1/16 full, the PCM sends a Class 2 message to the instrument cluster through circuit 1036 in order to turn on the check gauges indicator.

Hatch Ajar Indicator

The hatch ajar indicator receives battery voltage when the ignition switch is in the following positions:

    • RUN
    • BULB TEST
    • START

The hatch ajar indicator is controlled by the rear compartment lid ajar indicator switch. The rear compartment lid ajar indicator switch closes when the rear compartment lid is open or ajar. The indicator turns on when the switch closes and ground is applied to the hatch ajar indicator through circuit 737.

High Beam Indicator

The high beam indicator is controlled by the headlamp dimmer switch. The high beam indicator turns on under the following conditions:

    • The headlamps are on.
    • The headlamp dimmer switch is in the high beam position.

Voltage is applied to the instrument cluster at terminal A17 through circuit 11 to turn on the indicator.

Low Oil Indicator

The low oil indicator is controlled by either of the following components:

    • The powertrain control module (PCM)
    • The instrument cluster

The PCM receives oil level information from the engine oil level switch. When a low engine oil condition exists, the PCM sends a Class 2 message through circuit 1036 to the instrument cluster in order to turn on the low oil indicator.

The instrument cluster turns the low oil indicator on for approximately 3 seconds at bulb test.

Trac Indicator

The trac indicator is controlled by either of the following components:

    • The electronic brake control module (EBCM)
    • The instrument cluster

The EBCM sends a Class 2 message through circuit 1036 to the instrument cluster in order to turn on the trac indicator. The EBCM turns on the indicator under one of the following conditions:

    • The anti-lock brake system is active.
    • The traction control system is active.
    • The 3 second bulb test is occurring.

Oil Pressure Gauge

The oil pressure gauge receives battery voltage through circuit 1035 when the ignition switch is in the following positions:

    • RUN
    • BULB TEST
    • START

The oil pressure gauge is controlled by the engine oil pressure sensor. The resistance of the engine oil pressure sensor varies with the engine oil pressure. The voltage drop across the oil pressure gauge varies due to the changing resistance in the gauge ground circuit. The oil pressure gauge reading changes with the voltage drop.

Reduced Engine Power Indicator (V6 VIN K Only)

The reduced engine power indicator is controlled by the following components:

    • The powertrain control module (PCM)
    • The instrument cluster

The PCM sends a Class 2 message through circuit 1036 to the instrument cluster in order to turn on the indicator when problems with the engine have been detected.

The instrument cluster turns on the reduced engine power indicator under the following conditions:

    • Class 2 communication has been lost between the instrument cluster and the PCM.
    • The 3 second bulb test is occurring.

Security Indicator

The security indicator is controlled by the body control module (BCM). The BCM monitors the ignition key resistor pellet. If the resistor pellet is incorrect, the BCM applies ground to the instrument cluster through circuit 728 at terminal B3 in order to illuminate the indicator. For a complete understanding of the security indicator operation, refer to the Vehicle Theft Deterrent (VTD) Operation .

The BCM turns on the security indicator for approximately 5 seconds at bulb test.

Skip Shift Indicator (V8 VIN G Manual Transmission Only)

The skip shift indicator is controlled by the following components:

    • The powertrain control module (PCM)
    • The instrument cluster

The PCM sends a Class 2 message through circuit 1036 to the instrument cluster in order to turn on the indicator when the transmission skip shift function is enabled.

The instrument cluster turns on the skip shift indicator for approximately 3 seconds at bulb test.

Service Engine Soon Indicator

The powertrain control module (PCM) controls the service engine soon indicator.

Service Vehicle Indicator

The service vehicle indicator is controlled by the following components:

    • The powertrain control module (PCM)
    • The instrument cluster

The PCM sends a Class 2 message through circuit 1036 to the instrument cluster in order to turn on the indicator when problems with the engine have been detected.

The instrument cluster turns on the service soon indicator under the following conditions:

    • Class 2 communication has been lost between the instrument cluster and any other module (PCM, SDM, EBCM).
    • The air bag indicator is defective. DTC B0670 is set.
    • The 3 second bulb test is occurring.

Speedometer and Odometer

The vehicle speed sensor (VSS) is a gear driven permanent magnet generator housed in the transaxle. The sensor generates a sine wave output with a frequency proportional to the vehicle speed. The powertrain control module (PCM) converts the signal to an output that switches to ground at a frequency of 4000 pulses per mile. The signal (circuit 389) drives the speedometer and the odometer.

Tachometer

The tachometer is controlled by the powertrain control module (PCM). The PCM monitors the engine RPMs and sends the Class 2 information to the instrument cluster through circuit 1036. The tachometer displays the engine RPMs based on the Class 2 information sent from the PCM.

TCS Off Indicator (Pontiac with traction control only)

The TCS off indicator is controlled by either of the following components:

    • The electronic brake control module (EBCM)
    • The instrument cluster

The EBCM sends a Class 2 message through circuit 1036 to the instrument cluster to turn on the TCS off indicator. The EBCM turns on the indicator under any of the following conditions:

    • The traction control system is off.
    • The traction control system has failed.
    • Class 2 communication has been lost between the instrument cluster and the EBCM.
    • The 3 second bulb test is occurring.

The instrument cluster turns the TCS indicator on for approximately 3 seconds at bulb test.

Turn Signal Indicators

The turn signal switch is used to control the turn signal lamps. Voltage is sent to the instrument cluster in order to turn on the turn signal indicators. If the emergency flashers are turned on, both of the turn signal indicators will flash.