GM Service Manual Online
For 1990-2009 cars only

Displays Test

Certain instrument panel cluster (IPC) features are tested when the ignition is turned on in order to verify the features are working properly. The following occurs at key up:

    • The ABS indicator illuminates briefly.
    • The BRAKE indicator illuminates.
    • The charge indicator illuminates.
    • The fasten safety belt indicator illuminates.
    • The LOW COOLANT indicator illuminates.
    • The LOW FUEL indicator illuminates.
    • The LOW OIL LEVEL indicator illuminates.
    • The oil pressure indicator illuminates.
    • The SECURITY indicator illuminates.
    • The SERVICE ENGINE SOON indicator (MIL) illuminates briefly.
    • The SRS AIR BAG indicator flashes 7 times.
    • The TEMP indicator illuminates.

Indicators and Warning Messages

Refer to Indicator/Warning Message Description and Operation .

Engine Coolant Temperature Gage

The IPC displays the engine coolant temperature as determined by the engine coolant temperature sensor (discrete input) indicating engine coolant temperature. The engine coolant temperature gage defaults to 160°F (75°C) or below if there is a malfunction in the engine coolant temperature sensor circuit.

Fuel Gage

The IPC displays the fuel level as determined by the PCM. The IPC receives a discrete input from the PCM indicating the fuel level percent. The fuel gage defaults to empty if the PCM detects a malfunction in the fuel level sensor circuit.

When the fuel level is less than a pre-determined value, the low fuel indicator illuminates.

Odometer

The IPC contains a season odometer and a trip odometer. Press the trip reset switch in order to reset the trip odometer. The IPC displays the vehicle mileage and trip mileage as determined by the IPC. The IPC calculates the mileage based on the vehicle speed signal circuit from the PCM.

PRNDL Display

The IPC displays the selected gear position as determined by the PCM. The IPC receives a discrete input from the PCM indicating the gear position.

Speedometer

The IPC displays the vehicle speed based on the information from the PCM. The PCM converts the data from the vehicle speed sensor to a 4000 pulses/mile signal. The IPC uses the vehicle speed signal circuit (4000 pulses/mile) from the PCM in order to calculate the vehicle speed. The speedometer defaults to 0 mph (0 km/h) if a malfunction in the vehicle speed signal circuit (4000 pulses/mile) exists.

Tachometer

The IPC displays the engine speed based on information from the PCM. The PCM converts the data from the engine speed sensor to a 2 pulses/engine revolution signal. The IPC uses the engine speed signal circuit (2 pulses/engine revolution) from the PCM in order to calculate the engine speed. The tachometer defaults to 0 rpm if a malfunction in the engine speed signal circuit (2 pulses/engine revolution) exists.