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 will illuminate briefly or flash at key up:

    • The ABS indicator
    • The AIR BAG indicator
    • The BRAKE indicator
    • The CRUISE indicator
    • The charge indicator
    • The engine coolant indicator
    • The engine oil pressure indicator
    • The fasten belts indicator
    • The SECURITY indicator
    • The SERVICE ENGINE SOON indicator (MIL)

Indicators and Warning Messages

Refer to Indicator/Warning Message Description and Operation .

Average Fuel Economy (wU02)

The average fuel economy is a function of distance traveled divided by fuel used since the parameter was last reset. When the average fuel economy is displayed in the IPC, pressing the INFO RESET button on the DIC will reset the average fuel economy parameter. On vehicles equipped w/UY9, the average fuel economy parameter is only displayed on the DIC.

The average fuel economy displays either miles or kilometers as requested by briefly pressing the ENG/MET button on the driver information center (DIC).

Engine Coolant Temperature Gage

The IPC displays the engine coolant temperature as determined by the PCM. The IPC receives a class 2 message from the PCM indicating the engine coolant temperature. The engine coolant temperature gage defaults to C if:

    • The PCM detects a malfunction in the engine coolant temperature sensor circuit.
    • The IPC detects a loss of class 2 communications with the PCM.

Fuel Gage

The IPC displays the fuel level as determined by the PCM. The IPC receives a class 2 message 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 signal circuit.
    • The IPC detects a loss of class 2 communications with the PCM.

Fuel Range (w/U02)

The fuel range is the estimated distance that the vehicle can travel under the current fuel economy and fuel level conditions. The fuel range parameter cannot be reset by the driver. "LO" is displayed in the fuel range display when the range is calculated to be less than 64 km (40 miles). The fuel range displays either miles or kilometers as requested by briefly pressing the ENG/MET button on the driver information center (DIC).

Odometer

The IPC contains a season odometer and two trip odometers. The IPC calculates the mileage based on the vehicle speed signal circuit from the PCM. The odometer will display 'error' if an internal IPC memory failure is detected. The odometer displays either miles or kilometers as requested by briefly pressing the ENG/MET button on the driver information center (DIC). Pressing the RESET TRIP A/B button for greater than 2 seconds will reset the trip odometer that is displayed.

PRNDL Display

The IPC displays the selected gear position as determined by the PCM. The IPC receives a class 2 message from the PCM indicating the gear position. The PRNDL display blanks if:

    • The PCM detects a malfunction in the transmission range switch signal circuit.
    • The IPC receives a class 2 message indicating the park position and the column park switch indicates a position other than park.
    • The IPC detects a loss of class 2 communications with the PCM.

Speedometer

The IPC displays the vehicle speed based on the information received 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 from the PCM in order to calculate the vehicle speed. The speedometer defaults to 0 km/h (0 mph) if a malfunction in the vehicle speed signal circuit exists. The speedometer displays either miles or kilometers as requested by briefly pressing the ENG/MET button on the DIC.

On vehicles equipped w/UY9 the speedometer display configuration can be changed by using the DSPL MODE button. The speedometer can be configured in one of the following formats:

    • Analog display only
    • Analog and digital displays
    • Digital display only

Tachometer (w/UY9)

The IPC displays the engine speed based on information received from the PCM. The PCM converts the data from the engine to a 2 pulses per engine revolution signal. The IPC uses the engine speed signal circuit 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 exists.

Voltmeter

The IPC displays the system voltage as detected at the ignition 1 input of the IPC.