Instrument Cluster / Carrier: Description and Operation

Instrument Cluster Description and Operation

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 air bag indicator flashes 7 times (not IPC controlled).
* The ABS indicator illuminates briefly.
* The battery Indicator illuminates briefly.
* The brake indicator illuminates briefly.
* The coolant temperature indicator.
* The engine oil pressure indicator illuminates briefly.
* The malfunction indicator lamp (MIL) illuminates briefly (not IPC controlled).
* The seat belt indicator illuminates for 70 secondsor until the driver seat belt is latched (not IPC controlled).
* The security indicator illuminates briefly.
* The tire pressure low indicator
* The vehicle dynamics caution (VDC) indicator
* All message center segments illuminate briefly.

Indicators and Warning Messages

Refer to Indicator/Warning Message Description and Operation.

Engine Coolant Temperature Gage

The instrument panel cluster (IPC) displays the engine coolant temperature as determined by the engine control module (ECM) or the powertrain control module (PCM). The IPC receives a GMLAN message from the ECM/PCM indicating the engine coolant temperature. The engine coolant temperature gage defaults to "�C" or below if:

* The ECM/PCM detects a malfunction in the engine coolant temperature sensor circuit.
* The IPC detects a loss of GMLAN communications with the ECM/PCM.
* The body control module (BCM) detects a loss of GMLAN communications with the ECM/PCM.
* The IPC detects a loss of GMLAN communications with the BCM.

Fuel Gage

The instrument panel cluster (IPC) displays the fuel level as determined by the engine control module (ECM)/powertrain control module (PCM). The IPC receives a GMLAN message from the ECM/PCM indicating the fuel level percent. The fuel gage defaults to empty if:

* The ECM/PCM detects a malfunction in the fuel level sensor circuit.
* The IPC detects a loss of GMLAN communications with the ECM/PCM.
* The IPC detects a loss of GMLAN communications with the body control module (BCM).

When the fuel level is less than a pre-determined value, the low fuel message is displayed in the DIC.

Odometer

The instrument panel cluster (IPC) contains a season odometer and trip odometer A or B in the trip/fuel menu. Momentarily press the trip/fuel switch in order to cycle through the trip/fuel menu. Press the set/reset switch momentarily, while a trip odometer is displayed, in order to reset the trip odometer. Pressing the set/reset switch for 2 seconds will reset a trip odometer to the distance travelled since the last ignition cycle. The vehicle mileage and trip mileage is displayed as determined by the IPC. The IPC calculates the mileage based on the GMLAN vehicle speed information from the ECM PCM. The IPC receives the vehicle odometer information from the body control module (BCM) via a GMLAN serial data circuit. The odometer will display 'error' if an internal IPC memory failure is detected. The odometer displays either miles or kilometers as requested through the English/Metric screen in the DIC Vehicle Information Menu.

PRNDL Display

The instrument panel cluster (IPC) displays the selected gear position as determined by the engine control module (ECM)/powertrain control module (PCM). The IPC receives a GMLAN message from the ECM/PCM indicating the gear position. The PRNDL display blanks if:

* The ECM/PCM detects a malfunction in the transmission range switch circuit.
* The IPC detects a loss of GMLAN communications with the ECM/PCM.
* The IPC detects a loss of GMLAN communications with the body control module (BCM).

Speedometer

The instrument panel cluster (IPC) displays the vehicle speed as determined by the engine control module (ECM)/powertrain control module (PCM). The IPC receives vehicle speed information from the body control module (BCM) via a GMLAN serial data message. The speedometer defaults to 0 km/h (0 mph) when the IPC detects a loss of GMLAN communications with the ECM/PCM or the BCM.

Tachometer

The instrument panel cluster (IPC) displays the engine speed as determined by the engine control module (ECM)/powertrain control module (PCM). The IPC receives a GMLAN message from the engine control module (ECM)/powertrain control module (PCM) indicating the engine speed. The IPC receives engine speed information from the body control module (BCM) via a GMLAN serial data message. The tachometer will default to 0 rpm if:

* The ECM/PCM detects a malfunction in the engine speed sensor circuit.
* The IPC detects a loss of GMLAN communications with the ECM/PCM.
* The IPC detects a loss of GMLAN communications with the BCM.