Instrument Cluster
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 illuminates briefly.
* The cruise engage indicator illuminates briefly.
* The engine oil pressure indicator illuminates briefly.
* The malfunction indicator lamp (MIL) illuminates briefly (not IPC controlled).
* The seat belt indicator illuminates for 70 seconds or until the driver seat belt is latched (not IPC controlled).
* The security indicator illuminates briefly.
* The tire pressure low indicator illuminates briefly.
* The vehicle dynamics caution (VDC) indicator illuminates briefly.
* All segments of the driver information center (DIC) illuminate briefly.
* All odometer segments illuminate briefly.
* The PRNDL segment illuminates briefly.
Indicators and Warning Messages
Refer to Indicator/Warning Message Description and Operation Indicator/Warning Message , Data Link Communications Description and Operation Description and Operation , and Body Control System Description and Operation Description and Operation.
Engine Coolant Temperature Gauge
The instrument panel cluster (IPC) displays the engine coolant temperature as determined by the engine control module (ECM). The IPC receives serial data message from the ECM indicating the engine coolant temperature. The engine coolant temperature gauge defaults to 60°C (140°F) or below if:
* The ECM detects a malfunction in the engine coolant temperature sensor circuit.
* The IPC detects a loss of serial data communications with the BCM.
* The BCM detects a loss of serial data communications with the ECM.
Fuel Gauge
The fuel level sender changes resistance based on the fuel level. The powertrain control module (PCM) monitors the signal circuit of the fuel level sender in order to determine fuel level. When the fuel tank is full, the sender resistance is low and the PCM senses a low signal voltage. When the fuel tank is close to empty (above 15% remaining), the sender resistance is high and the PCM senses a high signal voltage. The PCM uses the signal circuit of the fuel level sender in order to calculate the total remaining fuel percent in the tank. The PCM sends the fuel level message via the serial data circuit to the body control module (BCM). The BCM sends the fuel level percent to the instrument panel cluster (IPC) via the serial data circuit to display on the fuel gauge. The fuel level information is also used for misfire and evaporative emission (EVAP) diagnostics. When fuel levels are less than 15% of total fuel level the PCM SWITCHES TO A CONSUMPTION MODE. The PCM stops reading the fuel level sender and instead calculates the remaining fuel level, based on fuel injector rolling counts. This is done to reduce gauge error from fuel slosh. The PCM will remain in the fuel consumption mode until enough fuel is added to raise the total fuel level to 18% or higher. The PCM will resume measuring the fuel level from the fuel level sender after a 45 second timer has expired. The timer is used to prevent driving conditions from momentarily raising the fuel level.
The fuel gauge defaults to empty if:
* The ECM detects a malfunction in the fuel level sensor circuit.
* The IPC detects a loss of serial data communications with the BCM
* The BCM detects a loss of serial data communications with the ECM
When the fuel level is less than a pre-determined value, the low fuel indicator illuminates in the IPC.
Odometer
The IPC contains a season odometer and trip odometer A or B. Momentarily press the DIC trip/fuel button on the IPC in order to toggle between the season odometer and the trip odometer. Press the DIC set/reset button for greater than 0.25 seconds, while the trip odometer is displayed, in order to reset the trip odometer. The IPC displays the vehicle mileage and trip mileage as determined by the ECM. The IPC calculates the mileage based on serial data vehicle speed information from the ECM. The odometer will display 'error' if an internal IPC memory failure is detected. The odometer displays either miles or kilometers and can be set through the personalization programming menu in the DIC.
PRNDL Display
The IPC displays the selected gear position as determined by the ECM. The IPC receives a serial data message from the ECM indicating the gear position. The PRNDL display blanks if:
* The ECM detects a malfunction in the transmission range switch circuit.
* The IPC detects a loss of serial data communications with the BCM.
* The BCM detects a loss of serial data communications with the ECM.
Speedometer
The IPC displays the vehicle speed as determined by the ECM. The IPC calculates the mileage based on the serial data vehicle speed information from the ECM. Vehicle speed is sent from the transmission control module (TCM) as trans output rotations and received by the ECM and turned into vehicle speed. The ECM transmits vehicle speed to the body control module (BCM) which in turn transmits the vehicle speed to the IPC via the serial data circuit. The speedometer defaults to 0 km/h (0 mph) if:
* The IPC detects a loss of serial data communications with the BCM.
* The BCM detects a loss of serial data communications with the ECM.
Tachometer
The IPC displays the engine speed as determined by the ECM. The IPC receives a serial data message from the ECM indicating the engine speed. The ECM transmits the engine speed to the body control module (BCM) via the serial data circuit. The BCM then transmits the engine speed to the IPC via the serial data circuit. The tachometer defaults to 0 RPM if:
* The ECM detects a malfunction in the engine speed sensor circuit.
* The IPC detects a loss of serial data communications with the BCM.
* The BCM detects a loss of serial data communications with the ECM.
Battery Gauge
The instrument panel cluster (IPC) displays the voltage as determined by the regulated voltage control (RVC). The IPC receives serial data message from the BCM indicating the battery voltage. When the engine is ON, the gauge should be between 10-16 V. The gauge will default to 0 V if the IPC detects a loss of communication with the BCM.