Message Center Displays

Compass (If Equipped) (Without Touchscreen Audio)

The compass is displayed as a 1 or 2 character display in the message center. The IPC receives the GPS compass direction from the GPSM over the MS-CAN.

Compass (If Equipped) (With Touchscreen Audio)

The compass is displayed as a 1 or 2 character display in the message center. The IPC receives the compass data from the APIM over the I-CAN.

DTE Display

The DTE is displayed in the trip computer portion of the message center. The DTE function is calculated in the IPC and displays the approximate distance that can be driven. The DTE is calculated using the remaining fuel in the tank, rate of change based on miles driven and the current Running Average Fuel Economy (RAFE). Since the Running Average Fuel Economy (RAFE) is an average of fuel economy over time the displayed DTE could differ significantly from the current DTE. There are a number factors that could impact the current DTE as follows:

Changing between towing/not towing
Changing driving between city and highway
Allowing the vehicle to idle for long periods of time
Parking or driving on grades
Not using a type of fuel consistently (E85 or non ethanol based)
Over-fueling or not filling the tank completely (partial refueling)

Over time with consistent driving conditions, the current DTE is much closer to the displayed DTE.

Odometer

The IPC receives the wheel rotation count message from the BCM over the MS-CAN. The BCM receives the wheel rotation count from the ABS module over the HS-CAN. The IPC monitors the wheel count input from the BCM and commands the odometer with a digital display in the message center.

Outside Air Temperature Display

The Ambient Air Temperature (AAT) sensor provides the ambient air temperature data used for the outside air temperature display in the IPC. The ambient air temperature sensor is hardwired to the PCM through separate input and return circuits. The PCM provides a reference voltage to the ambient air temperature sensor and monitors the change in voltage resulting from changes in resistance as determined by outside air temperature. The PCM filters the ambient air temperature input and sends the air ambient temperature filtered message to the BCM over the HS-CAN. The BCM sends the air ambient temperature filtered message to the IPC over the MS-CAN.

Due to the location of the Ambient Air Temperature (AAT) sensor, it is greatly influenced by heat generated from outside the vehicle. For this reason the outside air temperature value displayed in the IPC does not update quickly in the upward (hotter) direction under 38 km/h (24 mph). This update strategy is used because the PCM is unable to determine whether the increase in temperature is truly from an ambient temperature rise or by heat generated from vehicle heat surrounding the sensor.

The outside air temperature display in the IPC updates in the upward (hotter) direction quicker under the following situations:

if the vehicle is driven (approximately 38 km/h [24 mph]) continuously without the vehicle speed dropping for approximately 90 seconds.
if the vehicle is allowed to sit with the engine off for approximately 3 hours (the outside air temperature display in the IPC immediately updates to reflect the current ambient conditions since the engine has cooled sufficiently and no longer has an effect on the outside air temperature sensor reading).
if the Ambient Air Temperature (AAT) sensor drops below 30°C (86°F).

NOTE: If a warm vehicle is left idling for more than 5 minutes, the outside air temperature display freezes until the vehicle is driven above 38 km/h (24 mph) for a continuous 6 minutes (to remove upheat).

NOTE: The outside air temperature does not update when the engine is at idle.

NOTE: If the vehicle speed drops below the programmed speed (approximately 38 km/h [24 mph]) before the outside air temperature display in the IPC begins to update, the PCM logic resets and the time starts over.

Because this filtering strategy exists, it may be necessary to drive the vehicle continuously (approximately 38 km/h [24 mph]) for approximately 90 seconds when observing the outside air temperature display operation. After the vehicle has been driven (approximately 38 km/h [24 mph]) for 90 seconds, the outside air temperature display in the IPC should start to filter upward toward the actual outside air temperature. Depending on the difference between what the outside air temperature is displaying in the IPC and the actual outside temperature, it can take several minutes for the outside air temperature display in the IPC to reach the actual outside temperature.

The outside air temperature display in the IPC does not filter in the downward (colder) direction and always displays the coldest temperature detected by the sensor even when the vehicle is stationary and idling. When the outside Ambient Air Temperature (AAT) is lower than the temperature displayed in the IPC, the IPC immediately updates the displayed temperature downward to reflect the colder ambient air temperature, even at idle.

PRNDL Display

The IPC receives the transmission gear display, transmission gear display mode and transmission gear lever position messages from the BCM over the MS-CAN. The BCM receives the transmission gear display, transmission gear display mode and transmission gear lever position messages from the PCM/ TCM over the HS-CAN.

The IPC also uses a park position detect switch (part of the selector lever) input to signal the IPC that the shift lever is fully seated in the PARK (P) position. The IPC compares the park position detect switch input with the transmission mode display message sent from the PCM/ TCM.

The IPC provides a reference voltage to the park position detect switch. When the gearshift is in PARK (P), the park detect switch opens the circuit to ground and the IPC detects the high reference voltage. When the selector lever is moved out of PARK (P), the park position detect switch closes to ground, pulling the reference voltage low to the IPC.

The SelectShift® display indicates to the driver which gear is currently selected when the transmission is in the SelectShift® mode. When the transmission is in SelectShift® manual mode, the gear number is displayed in the SelectShift® display area next to the PRNDL display.

The progressive range select display provides a numerical display of the lower transmission ranges and indicates to the driver which gear is currently selected when the driver has manually shifted to a lower range (1, 2, 3, 4, 5 or 6).