Message Center Displays

Average Fuel Economy (AFE)

Average Fuel Economy (AFE) is calculated using the following messaged inputs:

Fuel flow volume display
Odometer count
Ignition key type
Vehicle speed
Engine rpm data
Engine status

All messaged inputs, except for the ignition key type, are sent to the GWM by the PCM over the HS-CAN1. The GWM sends all message inputs, except for the ignition key type, to the IPC over the HS-CAN3. The GWM receives the ignition key type message from the BCM over the HS-CAN1. The IPC receives the ignition key type message from the GWM over the HS-CAN3.

Compass (Without Touchscreen Audio)

The compass is displayed as a 1 or 2 character display in the message center that indicates the current direction of the vehicle (N, NE, E, SE, S, SW, W, or NW). The IPC receives the GPS compass direction from the GWM over the HS-CAN3. The GWM receives the GPS compass direction from the GPSM over the MS-CAN.

Compass (With Touchscreen Audio)

The compass is displayed as a 1 or 2 character display in the message center that indicates the current direction of the vehicle (N, NE, E, SE, S, SW, W, or NW). The IPC receives the compass direction from the APIM over the HS-CAN3.

DTE

The DTE is calculated in the IPC using the Running Average Fuel Economy (RAFE), which is the fuel economy over the last 480 km (300 miles), and the fuel level input from the fuel sender(s) to determine how many miles the vehicle can be driven based on the remaining fuel in the fuel tank. If the fuel economy is relatively constant, the DTE can be off over a 50 mile range by -24% to +38%. The DTE display and the fuel gauge both use the fuel level input from the fuel tank to provide their respective functions. If the fuel gauge doesn't function correctly, both the fuel gauge and the DTE display are affected.

The IPC defaults to around 21 mpg when the battery is initially connected and changes based on driving habits and conditions. Generally, the driver should be getting somewhere between 13-27 mpg.

NOTE: The actual DTE can be higher or lower than the DTE displayed in the message center due to changes in driving conditions. It is important to understand how the DTE is calculated and the factors that impact the DTE display when determining how to address any DTE concerns.

Since the DTE is calculated and averaged over a longer period of time (480 km [300 miles]), varying driving conditions can have a significant impact on the current or short term DTE as opposed to the displayed DTE. This difference often leads to customer complaints of incorrect or invalid DTE. The following list provides some (not all) of the driving conditions that may lead to an incorrect or fluctuating DTE concern:

Changing between towing/not towing
Changing driving between city and highway
Allowing the vehicle to idle for long periods of time
Using the remote start feature frequently to allow the vehicle to warm up, particularly when parked on a grade
Parking or driving on grades
Inconsistent use of gasoline or E85 fuels
Over-fueling or not filling the tank completely (partial refueling)

To better illustrate the affects of how driving conditions can affect DTE, refer to the 2 following examples. The first example below illustrates how the following observations are normal and expected since the low fuel reminder is triggered from a fixed distance to empty.
- If while driving, the low fuel reminder (low fuel indicator and low fuel warning message) displays when the DTE equals 80 km (50 miles) and the fuel level is 1/8th of a tank and the driver adds 11 L (3 gallons) of fuel, the new DTE may become 125 km (98 miles). After continued highway driving, the low fuel reminder may now display when the fuel level is less than 1/8 tank.
The second example (below) illustrates what occurs when idling on an incline. In this example, the customer should be made aware of how the condition will correct after a few minutes of idling on a level surface.
- If the customer stops and parks the vehicle on an incline in a driveway, then in the morning remote starts the vehicle, allowing the engine to idle for 10 minutes, the DTE may now equal 105 km (55 miles). As the customer drives, the low fuel reminder displays when the DTE equals 80 km (50 miles). Finally, after 5 more minutes of driving, the DTE is back to 80 km (96 miles) and the low fuel reminder extinguishes.

Factory-Transport Mode

During vehicle build, some modules, such as the IPC and the BCM, are set in factory mode. While in the factory mode the IPC displays FACTORY MODE CONTACT DEALER in the message center. If the vehicle is set in factory mode, the system does not automatically exit the mode and must be manually set to either the transport or normal operation mode.

When the vehicle build is complete, the vehicle is set to transport mode. While in transport mode, the IPC displays TRANSPORT MODE CONTACT DEALER in the message center. Transport mode is used to reduce the drain on the battery during longer periods where the vehicle is not used. Various systems may be altered or are disabled when in the transport mode. The vehicle automatically reverts to normal operation mode after being driven 201 km (125 mi).

The IPC receives the life cycle mode message from the GWM over the HS-CAN3. The GWM receives the life cycle mode message from the BCM over the HS-CAN1.

MyKey ® Function

The IPC provides message center displays for the MyKey ® feature. MyKey ® displays are controlled through the IPC software based on the MyKey ® settings, configured through the message center, and the type of key in use (MyKey ® or administrator key). The MyKey ® function also uses messages received by the IPC for other indications such as vehicle speed for speed limiter displays.

Odometer

The IPC uses ignition status, transport mode, vehicle configuration and trip odometer verify messages to determine when to display the odometer and the odometer count message to provide the actual odometer reading. The IPC receives the odometer count message from the GWM over the HS-CAN3. The GWM receives the odometer count from the PCM over the HS-CAN1. The IPC monitors the odometer count input from the GWM and commands the odometer with a digital display in the message center.

The IPC receives the ignition status, transport mode, vehicle configuration and trip odometer verify messages from the GWM over the HS-CAN3. The GWM receives the ignition status, transport mode, vehicle configuration and trip odometer verify messages from the BCM over the HS-CAN1.