Message Center - Electric - System Operation and Component Description: Displays
Adaptive Cruise Control
The message center provides a display showing the ACC gap setting, set speed and a graphical image of a vehicle from behind. The stop and go feature (part of the ACC) provides message displays to indicate the vehicle is stopped and to press resume to engage the cruise control again.
Battery Charge Range
The message center provides a battery charge range display that indicates the vehicle drive range based on the current battery charge. The battery charge range displays when there is no active navigation route selected.
Compass
The compass direction 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).
Digital Speedometer
The IPC provides a redundant digital speedometer display in the message center. The digital speedometer display operates using the same vehicle speed inputs used to control the speedometer gauge. See Speedometer. Refer to: INSTRUMENT PANEL CLUSTER (IPC) - VEHICLES WITH: 12 INCH CENTER DISPLAY SCREEN or INSTRUMENT PANEL CLUSTER (IPC) - ELECTRIC, VEHICLES WITH: 15.5 INCH CENTER DISPLAY SCREEN .
Forward Collision Alert
The message center provides a forward collision alert display when a possible forward collision is detected due to a short following distance to the vehicle in front and little or no driver intervention is detected.
Lane Keeping System
The lane keeping system provides the driver with a lane keeping alert when unintentional drifting outside of the lane is detected. The IPC provides a lane keeping display of the vehicle in the middle of a lane with right and left lane markers to indicate the vehicle position with relation to the lane markings as well as overlay or popup messages to alert the driver when they are drifting out of the lane. The lane markers change color to indicate the condition associated with a specific condition and action or warning as controlled by the lane keeping system. The IPC also provides a lane keeping system message center off indicator to inform the driver that the lane keeping system is turned off. When the lane keeping system is turned off, the IPC turns on the lane keeping system RTT and turns off the lane keeping system display.
Lane Centering Aid System
The lane centering aid system is part of the advanced driver assist system. The lane centering aid system allows the driver in certain driving situations, such as driving on a highway, to remove the hands from the steering wheel while the vehicle is in motion. The system will help keep the vehicle within the lane markings. The message center provides a graphic display of a vehicle with right and left lane markings to indicate the vehicle position, and pop up warnings when driver takeover is required to maintain control of the vehicle.
Odometer
The IPC monitors the odometer count input from the PCM and commands the odometer with a digital display in the message center.
Outside Air Temperature
The Ambient Air Temperature (AAT) sensor is hardwired to the PCM through separate input and return circuits. The PCM provides a reference voltage to the Ambient Air Temperature (AAT) sensor and monitors the change in voltage resulting from changes in resistance as determined by outside air temperature.
The PCM sends the ambient air temperature data to the HVAC module where the temperature data is filtered. The HVAC module sends the filtered outside air temperature data to the IPC to display the outside air temperature.
The HVAC module is programmed to update the messaged outside temperature data at different rates depending on several criteria to prevent false temperature displays due to a condition known as heat soaking. Heat soaking is where the outside air temperature is hotter in the location of the Ambient Air Temperature (AAT) sensor than the actual outside air temperature.
The outside air temperature display update strategy requires a starting temperature to update from. This starting temperature is controlled based on the length of time the engine is off and the engine temperature. When the engine has been off for longer than 4 hours, the update strategy begins with the unfiltered ambient air temperature input to the PCM. If the engine has been off for less than 4 hours, and the engine coolant temperature is less than 30deg. C (86deg. F), the update strategy begins with the filtered ambient air temperature equal to the unfiltered ambient air temperature. If the engine has been off for less than 4 hours, and the engine coolant temperature is greater than 30deg. C (86deg. F), the update strategy begins at the stored previous outside air temperature value.
When the sensed outside temperature rises and the vehicle speed is above 32 km/h (21 mph), the outside air temperature display updates after approximately 90 seconds. As the vehicle speed increases, the outside air temperature display updates at a faster rate that is proportional to the increase in vehicle speed. Once the vehicle speed exceeds 80 km/h (50 mph), the display updates without any delay. If the vehicle speed drops below 32 km/h (21 mph), the update delays reset. When the sensed outside temperature drops, the display updates more quickly following the drop experienced by the Ambient Air Temperature (AAT) sensor.
PRND
The message center provides the PRND display indicating which gear position the transmission is currently in, selected by the driver.
Speed Sign
The speed sign display indicates the speed limit recognized by the system as the current posted speed limit based on the last posted speed sign recognized. The IPC uses speed sign recognition data provided by the IPMA.