Message Center
Message Center
Overview
The message center is an integral part of the IPC (Instrument Panel Cluster) that receives and acts upon much of the same information that is input and used to operate the IPC (Instrument Panel Cluster) gauges, indicators, and warning indicators. The message center uses both hardwired and network based inputs to receive information.
The message center functionality is controlled through the message center switch (part of the LH (Left Hand) steering wheel switch), which is hardwired to the SCCM (Steering Column Control Module) through input and return circuits.
Whenever conditions are present that require a warning message, the message center replaces the last selected display with the new warning display. Once the message is reset or cleared, the message center returns to the last selected display. If multiple warnings are present, the message center displays each warning for approximately 4 seconds. Warning messages are also generally associated with other observable outputs of the IPC (Instrument Panel Cluster) (gauges, indicators and message center indicators). For example, when the BCM (Body Control Module) detects a low brake fluid condition, the BCM (Body Control Module) sends the IPC (Instrument Panel Cluster) a request to illuminate the brake warning indicator and a request to display the LOW BRAKE FLUID message in the message center. This allows the message center to be a more informative supplement to the IPC (Instrument Panel Cluster) gauges and indicators.
Another function of the message center is to display message center warning indicators. Similar to the interaction between the message center and the standard warning indicators, the message center often displays a warning message and illuminates the message center warning indicator at the same time. For example, if the PCM (Powertrain Control Module) detects low engine oil pressure, the PCM (Powertrain Control Module) sends a request to the IPC (Instrument Panel Cluster) to illuminate the low oil pressure message center indicator and to display LOW OIL PRESSURE in the message center. If multiple warnings are present requiring multiple message center warning indicator displays, the message center cycles or rotates through the displays in the same manner the message center cycles the text messages.
System Warning Messages
The system warning messages alert the operator to possible problems or malfunctions in the vehicle operating systems. System warning messages may be stand-alone messages but are often associated with another form of indication such as a gauge, an indicator or message center indicator. The message center displays the last selected feature if there are no additional warning messages. Once a warning message has been displayed, the message must be acknowledged to allow full functionality of the message center. Press the OK button to acknowledge and clear the warning message.
When the IPC (Instrument Panel Cluster) receives a request to display an informational warning message or a fault condition warning message, the message center may display one of the following warning messages:
General Vehicle Messages
Body
- DRIVER DOOR AJAR
- LIFTGATE AJAR
- PASSENGER DOOR AJAR
- REAR LEFT DOOR AJAR
- REAR RIGHT DOOR AJAR
- REMOVE OBJECTS NEAR PASSENGER SEAT
- TO STOP ALARM START VEHICLE
- TRANSPORT MODE CONTACT DEALER
Chassis
- BRAKE FLUID LEVEL LOW
- CHECK BRAKE SYSTEM
- CHECK PARK AID
- FUEL LEVEL LOW XXX MILES/KM TO E
- PARK BRAKE ENGAGED
- SERVICE ADVANCE TRAC
- TRACTION CONTROL OFF
- WASHER FLUID LEVEL LOW
Powertrain
- CHANGE ENGINE OIL SOON
- CHECK BATTERY CHARGE
- CHECK FUEL FILL INLET
- ENGINE COOLANT OVER TEMP
- LOW ENGINE OIL PRESSURE
- OIL CHANGE REQUIRED
Feature Messages
Active Park Assist
- ACTIVE PARK FAULT
Adaptive Cruise Control
- ADAPTIVE CRUISE MALFUNCTION
- ADAPTIVE CRUISE NOT AVAILABLE
- ADAPTIVE CRUISE NOT AVAILABLE SENSOR BLOCKED
- AUTOMATIC BRAKING TURNED OFF (base IPC (Instrument Panel Cluster))
- CRUISE CONTROL AUTOMATIC BRAKING TURNED OFF (optional IPC (Instrument Panel Cluster))
BLIS (Blind Spot Information System)- CTA (Cross Traffic Alert)
- BLIND SPOT NOT AVAILABLE SENSOR BLOCKED
- BLIND SPOT SYSTEM FAULT
- CROSS TRAFFIC NOT AVAILABLE SENSOR BLOCKED
- CROSS TRAFFIC SYSTEM FAULT
- CROSS TRAFFIC VEHICLE COMING FROM LEFT
- CROSS TRAFFIC VEHICLE COMING FROM RIGHT
EPAS (Electronic Power Assist Steering)
- POWER STEERING ASSIST FAULT
- SERVICE POWER STEERING
- SERVICE POWER STEERING NOW
Forward Collision Warning (If Equipped)
- COLLISION WARNING MALFUNCTION
- COLLISION WARN NOT AVAILABLE
- COLLISION WARN NOT AVAILABLE SENSOR BLOCKED
4WD (Four-Wheel Drive)
- 4X4 OFF
- CHECK 4X4
Hill Descent
- DRIVER RESUME CONTROL
- FOR HILL DESCENT REDUCE SPEED 20 MPH/32 KMH OR LESS
- FOR HILL DESCENT SELECT GEAR
- HILL DESCENT CONTROL ACTIVE
- HILL DESCENT CONTROL FAULT
- HILL DESCENT CONTROL OFF
- HILL DESCENT CONTROL OFF SYSTEM COOLING
- HILL DESCENT CONTROL READY
IA (Intelligent Access)
- ACCESSORY POWER ACTIVE
- KEY PROGRAMMED, 3 KEYS TOTAL
- KEY PROGRAMMED, 4 KEYS TOTAL
- MAX NUMBER OF KEYS PROGRAMMED
- NO KEY DETECTED
- PRESS BRAKE TO START
- RESTART NOW OR KEY IS NEEDED
- STARTING SYSTEM FAULT
- SHIFT TO PARK
Load Shed Control
- CHECK CHARGING SYSTEM
- LOW BATTERY LESS FEATURES (late build)
- TURN POWER OFF TO SAVE BATT (late build)
MyKey(R)
- BUCKLE UP TO UNMUTE AUDIO
- CHECK SPEED DRIVE SAFELY
- COULD NOT PROGRAM KEY
- MYKEY ACTIVE DRIVE SAFELY
- MYKEY NOT CREATED
- SPEED LIMITED TO 130 KM/H (80 MPH)
- VEHICLE AT TOP OF MYKEY SETTING
- VEHICLE NEAR MYKEY TOP SPEED
Off Road Mode
- EXITING OFF ROAD MODE
- OFF ROAD MODE ENABLED
- EXITING OFF ROAD MODE
- FOR OFF ROAD SLOW TO 5 MPH
Terrain Management
- MODE CHANGE NOT ACCEPTED RETRY
- TERRAIN MANAGEMENT MUD, RUT MODE
- TERRAIN MANAGEMENT NORMAL MODE
- TERRAIN MANAGEMENT SAND MODE
- TERRAIN MANAGEMENT SNOW MODE
- TERRAIN MANAGEMENT SYSTEM FAULT
TPMS (Tire Pressure Monitoring System)
- LOW TIRE PRESSURE
- TIRE PRESSURE MONITOR FAULT
- TIRE PRESSURE SENSOR FAULT
Trailer Sway
- TRAILER SWAY REDUCE SPEED
Service Procedure Messages
Tire Training
- TRAIN LEFT FRONT TIRE
- TRAIN RIGHT FRONT TIRE
- TRAIN LEFT REAR TIRE
- TRAIN RIGHT REAR TIRE
- TIRE TRAINING COMPLETE
- TIRES NOT TRAINED REPEAT
System Operation
System Diagram
Message Center
Network Message Chart
Module Network Input Messages - IPC (Instrument Panel Cluster)
Oil Change Minder
The message center provides an oil change minder to inform the driver that an oil change is required. The duration of the interval between oil changes is calculated in the PCM (Powertrain Control Module) and varies due to driving conditions. The PCM (Powertrain Control Module) assumes a base mileage of 16,090 km (10,000 mi) or 1 year for normal driving. However, this number is adjusted down for conditions such as high engine temperature, high engine RPM (Revolutions Per Minute), use of flex fuel and possibly low oil level. The PCM (Powertrain Control Module) calculates and provides an engine oil life percent message to the IPC (Instrument Panel Cluster). The IPC (Instrument Panel Cluster) further converts the remaining oil life using the driver's configured oil life start value and displays the oil life percentage, indicating the remaining oil life. The oil change minder can be reset at any time by the driver.
Compass Display
The compass signal originates with the GPS (Global Positioning System) antenna. No calibration or zone adjustment is available, as the compass heading is based on the GPS (Global Positioning System) signal. REFER to Global Position System Module (GPSM) Information and Entertainment Systems - Premium Plus (Premium Plus) or REFER to Global Positioning System Module (GPSM) Information and Entertainment Systems - Sony Sound ( Sony(R) Sound) for information on the GPS (Global Positioning System) signal.
Outside Air Temperature Display
The AAT (Ambient Air Temperature) sensor is hardwired to the PCM (Powertrain Control Module) through separate input and return circuits. The PCM (Powertrain Control Module) provides a reference voltage to the AAT (Ambient Air Temperature) sensor and monitors the change in voltage resulting from changes in resistance as determined by outside air temperature. The PCM (Powertrain Control Module) messages the outside air temperature data to the HVAC (Heating, Ventilation, and Air Conditioning) module through the BCM (Body Control Module). The HVAC (Heating, Ventilation, and Air Conditioning) filters the temperature data and sends the updated temperature status back to the BCM (Body Control Module). The BCM (Body Control Module) in turn messages the outside air temperature in degrees Celsius (metric) to the IPC (Instrument Panel Cluster). When the Fahrenheit (English) display is selected by the driver, the IPC (Instrument Panel Cluster) converts the Celsius to Fahrenheit and displays the temperature in the message center.
The HVAC (Heating, Ventilation, and Air Conditioning) 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 AAT (Ambient Air Temperature) sensor than the actual outside air temperature.
When the sensed outside temperature rises, the display updates slowly at varying rates based on vehicle speed. When the sensed outside temperature drops, the display updates more quickly following the drop experienced by the AAT (Ambient Air Temperature) sensor.
Powertrain Malfunction (Wrench) Message Center Indicator
The IPC (Instrument Panel Cluster) receives the ETC (Electronic Throttle Control), the transaxle and the 4WD (Four-Wheel Drive) status from the PCM (Powertrain Control Module).
When a fault condition exists in the ETC (Electronic Throttle Control) system, the PCM (Powertrain Control Module) provides the IPC (Instrument Panel Cluster) with the engine service required message to illuminate the powertrain malfunction (wrench) message center warning indicator.
When a fault condition exists in the transaxle, the PCM (Powertrain Control Module) provides the IPC (Instrument Panel Cluster) with the transmission malfunction indicator request to illuminate the powertrain malfunction (wrench) message center warning indicator.
When a fault condition exists in the 4WD (Four-Wheel Drive) system, the PCM (Powertrain Control Module) provides the IPC (Instrument Panel Cluster) with the AWD (All-Wheel Drive) lock status message to illuminate the powertrain malfunction (wrench) message center warning indicator.
Charging System Message Center Warning Indicator
The charging system message center warning indicator is controlled by the IPC (Instrument Panel Cluster) based upon data received from the BCM (Body Control Module). The BCM (Body Control Module) receives the charging system status from the PCM (Powertrain Control Module). When a fault is detected in the charging system, the BCM (Body Control Module) sends the IPC (Instrument Panel Cluster) a charging system status message to illuminate the charging system message center warning indicator. REFER to Charging System Description and Operation for additional information on the charging system operation.
Cruise Control Message Center Indicator
On base cruise control vehicles, the IPC (Instrument Panel Cluster) receives the cruise control status message from the PCM (Powertrain Control Module).
When the cruise control switch is placed in the ON position, the PCM (Powertrain Control Module) sends the IPC (Instrument Panel Cluster) a standby mode request through the cruise control status message and the IPC (Instrument Panel Cluster) illuminates the cruise control indicator in gray. When the cruise control is engaged, the PCM (Powertrain Control Module) sends a cruise control on request through the cruise control status message to the IPC (Instrument Panel Cluster) and the IPC (Instrument Panel Cluster) changes the cruise control indicator illumination from gray to green.
On vehicles equipped with adaptive cruise control, the IPC (Instrument Panel Cluster) receives the adaptive cruise control follow mode display message from the C-CM (Cruise-Control Module).
When the cruise control switch is placed in the ON position, the C-CM (Cruise-Control Module) sends the IPC (Instrument Panel Cluster) a standby mode request through the adaptive cruise control follow mode display message and the IPC (Instrument Panel Cluster) illuminates the cruise control indicator in gray. When the cruise control is engaged, the C-CM (Cruise-Control Module) sends a cruise control on request through the adaptive cruise control follow mode display message to the IPC (Instrument Panel Cluster) and the IPC (Instrument Panel Cluster) changes the cruise control indicator illumination from gray to green.
Low Oil Pressure Message Center Warning Indicator
The engine oil pressure switch is hardwired to the PCM (Powertrain Control Module). The PCM (Powertrain Control Module) provides the engine oil pressure status and engine RPM (Revolutions Per Minute) data to the IPC (Instrument Panel Cluster) over the HS-CAN (High Speed Controller Area Network). The IPC (Instrument Panel Cluster) requires engine RPM (Revolutions Per Minute) to be above 500 RPM (Revolutions Per Minute) before the message center displays the low oil pressure message center indicator.
The PCM (Powertrain Control Module) provides a reference voltage to the engine oil pressure switch when the ignition is in RUN. With the engine running and low or no oil pressure, the engine oil pressure switch remains open. The PCM (Powertrain Control Module) detects no change in the reference voltage and provides the IPC (Instrument Panel Cluster) a request to illuminate the low oil pressure warning indicator. With the engine running and sufficient oil pressure, the engine oil pressure switch closes, pulling the reference voltage low. The PCM (Powertrain Control Module) detects the low reference voltage and provides the IPC (Instrument Panel Cluster) a request to turn off the low oil pressure warning indicator.
The engine oil pressure switch is hardwired to the PCM (Powertrain Control Module). The IPC (Instrument Panel Cluster) receives the oil pressure warning message and the engine RPM (Revolutions Per Minute) message from the PCM (Powertrain Control Module). With the KOEO (Key ON Engine OFF), the IPC (Instrument Panel Cluster) does not display the low oil pressure message center warning indicator until the engine is started and it receives the engine RPM (Revolutions Per Minute) message.
Engine Over-Temperature Message Center Warning Indicator
The PCM (Powertrain Control Module) uses the CHT (Cylinder Head Temperature) sensor to measure the engine temperature. The IPC (Instrument Panel Cluster) receives the engine coolant temperature data message from the PCM (Powertrain Control Module). The IPC (Instrument Panel Cluster) requires 2 basic messaged inputs to control the engine over-temperature message center warning indicator. The first is the engine coolant temperature data message. The second is an engine overheat mitigation message. When the engine temperature reaches 121 C (250 F), or when the PCM (Powertrain Control Module) sends the engine coolant temperature data message, the IPC (Instrument Panel Cluster) illuminates the engine over-temperature message center warning indicator.
Grade Assist Message Center Indicator
The IPC (Instrument Panel Cluster) receives the grade assist on/off status from the PCM (Powertrain Control Module). When the grade assist function is selected off, the PCM (Powertrain Control Module) sends the transmission shift mode message to the IPC (Instrument Panel Cluster) to illuminate the grade assist message center indicator.
Low Fuel Message Center Indicator
The IPC (Instrument Panel Cluster) uses fuel level, running average fuel economy, odometer counts and fuel flow data to calculate the DTE (Distance To Empty) . The low fuel message center indicator is controlled using the calculated DTE (Distance To Empty). When the DTE (Distance To Empty) display is 120 km (75 miles) (with a MyKey(R) programmed key) or 80 km (50 miles) (with an administrator key) to empty or less, the IPC (Instrument Panel Cluster) illuminates the low fuel message center indicator.
Low Washer Fluid Message Center Indicator
The low washer fluid level sensor is hardwired to the IPC (Instrument Panel Cluster) through a single signal circuit. The low washer fluid sensor is grounded through a separate ground circuit. The IPC (Instrument Panel Cluster) provides a battery reference voltage to the washer fluid level switch. When the washer fluid is low, the washer fluid level switch closes to ground, pulling the reference voltage low. When the IPC (Instrument Panel Cluster) detects the washer fluid input pulled low, it illuminates the low washer fluid level message center warning indicator.
Door Ajar Message Center Indicator
The IPC (Instrument Panel Cluster) receives the door ajar status for the LF (Left Front), RF (Right Front), LR (Left Rear), RR (Right Rear) and the liftgate ajar switches from the BCM (Body Control Module). When the IPC (Instrument Panel Cluster) receives a driver door, passenger door, left rear door, passenger rear door or liftgate ajar status message from the BCM (Body Control Module) that one or more doors are open or ajar, the IPC (Instrument Panel Cluster) illuminates the appropriate door ajar message center warning indicator.
Check Fuel Fill Inlet Message Display
The PCM (Powertrain Control Module) monitors the fuel tank evaporative emission system for significant leaks that occur following refueling of the vehicle. Once the PCM (Powertrain Control Module) detects a fuel vapor leak, the PCM (Powertrain Control Module) sends a fuel fill inlet message to the IPC (Instrument Panel Cluster) to display the CHECK FUEL FILL INLET message. The PCM (Powertrain Control Module) only sets a fault code following a successful cruise test, which is initiated when the vehicle is driven at a steady speed above 64.36 km (40 mi) for a duration of approximately 4-5 minutes. If the PCM (Powertrain Control Module) is unable to successfully run the cruise test, the IPC (Instrument Panel Cluster) does not receive the fuel fill inlet message and the CHECK FUEL FILL INLET message remains off.
Shift To Park Message Display
The IPC (Instrument Panel Cluster) displays SHIFT TO PARK when the vehicle is turned off with the shifter out of the PARK (P) position. The IPC (Instrument Panel Cluster) provides a reference voltage to the park detect switch through the park detect signal, or input circuit. The IPC (Instrument Panel Cluster) provides the transaxle park status to the BCM (Body Control Module).
When the selector lever is out of the PARK (P) position, the park detect switch remains open to ground leaving the reference voltage high to the IPC (Instrument Panel Cluster). The IPC (Instrument Panel Cluster) sends a park status message to the BCM (Body Control Module), indicating the selector lever is not in PARK (P). The BCM (Body Control Module) monitors the ignition state and when the ignition is OFF with the selector lever out of PARK (P), the BCM (Body Control Module) sends the IPC (Instrument Panel Cluster) an intelligent access system status message to display the SHIFT TO PARK message display.
Hill Descent Control Message Display
The hill descent control system maintains vehicle speed on a downhill grade at operating speeds between 3.2 kmh (2 mph) and 32.2 kmh (20 mph). The system goes into standby mode on a flat or uphill terrain. The system deactivates at speeds above 64.4 kmh (40 mph). During periods of sustained use, the hill descent control system may automatically deactivate in order to cool the braking system.
When the hill descent control switch is pressed, a ground signal is sent to the PCM (Powertrain Control Module). The PCM (Powertrain Control Module) then sends a message to the ABS (Anti-Lock Brake System) module requesting system activation. The ABS (Anti-Lock Brake System) module uses inputs from the RCM (Restraints Control Module) and wheel speed sensors to determine the mode of operation.
The IPC (Instrument Panel Cluster) receives the hill descent mode status message from the ABS (Anti-Lock Brake System) module. The message center also displays hill descent control messages to inform the driver they have entered or exited various states of the hill descent control function.
Component Description
Steering Wheel Switch - Message Center
The message center switch portion of the LH (Left Hand) steering wheel switch is comprised of 5 buttons. Each button operates a unique switch within the message center switch portion of the LH (Left Hand) steering wheel switch assembly. Each button uses a different resistance value. The SCCM (Steering Column Control Module) sends out a reference voltage to the LH (Left Hand) steering wheel switch on the input circuit and monitors the voltage drop when a message center switch button is pressed. The voltage drop varies depending upon the resistance of the specific button pressed, indicating to the SCCM (Steering Column Control Module) which switch is pressed.
Low Washer Fluid Level Sensor
The low washer fluid level sensor is a reed type switch. The float assembly uses a magnet to close the contacts on the switch. The low washer fluid sensor is hardwired to the IPC (Instrument Panel Cluster) through a single signal wire and is grounded to a body ground through a separate circuit. The IPC (Instrument Panel Cluster) provides a battery reference voltage to the low washer fluid level sensor. When the washer fluid level is low, the float drops closing the switch and pulling the reference voltage low. When the washer fluid level is high, the float lifts off the switch and opens the circuit to the IPC (Instrument Panel Cluster) sending the reference voltage high.