Principles of Operation
PRINCIPLES OF OPERATIONThe message center electronic functions use hardwired inputs, the standard corporate protocol (SCP) network, and the controller area network (CAN) to transmit and receive information. It is very important to understand:
- where the input (command) originates.
- all the information (messages) necessary in order for a feature to operate.
- which module(s) receive(s) the input or command message.
- if the module which received the input (message) controls the output of the feature, or if it outputs a message over the CAN circuit to another module.
- which module controls the output of the feature.
The message center provides the following features:
- Information displays
- Setup displays
- System warnings
The message center information can be selected through the message center buttons.
Information Displays
The information displays are non-timed modes. The selected mode remains on until the driver presses a message center switch to change the mode, or until it is overridden by another mode. The information display modes are:
- Trip odometer A and trip odometer B/odometer
- Distance to empty
- Average fuel economy
- Instantaneous fuel economy
- Elapsed time
Setup Displays
The setup displays are timed modes and terminate after a finite interval. Press the SETUP button for the following displays:
- System check
- Display (odometer/speedometer)
- Text size (normal/large)
- Units (English/metric)
- Language
- Oil minder start value
System Check Displays
Selecting this function from the SETUP MENU causes the message center to cycle through each of the systems being monitored. For each of the monitored systems, the message center indicates either an OK message or a warning message for 3 seconds. Pressing the SELECT control switch cycles the message center through each of the systems being monitored. The system check report is as follows:
- OIL LIFE - PRESS RESET IF NEW OIL
- WASHER FLUID
- AIR SUSPENSION
- RECONFIGURABLE TELLTALES
- OK
- FAILED RED
- FAILED AMBER
System Warnings
The system warnings alert the operator to possible problems or malfunctions in the vehicle operating systems. In the event of a multiple warning situation, the message center cycles the display to show all warnings, by displaying each message for 4 seconds. The message center displays the last selected feature if there are no more warning messages. This allows the operator full functionality of the message center after acknowledgement of the warning message by pressing the RESET button and clearing the message. The warning messages are divided into 3 categories:
- Cannot be reset until the condition is corrected.
- Reappear on the display 10 minutes from the reset if the condition is not corrected.
- Do not reappear until an ignition OFF-ON cycle is completed.
The warning display that cannot be reset is:
- DOOR AJAR
The warning messages that reoccur after 10 minutes are:
- COOLANT OVER TEMPERATURE
- POWERTRAIN MALFUNCTION
- CHECK FUEL CAP
- LOW FUEL
- CHECK AIR SUSPENSION
The warning messages that can display whenever the ignition switch is turned from the OFF position to the ON position are:
- OVERDRIVE ON/OFF
- TRUNK AJAR
- LOW TIRE PRESSURE
- TIRE PRESSURE MONITOR FAULT
- TIRE PRESSURE SENSOR FAULT
- CHECK COMPASS MODULE
- LOW WASHER FLUID
- CHANGE ENGINE OIL