Driver Information Center

DRIVER INFORMATION CENTER
The bottom portion of the IPC contains a twenty character dot matrix message center referred to as the Driver Information Center. The Driver Information Center is used to display driver selectable information and warning/status messages. Some messages may be disabled by Option Byte Bit settings.

Driver Selectable Information
Pressing the information (INFO) button cycles the Driver Information Center through a list of driver information parameters. The following list of information will be displayed:
^ Blank (no display)
^ Range (Analog Only)
^ Average Fuel Economy (Average MPG)
^ Instantaneous Fuel Economy (Instantaneous MPG) (Analog Only)
^ Fuel Used
^ Average Speed (MPH)
^ Oil Life Index
^ Engine RPM (Digital Only)
^ Battery Voltage
^ Coolant Temperature (Digital Only)
^ Cellular telephone Status
^ Elapsed Time
^ English/Metric Reset (Analog Only)
Pressing the INFO button again will cause the display to wrap to the first option.

NOTE: The IPC will blank the data portion of the following parameters on the Driver Information Center prior to receipt of valid data:
^ Instantaneous Fuel
^ Coolant Temperature
^ Fuel Level
^ Oil Life Index
^ Outside Air Temperature
^ Range
The IPC will dash the displays if the serial data line or an interacting module are not communicating.

Range
Vehicle Range is calculated by the IPC as described below.
Drivable range = Distance Sum/Fuel Sum x Scale Factor x Filtered Fuel in Tank

Separate accumulators are kept for fuel consumed and for distance traveled. These accumulators are not operator resettable. Distance has a resolution of 0.1 miles. Fuel consumed has a resolution of 0.00005 liters. This portion of the IPC will be dashed if there is a loss of PCM or PZM communications.

Average Fuel Economy (MPG)
Average Fuel Economy is calculated by the IPC as described below.
The AVERAGE FUEL ECONOMY can be displayed on the Fuel Data Center by pressing the "AVG" button or it can be displayed on the Driver Information Center by pressing the INFORMATION button until the display reads "AVG MPG" or (AVG L/100km) (Digital IPC only).

The value for Average Fuel Economy will be reset when AVERAGE FUEL ECONOMY is displayed on the Driver Information and the RESET button is pushed for greater than 1 second. Average Fuel Economy (AFE) is computed:

AFE = (Trip Distance)/(Trip Fuel Used) x Calibratable Scale Factor
Where "Trip" is the distance traveled or fuel used since the last reset. Fuel data is received from the PCM. This portion of the IPC will be dashed if there is a loss of PCM communications.

Instantaneous Fuel Economy (IFE)
Instantaneous Fuel Economy is calculated by the IPC as described below.
Instantaneous Fuel Economy (IFE) is based on the previous few seconds of driving as follows:
IFE - (Distance)/(Fuel Used) x Calibratable Scale Factor

Fuel data is received from the PCM. This portion of the IPC will be dashed if there is a loss of PCM or PZM communications. This message may be suppressed using Option Byte E.

Fuel Used
Fuel Used is calculated by the IPC as described below.
The "FUEL USED" option is calculated as:
Fuel Used - Fuel Sum x Scale Factor

"FUEL USED" feature is used to display the number of gallons or liters used since the last operator reset.
The value for fuel used will be reset when the fuel used display mode is active on the Driver Information Center and RESET button is pushed for greater than one (1) second. This portion of the IPC will be dashed if there is a loss of PCM or PZM communications. This message may be suppressed using Option Byte E. This data is lost if the battery is disconnected.

Vehicle Speed
Vehicle speed is calculated by the IPC based on the dedicated vehicle speed input. The dedicated vehicle speed input is sent from the PCM in the form of a pulse train consisting of 4000 pulses per mile. Vehicle speed may be offset from the actual vehicle speed if certain export option bits are set. The Driver Information Center display will not be turned on when the vehicle options are programmed in the assembly plant. This message may be turned on by setting a bit in the option byte E.

Note: Only turn this message on if a customer insists on having a digital speed readout. For Analog IPC's the digital speed readout, and the analog (needle) display may not always read the exact same speed. This must be explained to the customer prior to turning on the message. The Analog gage still meets all government requirements even though the Digital and Analog readouts may be slightly different.

Average Speed
Average Speed (MPH) is calculated by the IPC as described below.
The "AVERAGE SPEED" feature is an indication of the vehicle's average road speed since the last reset of the parameter.
Average Speed = Total Distance Traveled/Total Time (the ignition switch is in "RUN")

The display is centered on the Driver Information Center with these graphics:
English XXX.X AVG MPH
Metric XXX.X AVG km/h

If AVERAGE SPEED is the Driver Information Center Display Mode at power OFF it will be the display mode at power ON after initialization, if no Driver Warning messages are current.

To reset the AVERAGE SPEED value, the AVERAGE SPEED must be displayed on the Driver Information Center by using the INFORMATION key. Once AVERAGE SPEED is displayed, pushing the RESET key for greater than one second will clear the distance and time registers and cause the following to be displayed for the duration of the key press and for 500 milliseconds after the key is released:
English 0.0 AVG MPH
Metric 0.0 AVG km/h

The AVERAGE SPEED display mode can be exited by pushing the INFORMATION key. Elapsed time will be the subsequent display mode. This message may be suppressed using Option Byte E.

Oil Life Index
Oil Life Index is calculated by the PCM and sent to the IPC via the Class 2 serial data bus.
Oil life left is displayed as "### OIL LIFE LEFT", where ### represents the approximate percentage of useful oil life remaining. This figure is calculated by the PCM and sent to the IPC via Class 2 serial data bus. When oil life reaches 0% the "CHANGE ENGINE OIL" message will be displayed.
After an oil change, the index may be reset by displaying the oil life index and then pressing and holding the "RESET" button for approximately 5 seconds. When the value is reset, 100 will be displayed for the Oil Life Index.

Engine RPM (Digital IPC only)
Engine RPM is calculated by the IPC as described below.
The Engine RPM (tachometer) gage is driven by a direct input from the PCM. Instantaneous engine speed (RPM) is calculated from the time difference between two consecutive tachometer pulses. This message may be suppressed using Option Byte E.

Battery Voltage
Battery Voltage is directly measured and displayed by the IPC. Controlled power is used as a reference. The displayed range is from 9.0 to 16.2 volts. This message may be suppressed using Option Byte E. This battery voltage may be different than the voltage measured at the battery itself.

Coolant Temperature
Coolant temperature is sent from the PCM to the IPC via Class 2 serial data bus. This message may be suppressed using Option Byte E. The displayed temperature will reflect the current English/Metric setting. This message is suppressed by default on analog IPCs.
Cellular Telephone Status
Cellular telephone status, if installed, is displayed by the IPC as listed below:
^ PHONE NO HANDSET
^ PHONE OFF
^ PHONE NO SERVICE
^ PHONE ON
^ PHONE LOCKED
^ PHONE ROAM A
^ PHONE ROAM B
^ PHONE PAUSE
^ PHONE CALL

Elapsed Time
Elapsed Time is calculated by the IPC as described below.
The stop-watch TIMER is available for display on the Driver Information Center by pushing the TIMER key to reach the Timer display on the Driver Information Center.
The "TIMER" display will be centered on the Driver Information Center with the following graphics:

TIMER OFF Hours:Minutes:Seconds
OR
TIMER ON Hours:Minutes:Seconds

Each of the fields for Hours, Minutes, and Seconds are two numeric digits.
For the Digital IPC only, if the TIMER is not displayed, pushing the TIMER button will change the Driver Information Center display mode to Stop-Watch Timer and display the appropriate graphics. If the timer is already displayed, pushing TIMER will start the timer if it is not running and stop the timer if it is running.
If Display OFF mode is active, activating the TIMER key will cause the Driver Information Center to be illuminated with the Driver Information Center in the Timer Display mode.
Once the Timer is displayed on the Driver Information Center, the INFORMATION key will be used to exit the Timer Stop-Watch mode. The Driver Information Center will exit the Timer Stop-Watch display function and retain the mode of the Timer Stop-Watch in the condition it was prior to exiting.
The RESET key is used to clear the Stop-Watch Timer to zero. With the timer displayed on the Driver
Information Center, the RESET key must be held for greater than one second for the timer to be cleared to zero. The Driver Information Center will display:

TIMER OFF 00:00:00
OR
TIMER ON 00:00:00

Pushing RESET will not stop the timer if it is running, nor will it start the timer if it is stopped. The ELAPSED TIME display mode can be exited by pushing the INFO key.

For Analog IPC's only, pushing the "INFO" button to get to a TIMER XX:XX:XX" display to turn the timer on, Push the INFO RESET button momentarily. Do the same to turn timer off. Pushing and holding the INFO RESET button for about 1 second will reset the timer to 00:00:00. Pressing "INFO" button will advance display to the next available Driver Information Center information display.
English/Metric Reset
English/metric Reset is accomplished by the IPC as described below:
Digital Press the ENG/MET switch.
Analog Press INFO until ENGLISH/METRIC RESET is displayed. Press INFO RESET and the mode will change.
Changing the ENG/MET mode will cause the following displays to be affected:
Vehicle Speed MPH (km/h)
Season Odometer MILES (km)
Trip Odometer MILES (km)
Range MILES (km)
Temperature F° (C°)
Fuel Economy MPG (L/100 km)
Fuel Level GAL (L)

Dynamic Parameters
The IPC blanks the data portion of the following parameter displays prior to receipt of valid data:
^ Instantaneous Fuel
^ Fuel Level
^ Outside Air Temperature
^ Coolant Temperature
^ Oil Life Index
^ Range

The Digital IPC will dash all displays, except Vehicle Speed and Odometers, if the serial data link or state-of-health of all microprocessors is determined lost. Selective dashing of displays is indicative of an inability to communicate with only certain microprocessors on the link.

The Analog IPC will dash all Driver Information Center parameters and NOT drive Fuel Level and Coolant Temperature needles, if the serial data link or state-of-health of all microprocessors is determined lost. Selective dashing or inoperative needles may be indicative of an inability to communicate with only certain microprocessors on the link.