Driver/Vehicle Information Display: Description and Operation
MULTI-CENTER DISPLAYGENERAL DESCRIPTION
Two types of multi-center display are available; low grade type and middle grade type The middle grade type display can show a message based on information, which is obtained via M bus and CAN bus communication In addition, the middle grade type display offers a service mode function (self-diagnosis), overwrite (customize) function of the ETACS and multi-center display setting
Character display function of low grade multi-center display
- Clock display (incorporating clock)
- Audio system operation display (communicating with radio and CD player via M bus)
- Compass display (incorporating compass sensor)
- Ambient air temperature display (communicating with the Ambient sensor)
Graphical display function of middle grade multi-center display
- Clock display (incorporating clock)
- Calendar display
- Audio system operation display (communicating with radio, CD player and CD changer via M bus)
- Speaker test display (communicating with radio, CD player and CD changer via M bus)
- Compass display (incorporating compass sensor)
- Ambient air temperature display (communicating with the A/C-ECU via CAN bus)
- Freeze warning display (communicating with the A/C-ECU via CAN bus)
- A/C operation display (communicating with the A/C ECU via CAN bus)
Multi-Center Display System (Middle Grade Type) Part 1:
Multi-Center Display System (Middle Grade Type) Part 2:
Multi-Center Display System
COMMUNICATION ERROR PROCESSING
The multi-center display unit (middle grade type) communicates with specific units via CAN and M bus lines If an abnormality occurs (such as communication cancellation, interruption or out-of-range data), the screen will be frozen for some time If a correct signal is received within specific period after that, the screen will be updated If not, "COMMUNICATION ERROR" will be displayed on the screen This screen indicates a failure in the multi-center display unit (middle grade type) itself, communication error with relevant units, components or sensor In this case, you can pinpoint a trouble spot according to the CAN communication DTC code chart.
FAILURE DIAGNOSIS SERVICE MODE FUNCTION
The multi-center display unit (middle grade type) with the given functions for the failure diagnosis service
Starting up the service mode
1. ignition switch "LOCK" (OFF) position
2. Turn the ignition switch to the "ACC" position while depressing the "DISP" button on the multi-center display unit (middle grade type) After approximately 5 seconds, the service mode start-up screen is displayed.
Communication check
1. Activate the service mode start-up screen
2. ignition switch "ON" position
3. Choose "communication check mode" by pressing the function button switch 2
4. Execute "ENTER" by pressing the function button switch 3
5. The multi-center display checks the communication conditions and displays the check result.
Monitor check
1. Choose "Monitor check" from the service mode start-up screen by pressing function button switch 2, and then execute "ENTER" by pressing function button switch 3.
2. Choose a color by function button switch 2, and then execute "ENTER" by function button switch 3 You can check the chosen color on the screen.
Compass check
1. Choose "Compass check" from the service mode start-up screen by pressing function button switch 2, and then execute a check by pressing function button switch 3.
2. The multi-center display performs check and then displays the check result.
Vehicle check
1. Choose "vehicle check" from the service mode start-up screen by pressing function button switch 2, and then execute a check by pressing function button switch 3
2. The multi-center display performs check and displays the check result Operate the lighting switch or the ignition switch Check whether the multi-center display screen corresponds to that operation.
Auto check
1. Activate the service mode start-up screen
2. Turn the ignition switch to "ON" position
3. Choose "Auto check" by pressing function button switch 2
4. Execute "ENTER" by pressing the function button switch 3
5. The multi-center display unit checks the communication condition, and then shows the check results of "Communication check", "Monitor check", "Compass check", and "Vehicle check" Then the multi-center display ceases CAN communication in approximately seven seconds
Release of service mode
Move from the check result screen to the service mode start-up screen by pressing "ENTER" function button switch 3 If you press "BACK" function button switch 1 during processing, the checks will be cancelled and the screen returns to service mode start-up screen
Fail-safe function of the multi-center display unit (middle grade type)
If abnormal power supply voltage or abnormally high temperature is detected in the multi-center display unit (middle grade type), a fail-safe function will be activated to protect the unit, and then blank the screen
Fail-safe function is activated when:
Power supply voltage is abnormal
- Excessively low voltage: Power supply voltage remains 9 volts or less for approximately 10 seconds
- Excessively high voltage: Power supply voltage remains 17 volts or more for approximately 10 seconds
Abnormally high temperature is detected in the unit
- Internal temperature remains 95 degrees C (203 degrees F) for 60 seconds
If an abnormal voltage or temperature is detected, the multi-center display unit will sound its buzzer to indicate this and activate a message to blank the screen in approximately seven seconds
NOTE: The unit blanks the screen immediately when the power supply voltage reaches 18 volts
Fail-safe function is deactivated when:
Power supply voltage is abnormal
- The fail-safe function will be deactivated if the power supply voltage remains 10 volts or more for approximately five seconds, or the ignition switch is turned to the "LOCK" (OFF) position
- The fail-safe function will be deactivated if the power supply voltage remains 17 volts or less for approximately five seconds or more, or the ignition switch is turned to the "LOCK" (OFF) position.
Abnormally high temperature is detected in the unit.
- The fail-safe function will be deactivated if its internal temperature has reduced to 85 degrees C (185 degrees F) or less, or the ignition switch is turned to the "LOCK" (OFF) position.