GF82.85-P-2006GH Switch-on/Switch-Off Characteristics, Function

GF82.85-P-2006GH Switch-on/Switch-Off Characteristics, Function
- with CODE (352a) COMAND operating and display system
- except CODE (491) U.S. version
- except CODE (498) Japanese version

Activation of overall system
At position 1 circuit 15R, ON) the display is switched in, insofar ( as the COMAND operating, display and control module (A40/3) was switched on before the ignition key was last removed.

Turning the ignition-and-starter switch to roughly the 20 degrees position (circuit 15C, ON) activates all further subsystems. The COMAND operating, display and control module (A40/3) is then ready for operation. The system which was active before the last switch off (e.g. radio) is switched on and the appropriate default menu displayed.

If the COMAND operating, display and control module (A40/3) was switched off for longer than 30 min, a warning menu is displayed with general instructions on how to use the system.

Conduct when pushing "ON" button
The COMAND operating, display and control module (A40/3) can also be switched on even when the ignition key has been removed by pressing the "ON" button.

All the COMAND operating, display and control module (A40/3) functions are then available for roughly 30 min. After expiry of 30 min COMAND operating, display and the control module (A40/3) is automatically switched off.

If after approximately 30 min a switch off has taken place, the system can be switched back on again by pressing the "ON" button. The 30 min cycle will then start from the beginning again.

Switch-off characteristics
The COMAND operating, display and control module (A40/3) is switched off when the ignition key is removed ( circuit 15C, OFF). After this the navigation system's approximately 30 minute long overshoot time ("standby mode") starts. During this period all the important position finding parameters are stored.

Furthermore, the COMAND operating, display and control module (A40/3) is always in "standby mode", if the CAN interior is active.

Pressing the "Screen" function only induces the monitor to switch between the day, night and off modes.

Switch-off characteristics at undervoltage
The central computer in the COMAND operating, display and control module (A40/3) constantly monitors the battery voltage. Depending on the voltage value the system will act as follows:
- Battery voltage between 11.5 and 9.5 Volt (battery alarm range) If the battery voltage drops below 11.5 Volts, a message appears in the display requesting that the engine be switched on.

If the engine is not started up, yet another warning is issued after approx. 3 min have elapsed indicating that only 10 s remain to switch the engine on before the system is run down. In this case the starting of the engine prevents the system from being automatically run down. If the system has been run down and the voltage reading rises once again above 11.5 V, COMAND remains as it was, namely off.

If a system has been shut down it can still be switched back on again manually. The warning procedure is then performed anew each time, until the fault has been rectified.

- Battery voltage below 9.5 Volts (undervoltage) COMAND is automatically put into a predefined standby condition, in which only the battery voltage continues to be monitored. In addition to this the current operating status is stored.

The COMAND operating, display and control module (A40/3) cannot be operated in this state nor does it respond to the STAR diagnostics tool. Communication then no longer takes place between external components.