GF82.85-P-0003-07TXA Cockpit Management and Data System (COMAND) Switch On/Off Behavior
GF82.85-P-0003-07TXA Cockpit Management And Data System (COMAND) Switch On/Off Behavior
- with CODE (527) COMAND APS with single DVD drive (with navigation)
- with CODE (530) COMAND APS USA (with navigation system)
Switch-on characteristics
Navigation system activation
If the driver door is opened the navigation is activated automatically via the controller area network bus class B (interior) (CAN-B). This procedure will last about 2 s and may be accompanied by almost imperceptible noise of the Digital Versatile Disc (DVD) drive integrated into the navigation processor (N41/1). The display of the COMAND operating, display and controller unit (A40/3) remains switched off.
If, as a result of this, no status change occurs at the EIS [EZS] control unit (N73), e.g. "circuit 5C ON" or "circuit 15R ON", the navigation processor remains activated for t = 30 min. This is followed by an automatic switch off.
Activating the overall system
Position 1
Insert transmitter key (A8/1) into EIS [EZS] control unit. In position "circuit 5C ON" the bus systems are activated for t = 3 min only in order to ensure a faster switch-on cycle. If the COMAND operating, display and controller unit is switched on using the ON button (ON/OFF), automatic shutoff occurs after t = 30 min.
Position 2
The unit is switched on by turning the transmitter key into position 1 "circuit 5R ON", provided it was switched on before the last time the transmitter key was removed.
The function options are restricted to:
^ Operation of the COMAND operating, display and controller unit
^ Multifunction display (A1p13) in the instrument cluster (A1)
^ Operation via multifunction steering wheel
Position 3
All the functions in the vehicle are operational by continuing to turn the transmitter key into position 2 "circuit 15 ON". The system which was active before it was last switched off (e.g. radio) is switched on and the corresponding basic menu is displayed. If the COMAND operating, display and controller unit was switched off for longer than t = 30 min, a warning menu containing general information on how to operate the system is displayed.
Position 4
The engine is started by turning the transmitter key into position 3 "circuit 50 ON". If a considerable voltage drop occurs while starting the engine, the system switches off for the duration of this drop but switches back on again once the on-board electrical system has stabilized.
Characteristics when operating the ON/OFF button
The COMAND operating, display and controller unit can also be switched on by pressing the ON button (ON/OFF) when the transmitter key is removed. All media-oriented system transport (most) functions are available for t = 30 min. The system switches off automatically once this time has elapsed. If the system has switched off after 30 minutes, the system can be switched on again by pressing the ON button. The cycle (t = 30 min) starts from the beginning again.
On/Off characteristics via AUTO-ON
The COMAND operating, display and controller unit changes to the function status AUTO-ON, when it is "woken up" by a MOST participant (e.g. telephone call or SMS). In this case the function status that the system was in prior to the wake-up is stored. When the functions or user instructions that were initiated by the wake- up have completed, the system status prior to the arrival of the wake-up signal is reinstated
In AUTO-ON function mode, the COMAND operating, display and controller unit neither accepts display requests from other MOST participants nor does it wake them up. The system is either switched off using the ON button (ON/OFF) or by removing the transmitter key.
An active phone call is not interrupted by removing the transmitter key. In this case, the MOST switches itself off later.
Switch-off characteristics
The COMAND operating, display and controller unit is switched off by pressing the ON button or by removing the transmitter key "Circuit 15C OFF" from the EIS [EZS] control unit.
When the MOST is shut down, the navigation system run-on time (standby mode) of t = 30 min starts. During this period all the important locating parameters are stored. Moreover, the COMAND operating, display and controller unit and the audio gateway control unit (N93/1) are always in standby mode when CAN-B is active.
Switch off characteristics at undervoltage
The central computer of the COMAND operating, display and controller unit constantly monitors the battery voltage. Depending on the voltage value the system performs as follows.
The battery voltage is 9.5 to 11.5 V (battery warning range)
^ If the battery voltage drops below 11.5 V, a message appears in the display and requests that the engine be started.
^ If the engine is not started, then a further warning follows after t = 3 minutes that approx. 10 seconds remain for starting the engine before the device switches off. In this case, starting the engine serves to prevent the system shutting down automatically. However, if the system has switched off and the voltage rises again above 11.5 V, the COMAND operating, display and controller unit does not switch on again.
^ If a system has been shut down it can still be switched back on again manually. However, the warning procedure recurs each time anew until the fault has been rectified.
Battery voltage below 9.5 V (undervoltage)
The COMAND operating, display and controller unit is automatically put into a defined standby condition in which only the battery voltage is monitored. Additionally, the current operating condition is backed up. In this condition the system cannot be operated or made to respond via STAR DIAGNOSIS. All communication with external components is stopped.
Switch On/Off characteristics with code (889) Keyless Go
If the vehicle is started or stopped by pressing the Keyless Go switch start/stop switch (S2/3), this is identical to the switching on/ off behavior when starting up again with the transmitter key.