GF82.85-P-2006TB Switch On/Off Behavior, Function

GF82.85-P-2006TB Switch On/Off Behavior, Function

ON/OFF characteristics
Activating the overall system
Position 1
By inserting the transmitter key (A8/1) in the electronic ignition switch control module (N73) position circuit 15C only the bus systems are activated for = 3 minutes in order to ensure a quicker switch-on process.
If the radio operating module (A2) is switched on with the ON- button (on/off), switching off follows automatically after 30 minutes.

Position 2
By turning the transmitter key (A8/1) onto "circuit 1 ON 15R" the unit is switched on, provided that it was switched on before the last time the transmitter key was removed. It remains in operation until the transmitter key is removed again.

The function options are limited to:
^ Operation of the radio control panel (A2)
^ Multifunction display in instrument cluster
^ 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.
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 radio operating module (A2) was switched off for longer than 30 minutes, a warning menu appears with general instructions on using the system.

Position 4
If a considerable voltage drop occurs while starting the engine, the system switches itself off for this period, however switches itself on again after stabilization of the on-board electrical system.

Behavior when On/Off button is pressed
When the transmitter key is removed, the radio operating module (A2) can also be switched on (A8/1) by pressing the ON button (On/Off) on the rotary switch. All MOST functions are then available for 30 minutes. The system switches off automatically after this time has elapsed.
If the system has switched off after 30 minutes, the system can be switched back on again by pressing the ON button. The 30-minute cycle then starts again from the beginning.

Switch On/Off behavior via AUTO-ON
During the run-on time, the telecommunications control module (N112) or telephone interface (A34/4) is activated due to an incoming telephone call or an SMS and initiates a wake pulse via MOST.

The system components are "woken up"; the MOST system is operational in order to make available the necessary functions.

Switching off occurs either via the ON button (On/Off) or by removing the transmitter key (A8/1).
An active telephone conversation is not interrupted by removing the transmitter key (A8/1). In this case, the MOST system switches itself off.

Switch off characteristics
The radio control panel (A2) is switched off when removing the transmitter key (A8/1) (circuit 15C, OFF) from the electronic ignition switch control module (N73).
The radio control panel (A2) and the audio gateway control module (N93/1) are always in "Stand-By mode" when the interior compartment CAN is active.

Switch off characteristics at undervoltage
The control electronics of the radio operating module (A2) constantly monitors the battery voltage. Depending on the voltage value the system will act as follows:
^ Battery voltage is 9.5 to 11.5 V (warning range):
If the battery voltage drops below 11.5 V, a message appears in the display and requests the engine be started
^ If the engine is not started, then a further warning follows after 3 minutes, that there are approximately still 10 seconds remaining for starting the engine, before the unit switches off.

In this case switching on the engine prevents the system from being automatically shut down. If the system has switched off and the voltage rises above 11.5 V again, the Audio 20 CC does not automatically switch on again.

^ If a system has been shut down it can be switched back on again manually. However the warning procedure takes place every time again as long as the fault is not rectified

Battery voltage below 9.5 V (undervoltage):
^ The radio control panel (A2) is automatically put in a defined standby condition, in which only the battery voltage is monitored. In addition to this the current operating status is stored. Audio 20 CC cannot be operated in this status, nor is it accessible via the STAR Diagnosis tool. No further communication takes place with external components