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

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

MODEL 203.0 /2 /7 as of 24.4.04
- with CODE (523) MB Audio 20 radio
- except CODE (494) USA version
- except CODE (498) Japan version
- up to Model Year 8

Activating the overall system
Position 0 "Key inserted"
In order to ensure a quicker switch-on process when the transmitter key is inserted (A8/1) in the EIS [EZS] control unit (N73) position 0 (circuit 15C), only the bus systems are activated for t = 3 minutes. If the radio (A2) is switched on with the ON/OFF button, it is switched off automatically after t = 30 minutes.

Position 1 "Radio position"
When the transmitter key (A8/1) is turned to position 1 (circuit 15R ON) the radio is (A2) switched on, provided it was switched on before the last time the transmitter key (A8/1) was removed. It remains in operation until the remote control key (A8/1) is removed again.

The function options are restricted to:
- Operating the radio (A2)
- Multifunction display (A1p13) in the instrument cluster (A1)
- Operation via the multifunction steering wheel

Position 2 "Ignition"
by turning the key further to position 2 (circuit 15 ON) all functions in the vehicle are rendered operational. The system which was active before it was last switched off (e.g. radio (A2)) is switched on and the corresponding basic menu is displayed.

If the radio (A2) has been switched off for longer than t = 30 min., a warning menu appears with general instructions for using the system.

Position 3 "Start engine"
In position 3 (circuit 50 ON) the engine is started. If a considerable voltage drop occurs while the engine is being started, the system switches itself off during the time of the engine start. It is switched on again after the on-board electrical system has stabilized.

System behavior when the "ON/OFF" button is pressed
The radio (A2) can be switched on by pressing the "ON/OFF" button even with "circuit 15C OFF". All media-oriented system transport (most) functions are available for t = 30 min. The system switches off automatically once this time has elapsed.

On/Off behavior with "AUTO-ON"
An incoming telephone call or SMS during the run-on time causes the Universal Portable CTEL Interface (UPCI [UHI]) control unit (N123/1) to be activated, and it sends out a wake-up pulse over the MOST.

The system components are then "woken up", and the MOST system is operational in order to provide the required functions. If a shutoff has taken place after t = 30 minutes, the system can be switched on again by pressing the "ON/OFF" button. The cycle of 30 minutes then starts from the beginning.

The system is either switched off with the "ON/OFF" button or with "circuit 15C OFF". An active phone call is not interrupted by removing the transmitter key (A8/1). In this case, the MOST system switches itself off.

Switch off characteristics
The radio (A2) is switched off with "circuit 15C OFF". It is always in "standby mode" if the Controller Area Network Bus Class B (interior) (CAN-B) is active.

Switch off characteristics at undervoltage
The control electronics of the radio (A2) constantly monitor the battery voltage. Depending on the voltage value the system will act as follows:

If the battery voltage drops below 11.5 V (battery warning range), a message appears in the display and requests that the engine be started. If the engine is not started, a further warning follows after t = 3 min. that approx.10 seconds remain for starting the engine before the device switches off. In this case switching on the engine prevents the system from being automatically shut down. If the system has shut down and the voltage reading rises again above 11.5 V, the radio (A2) will not be automatically activated.

If a system has been shut down it can be switched back on again manually. However, the warning procedure is always accomplished as long as the fault has not been eliminated.

Battery voltage below 9.5 V (undervoltage)
The radio (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. In this condition the radio (A2) cannot be operated or made to respond via the DIAGNOSIS. Communication with external components does not take place.