GF82.60-P-0004-07FAA Audio System Switch On/Off Characteristics
GF82.60-P-0004-07FAA Audio System Switch On/Off Characteristics
MODEL 203.7
- with CODE (523) MB Audio 20 radio
MODEL 203.7 as of Model Year 09 /AEJ 08 MOPF
Function requirements
- Circuit 30
General
The switch on/off behavior is divided into the following subfunctions:
- Switch on function sequence
- Switch off function sequence
Operating instruction
The user has the following options for switching the radio (A2) on and off:
- Actuation of the "ON/OFF" button on the radio
- Inserting and turning the transmitter key (A8/1) in the EIS [EZS] control unit (N73) or removing the transmitter key from the EIS [EZS] control unit
Switch on function requirements
- Radio is switched off
Switch on function sequence
Switching on includes the following subfunctions:
- Switching on function sequence via "ON/OFF" button
- Function sequence for position 0 "Key in ignition"
- Function sequence for position 1 "Radio position"
- Function sequence for position 2 "Ignition"
- Function sequence for position 3 "Engine start"
- Switching on function sequence via "AUTO-ON", with code (386) Mobile phone
Switching on function requirements via "ON/OFF" button
- Circuit 15C OFF
Switching on function sequence via "ON/OFF" button
When the "ON/OFF" on the radio is operated, the radio is switched on. The signal is processed internally in the radio. All media-oriented system transport (most) functions are available for t = 30 min.
The radio switches off automatically once this time has elapsed.
Function requirements for position 0 "Key in ignition"
- Circuit 15C ON
Function sequence for position 0 "Key in ignition"
The circuit status is transmitted by the EIS [EZS] control unit to the interior CAN. The data buses are activated for t = 3 min to ensure a quicker switch-on process.
If the radio is switched on with the "ON/OFF" button, the radio switches off automatically after t = 30 min.
Function requirements for position 1 "Radio position"
- Circuit 15R ON
- Radio was switched on before the transmitter key was last removed
Function sequence for position 1 "Radio position"
As soon as the transmitter key is in position 1 (circuit 15R ON), the radio is switched on. The circuit status travels from the EIS [EZS] control unit to the radio via the interior CAN. The radio remains in operation until the transmitter key is removed again. The function options are restricted to:
- Operation of the radio
- Multifunction display (A1p13) in the instrument cluster (A1)
- Operation via multifunction steering wheel (MFL)
Function requirements for position 2 "Ignition"
- Circuit 15 ON
Function sequence for position 2 "Ignition"
The circuit status travels from the EIS [EZS] control unit to the radio via the interior CAN.
When the transmitter key (circuit 15 ON) is in position 2, all the functions in the vehicle are operational. 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 has been switched off for longer than t = 30 minutes, a warning menu appears with general instructions for using the system.
Function requirements for position 3 "Engine start"
- Circuit 50 ON
Function sequence for position 3 "Engine start"
The circuit status travels from the EIS [EZS] control unit to the radio via the interior CAN.
When the transmitter key is in position 3 (circuit 50 ON), the engine is started. If a considerable voltage drop occurs while the engine is being started, the radio switches itself off for the duration of the engine start; however, it switches itself on again after the on-board electrical system has stabilized.
Function requirements for switching on via "AUTO-ON", with code (386) Mobile phone
- Circuit 15C OFF
- Run-on time is running
Switching on function sequence via "AUTO-ON", with code (386) Mobile phone
In vehicles except code (228) Stationary heater, the Universal Portable Cell Phone Interface (UPCI [UHI]) control unit (N123/1) receives an incoming telephone call or an SMS, in the following way:
- Telephone antenna (A2/49a1)
- Direct line
- E-net compensator (A28/3)
- Direct line
- UPCI [UHI] cell phone holder (Universal Portable Cell Phone Interface) (A34/15) with inserted cell phone
- Direct line
In vehicles with code (228) Stationary heater the signal initially travels from the telephone antenna via a direct line to the telephone/cell phone/STH radio remote control antenna splitter (A2/53) and from there via a direct line to the E-net compensator.
The Universal Portable Cell Phone Interface (UPCI [UHI]) control unit is activated and initiates a wake-up pulse via the MOST. The system components are then "woken up", the MOST system is operational in order to provide the required functions.
If the automatic shut-off has taken place after t = 30 min, the system can be switched on again by operating the "ON/OFF" button. The cycle of t = 30 min then starts from the beginning.
Function requirements for switching off
- Radio is switched on
Switch off function sequence
Switching off is divided into the following subfunctions:
- Function sequence for switching off via "ON/OFF" button
- Function sequence for switching off for position 3 "Engine start"
- Function sequence for switching off for position 2 "Ignition" or position 1 "Radio position"
- Function sequence for switching off for position 0 "Transmitter key is inserted"
- Function sequence for switching off by removing the transmitter key
- Function sequence for switching off after switching on with status "Circuit 15C OFF"
- Function sequence for switching off after activation via "AUTO-ON"
- Function sequence for switching off in the event of undervoltage
Function sequence for switching off via "ON/OFF" button
When the "ON/OFF" on the radio is pressed, the radio is switched off. The signal is processed internally in the radio.
Function requirements for switch off for position 3 "Engine start"
- Circuit 50 ON
Function sequence for switching off for position 3 "Engine start"
The circuit status travels from the EIS [EZS] control unit to the radio via the interior CAN.
When the transmitter key is in position 3 (circuit 50 ON), the engine is started. If a considerable voltage drop occurs while the engine is being started, the radio switches itself off for the duration of the engine start; however, it switches itself on again after the on-board electrical system has stabilized.
Function requirements for switching off for position 2 "Ignition" and position 1 "Radio position"
- Circuit 15 ON or circuit 15R ON
Function sequence for switching off for position 2 "Ignition" or position 1 "Radio position"
The particular circuit status travels from the EIS [EZS] control unit to the radio via the interior CAN.
The radio can only be switched off via the ON/OFF button on the radio. The signal is processed internally in the radio.
Function requirements for position 0 "Transmitter key inserted"
- Circuit 15C ON
Function sequence for position 0 "Transmitter key inserted"
The circuit status is transmitted by the EIS [EZS] control unit to the interior CAN. The system is switched off with the "ON/OFF" button on the radio or automatically t = 30 min after it has been switched on.
Function requirements for switching off by removing the transmitter key
- Circuit 15C ON
Function sequence for switching off by removing the transmitter key
- The transmitter key can be removed in position 0 (circuit 15 C ON).
- The circuit status changes to 15C OFF.
- The circuit status is transmitted by the EIS [EZS] control unit to the interior CAN.
- The radio switches itself off automatically.
Function requirements for switching off after switching on with status "Circuit 15C OFF"
- Circuit 15C OFF
Function sequence for switching off after switching on with AUTO-status "Circuit 15C OFF"
The circuit status is transmitted by the EIS [EZS] control unit to the interior CAN. The ON/OFF button is used to manually switch off the radio, and t = 30 min after it has been switched on, the radio is switched off automatically.
The radio is always in "Stand-by" mode when the interior CAN is active.
Function requirements for switching off after activation via "AUTO-ON"
- Activation via "AUTO-ON"
Function sequence for switching off after activation via "AUTO ON"
The system is either switched off via the "ON/OFF" button or with "Circuit 15C OFF". An active phone call is not interrupted by removing the transmitter key. In this case, the MOST system switches itself off.
Function requirements for switching off in the event of undervoltage
- Battery voltage < 11.5 V or < 9.5 V
Function sequence for switching off in the event of undervoltage
The control electronics in the radio continuously monitor the battery voltage. Depending on the voltage value the system behaves as follows:
- Battery voltage function sequence < 11.5 V and > 9.5 V
- Battery voltage function sequence < 9.5 V
Battery voltage function sequence < 11.5 V and > 9.5 V
- A message appears on the display and prompts the driver to start the engine.
- 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, starting the engine serves to prevent the system from shutting down automatically.
- If the engine is not started, the system switches itself off automatically.
If the voltage increases again to above 11.5 V, the radio does not switch itself on automatically.
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 function sequence < 9.5 V
The radio is automatically put in a defined standby condition, in which only the battery voltage is monitored. Additionally, the current operating condition is backed up.
In this condition the radio cannot be operated or made to respond via STAR DIAGNOSIS. All communication with external components is stopped.