GF54.30-P-3043G Comfort Displays, Function
GF54.30-P-3043G Comfort Displays, Function
MODEL 463.306 /336 /346 up to 31.5.12 as of Model Year 2011 /YoM 10
MODEL 463.202 /222 /236 /237 up to 31.5.12 as of Model Year 2009 /YoM 08
MODEL 463.247 /248 /249 /254 up to 31.8.08 as of Model Year 2007
Model year 07.5, modification year 07
MODEL 463.270 /271 /303 /340 /341 up to 31.5.12 as of Model Year 2007
Model year 07.5, modification year 07
1 Ambient temperature
2 Wheel speeds
3 Coolant temperature
4 Manual adjustment of time (without code (ZU8) USA version, without code (ZJ1) Japan version and without code (EU1) COMAND, APS)
5 Automatic adjustment of time (with code (ZU8) USA version, with code (ZJ1) Japan version or with code (EU1) COMAND, APS)
6 Day/night signal
A1 Instrument cluster
A40/3 COMAND operating, display and (with code (ZU8) USA version, with controller unit code (ZJ1) Japan version or with code (EU1) COMAND, APS)
B11/4 Coolant temperature sensor
B14 Outside temperature display temperature sensor
B32/1 Automatic light switch daylight sensor
L6/1 Left front rpm sensor
L6/2 Right front rpm sensor
L6/3 Left rear rpm sensor
L6/4 right rear rpm sensor
N3/9 CDI control unit (with diesel engine)
N3/10 ME-SFI [ME] control unit (with gasoline engine)
N10/1 Front signal acquisition and actuation module (SAM)
N30/4 ESP control unit
N70 Overhead control panel control unit
N80 Steering column module
N135 LIN converter
S110 Left multifunction steering wheel button group
S111 Right multifunction steering wheel button group
CAN B Interior CAN
CAN C Drive train CAN
LIN Local Interconnect Network (LIN)
Function requirements, general
^ Instrument cluster activated
Comfort displays in general
The comfort displays provide a fast overview of the information, which is not required to operate the vehicle.
The convenience display comprises the following subfunctions:
^ Outside temperature indicator function sequence
^ Time display function sequence
^ Function sequence for illumination of instrument cluster
Outside temperature indicator function sequence
The outside temperature is determined via the outside temperature indicator temperature sensor, is read in by SAM and transmitted to the instrument cluster via the interior CAN.
In order to determine a correct value of outside temperature, the following parameters must also be taken into account:
- Vehicle speed (falsification of value through airstream)
- Coolant temperature (falsification of value through radiant heat)
The wheel speeds determined by the rpm sensors are read in by the ESP control unit and transmitted to the instrument cluster via the drive train CAN.
The instrument cluster receives the values and calculates the current speed from them.
The signals from the coolant temperature sensor are read in by the ME-SFI control unit ME or by the CDI control unit and transmitted to the instrument cluster via the drive train CAN.
The display appears as follows depending on the values:
Coolant temperature T < 60 °C:
If the instrument cluster is activated, the current outside temperature value is always shown damped.
A rise in outside temperature value is permitted.
Coolant temperature T greater than or equal to 60 °C:
At speeds of v < 20 km/h (coming from higher values) the display is only changed if the measured outside temperature drops.
A rise in outside temperature value is not permitted.
At speeds between v = 20 km/h and v = 45 km/h increasing outside temperatures are displayed damped after a delay period of t = 3 minutes.
At speeds of v > 45 km/h increasing outside temperatures are displayed damped after a delay period of t = 90 s.
With varying speeds the outside temperature is displayed corresponding to the speed ranges described above.
Coolant temperature T greater than or equal to 60 °C and circuit 61 Off:
A delay period (6 times engine running time, maximum t = 1 h) prevents an apparently increased outside temperature being displayed for reason of engine waste heat. A rise in outside temperature value is not permitted during this delay period.
If the coolant temperature is T < 60 °C again the delay period is immediately canceled and rising outside temperatures are permitted.
If the instrument cluster receives implausible or no values from the coolant temperature sensor, the display of outside temperature is controlled as if the coolant temperature were T greater than or equal to 60 °C.
The display of outside temperature takes place via the outside temperature indicator (A1p4).
The display range lies between T = -40 °C and T = + 85 °C or between T = -40 °F and T = +185 °F.
If the outside temperature exceeds or drops below the display range, the final value of the display range is shown up to the maximum or minimum display value.
The display value is calculated by interrogating the outside temperature 4 times. When the outside temperature indicator is active and the CAN bus is inactive this is woken up every t = 3 min. and the 4 values of outside temperature are read in.
If a value is faulty this is replaced by the last valid value. If no valid values arrive for t = 2 s, T = +85 °C or T = +185 °F is displayed.
If valid values arrive again for t = 2 s, the outside temperature determined is displayed again.
Function sequence, time display
The time is displayed digitally via the electronic clock (A1p6). The following alternatives exist for setting the time:
^ Manual setting of time
^ Auto-adjust of time
Manual setting of time
On vehicles without code (EU1) COMAND, APS the time can only be set manually via the multifunction steering wheel button group.
The signals are read in voltage-coded by the LIN converter, converted, passed on via LIN to the steering column tube module and transmitted to the instrument cluster via the interior CAN.
Auto-adjust of time
On vehicles with code (EU1) COMAND, APS the time in the instrument cluster synchronizes automatically with COMAND. The instrument cluster receives the time from COMAND via the interior CAN.
Instrument cluster illumination function sequence
The illumination is switched on automatically when the instrument cluster is activated.
If the instrument cluster is activated by opening the driver door, the illumination switches off again after t = 30 s.
If an active warning is displayed then the run-on time extends by a further t = 2 minutes.
The brightness of the instrument illumination and the multifunction display (A1p13) is automatically adapted to the brightness conditions of the interior by an integrated phototransistor.
In addition the information from the lights-on sensor is also evaluated for the illumination of the instrument cluster. This information is read in by the overhead control panel control unit and passed on via the interior CAN.
The brightness can be readjusted corresponding to the individual requirements using the instrument illumination variable resistor (A1r1).
