Comfort Displays, Function - GF54.30-P-3043RR
Model 190
Function requirements in general
- Instrument cluster (A1) activated
Comfort displays in general
The comfort displays provide a quick overview of the following information:
- Function sequence for displaying outside temperature
- Function sequence for displaying the time
- Function sequence for scale illumination of instrument cluster
Function sequence for displaying outside temperature
The outside temperature is detected by the outside temperature sensor (B14).
The front SAM control unit with fuse and relay module (N10/1) reads in the signals from the outside temperature sensor directly, calculates the outside temperature and sends this to the instrument cluster via the interior CAN (CAN B), the AMG gateway control unit (N93/9) and the user interface CAN (CAN HMI). The outside temperature is displayed in the multifunction display (A1p13) of the instrument cluster in °C or °F, in accordance with the country coding.
The following parameters must be considered in addition so that the actual outside temperature is displayed:
- Vehicle speed (falsification of value through air stream)
- Coolant temperature (falsification of value through radiant heat)
The vehicle speed is calculated on the basis of the wheel speeds.
The Electronic Stability Program control unit (N30/4) sends information about the wheel speeds via chassis CAN 1 (CAN E1), the AMG gateway control unit and the user interface CAN to the instrument cluster.
The ME-SFI control unit (N3/10) sends information about the coolant temperature via the engine CAN (CAN C), the powertrain control unit (N127), chassis CAN 1, the AMG gateway control unit and the user interface CAN to the instrument cluster.
The coolant temperature values exert the following influence on the outside temperature display:
- Coolant temperature T < 60°C:
The current outside temperature value is always shown.
- Coolant temperature T > 60°C and "Engine running" or "Drivetrain operational" signal is set:
At vehicle speeds of v < 20 km/h (with vehicle deceleration), the outside temperature display is only changed if the measured outside temperature value drops. At vehicle speeds of v = 20 to 45 km/h, rising outside temperatures are displayed after a delay period of t = 3 minutes.
At vehicle speeds of v > 45 km/h, rising outside temperatures are displayed after a delay period of t = 90 seconds.
The ME-SFI control unit sends the "engine running" or "drivetrain operational" signal via the drive train CAN (CAN C1), the powertrain control unit, chassis CAN 1, the AMG gateway control unit and the user interface CAN to the instrument cluster.
If the vehicle speed signal is faulty, rising outside temperatures are shown in an attenuated manner every t = 10 minutes.
- Coolant temperature T > 60°C and "Engine running" or "Drivetrain operational" signal is not set:
A delay period of maximum t = 1 h prevents an apparent increase in outside temperature from being displayed that is caused by heat dissipated from the engine. A rise in display value is not permitted during this delay period. With circuit 15 OFF, the last measured outside temperature value is stored and then displayed when the circuit is reactivated.
If, in the meantime, the measured outside temperature has dropped below the stored value, the currently measured temperature is displayed after t = 8 seconds. The display range for the outside temperature lies between T = -40 and +85°C or between T = -40 and +185°F.
f the instrument cluster receives implausible values or none at all for the coolant temperature, the display of the outside temperature is regulated as if the coolant temperature was T > 60_°C.
Function sequence for displaying the time
The time is displayed in the multifunction display of the instrument cluster.
The time is always synchronized with the head unit (A26/17). The head unit sends the signal for time synchronization to the instrument cluster via the user interface CAN. The instrument cluster sends the signal for time synchronization back to the head unit.
Function sequence for scale illumination of instrument cluster
The scale illumination is switched on when the instrument cluster is activated. The brightness is automatically adapted to the ambient brightness (day/night) by the instrument cluster.
When it is dark, the brightness can also be adjusted in the "Lights" submenu in the "Settings" menu. The instrument cluster regulates the brightness of all display elements accordingly.
| Electrical function schematic of instrument cluster, comfort display | PE54.30-P-2056-97HBA | ||
| Overview of system components, instrument cluster (IC) component description | GF54.30-P-9996RR |