Comfort Displays, Function - GF54.30-P-3043GW

Model 463 

as of Model year 2013 

Function requirements, general 

• Instrument cluster (A1) activated

Comfort displays in general 

The comfort displays provide a fast overview of the information, which is not required to operate the vehicle.

The comfort display function includes the following sub-functions:

• 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 

As of 03 04 2018 (except Model 463 342): The outside temperature is detected by the outside temperature sensor (B14). The front SAM control unit (N10/6) reads in the signals of outside temperature sensor directly, calculates the outside temperature and sends this to the instrument cluster via interior CAN (CAN B), electronic ignition lock control unit (N73) and user interface

CAN (CAN HMI).

Up to 02 04 2018 or Model 463 342:

The outside temperature is defined by the resistance value of the outside temperature sensor. The SAM control unit (N10) reads-in the outside temperature sensor signal directly, uses it to calculate the outside temperature and then sends this over the interior CAN or with code E11 (Stealth lights with convoy marking) over the interior CAN, stealth lights control unit (N1) and the instrument cluster CAN (CAN IC) to the instrument cluster.

The outside temperature display is shown to match the country coding in °C or □ in the multifunction display (A1p13).

The following parameters must also be taken into account to determine a correct value of outside temperature:

• 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.

As of 03 04 2018 (except Model 463 342): 

The Electronic Stability Program control unit (N30/4) uses the wheel speeds to calculate the vehicle speed and sends the vehicle speed via the chassis FlexRay (Flex E), electronic ignition lock control unit and user interface CAN to the instrument cluster.

The CDI control unit (N3/9) (diesel engine) or the ME-SFI control unit (N3/10) (gasoline engine) sends information about the coolant temperature via the engine CAN (CAN C), the powertrain control unit (N127), the chassis FlexRay, the electronic ignition lock control unit and the user interface CAN to the instrument cluster.

Up to production date April 2nd, 2018 or Model 463.342: 

The Electronic Stability Program control unit sends information on the wheel speeds over suspension CAN 1 (CAN E1), the electronic ignition lock control unit and suspension CAN 2 (CAN E2) to the instrument cluster.

The CDI control unit (engine 642.8) or the ME-SFI control unit (engine 157, 273) sends information about the coolant temperature via chassis CAN 1, the electronic ignition lock control unit and chassis CAN 2 to the instrument cluster.

On vehicles with engine 176, the ME-SFI [ME] control unit sends information on the coolant temperature over the engine CAN (CAN C1), powertrain control unit, suspension CAN 1, electronic ignition lock control unit and suspension CAN 2 to the instrument cluster.

The coolant temperature values have an influence on the outside temperature indicator as follows:

Coolant temperature T < 60 °C 

The current outside temperature value is always shown.

Coolant temperature T > 60°C and "Engine running" or "Drive train 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 up to 45 km/h, increasing outside temperatures are shown 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 s.

As of 03 04 2018 (except Model 463 342): 

The CDI control unit or the ME-SFI control unit sends the "engine running" or "drivetrain operational" signal via the drive train CAN (CAN C1), powertrain control unit, chassis FlexRay, electronic ignition lock control unit and user interface CAN to the instrument cluster.

Up to production date April 2nd, 2018 or Model 463.342: 

The CDI control unit (engine 642.8) or MF-SFI [MF] control unit (engine 157, 273) sends the "Engine running" or "Drive train operational" signal over chassis CAN 1, the electronic ignition lock control unit and chassis CAN 2 to the instrument cluster.

On vehicles with engine 176 the MF-SFI [MF] control unit sends the "Engine running" or "Drive train operational" signal over the engine CAN, powertrain control unit, chassis CAN 1, electronic ignition lock control unit and chassis CAN 2 to the instrument cluster.

If the vehicle speed signal is faulty, rising outside temperatures are displayed in attenuated form every t = 10 minutes.

Coolant temperature T > 60°C and "Engine running" or "Drive train operational" signal is not set: 

A delay period of max. 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 s. The display range for the outside temperature lies between T = -40 and +85 °C or between T = -40 and +185 □.

The electronic ignition lock control unit sends the circuit 15 status as of production date April 3rd, 2018 (except Model 463.342) over the user interface CAN or up to production date April 2nd, 2018 or for Model 463.342 over suspension CAN 2 to the instrument cluster.

If the instrument cluster receives implausible values or none at all for the coolant temperature, the display of the outside temperature is actuated as if the coolant temperature was T > 60 °C.

Function sequence for displaying the time 

As of 03 04 2018 (except Model 463 342): 

The time is shown on the analog clock (A70/1) in the center console.

The time can be entered either manually in the system settings or it is updated automatically through the received GPS data.

The head unit (A26/17) sends information on the time over the user interface CAN, electronic ignition lock control unit and the interior CAN to the front SAM control unit. The front SAM control unit actuates the analog clock via the instrument panel LIN (LIN 1).

Up to 02 04 2018 or Model 463 342: 

The time is displayed by a digital clock in the instrument cluster.

The time is always synchronized with the COMAND controller unit (A40/3). To do so, the COMAND controller unit sends information about the time to the instrument cluster via interior CAN, electronic ignition lock control unit and chassis CAN 2.

Additional function requirements for scale illumination of instrument cluster 

• Standing lights ON (circuit 58)
• Circuit 15R ON

Function sequence for scale illumination of instrument cluster 

As of 03 04 7018 (except Model 463 347): 

The brightness is automatically adapted to the brightness conditions (day/night) when the instrument cluster is activated. The front SAM control unit sends information on the brightness of the instrument illumination via the interior CAN, electronic ignition lock control unit and user interface CAN to the instrument cluster.

In addition, the brightness of the displays in the instrument cluster can be also be adjusted using the settings in the "Display" menu.

Up to 07 04 7018 or Model 463 347: 

The scale illumination of the instrument cluster is activated by switching on the standing light or circuit 15R.

The status "Standing lights actuation active" is sent by the SAM control unit over the interior CAN or with code F11 (Stealth lights with convoy marking) over the interior CAN, stealth lights control unit and the instrument cluster CAN to the instrument cluster.

The circuit 15R ON status is sent by the electronic ignition lock control unit over chassis CAN 7 to the instrument cluster. The instrument cluster receives these signals and switches on the scale illumination.

The brightness is automatically adjusted to suit the lighting conditions in the vehicle interior by a phototransistor integrated in the instrument cluster.

The brightness can also be personalized by actuating the brightness control instrument illumination (A1r1).

If the instrument cluster is activated by opening the driver door, it simply switches on the multifunction display lighting. This switches off again after a period of t = 40 s. If an active warning is shown, this run-on time is reduced to t = 170 s.

If the surround lighting function is activated over the instrument cluster, this is automatically switched on when the vehicle is unlocked by radio or up to 31.08.7015 also by infrared. This causes "Standing lights actuation active" status to be set, which also activates scale illumination of the instrument cluster. If the driver door is then opened, the ambient illumination goes off. "Standing lights actuation active" status is canceled, and the instrument cluster deactivates the scale illumination.

	Electrical function schematic of instrument cluster, comfort display	Model 463 (except 463.347) as of Model year 2019	PE54.30-P-7056-97ZGB
		Model 463 (except 463.347) as of Model year 2013 up to Model year 2019 Model 463.347 as of Model year 2017	PE54.30-P-7056-97ZGA
	Overview of system components, instrument cluster (IC) component description		GF54.30-P-9996GW