Trip Computer, Function - GF54.30-P-3044RR

Model 190 

Function requirements in general 

• Tml. 15 ON:

  The electronic ignition lock control unit (N73) transmits the circuit status of circuit 15 via the suspension CAN 1 (CAN E1), the AMG Gateway control unit (N93/9) and the user interface CAN (CAN HMI) to the instrument cluster (A1).

Trip computer (TRIP) function, general 

The trip computer provides data and information on average fuel consumption, trip time, average speed, travel distance and remaining range.

The trip computer provides the following display screens:

• "After start" (short-distance memory)
• "After reset" (long-distance memory)

The information displayed refers to the point in time of the last reset of the shortdistance memory ("After start") or of the long-distance memory ("After reset").

The "After start" or "After reset" information is shown in the multifunction display (A1p13) of the instrument cluster as follows:

• Distance traveled
• Time elapsed
• Average consumption
• Average transportation speed

The trip computer comprises the following subfunctions:

• Function sequence, travel distance display after start/after reset 
• Function sequence, time display after start/after reset 
• Function sequence for the average speed display 
• Function sequence for display of present consumption and composite mileage 
• Function sequence for remaining distance display 
• Function sequence for display reset 

Function sequence, travel distance display after start/after reset 

The travel distance 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 instrument cluster calculates the traveled distance from the wheel speeds. The travel distance "After start" is displayed in the range from 0 to 9999 km.

If a period of more than t = 4 h lies between the time when circuit 15 is switched off and then switched on again, then the "After start" odometer is automatically reset to 0.

If the unit is changed at a distance value between 6213 and 9999 (e. g. from km to miles), the odometer will reset to "0" automatically. This reset remains active even if the unit is changed again. Distance units are changed in the "settings" menu in the "instrument cluster" submenu. The distance unit can be changed from "km" to "miles" in the "Speedometer/travel distance display unit" display window.

The travel distance "After reset" is calculated similar to the travel distance "After start"; however, the display here is in the range from 0 to 99, 999 km.

Depending on the setting in the instrument cluster and coding of the national version of the instrument cluster, the travel distance is displayed in:

• Kilometers, (e.g Economic Commission for Europe (ECE), Japan)
• Miles, (e.g. USA, Australia)

Switching over from kilometers to miles causes an automatic switchover from liters to gallons.

Function sequence, time display after start/after reset 

With circuit 15 ON, the time after start is added up by means of a time counter. The display is realized in the range from 0 to 999 h and 59 min.

The time "After reset" is determined similar to the time "After start"; however, the display here is in the range from 0 to 9999 h and 59 min.

Function sequence for the average speed display 

The trip computer calculates the average speed from the ratio between the travel distance driven and the time passed (trip time) since the last reset of the shortdistance memory or long-distance memory. The travel distance is calculated in the instrument cluster from the wheel speeds.

Depending on the setting (kilometers/miles) and the national variant coding of the instrument cluster the average speed is displayed in:

• km/h (kilometers per hour)
• mph (miles per hour)

Function sequence for display of present consumption and composite mileage 

The trip computer calculates the fuel consumption using the following information:

• Average consumption
• Travel distance covered "After start" or "After reset"

Depending on the setting (kilometers/miles) and the national variant coding of the instrument cluster the fuel consumption is displayed in:

• l/100 km (Liters per 100 kilometers)
• mpg (miles per gallon) or
• km/l (kilometers per liter)

The ME-SFI control unit (N3/10) sends information about the fuel consumption 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 present consumption is displayed together with the range. The displays are shown in the form of a bar display.

Function sequence for remaining distance display 

The trip computer determines the expected range from the ratio between the current tank capacity and the average fuel consumption.

The fill level of the fuel tank is acquired by the fuel tank fuel level indicator fill level sensor, left (B4/1).

The fuel system control unit (N118) reads in the signals from the fuel tank fill level sensor directly and sends information about the fill level of the fuel tank 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.

Function sequence for display reset 

As of 01.12.2018: 

The displayed values can be reset to "0" in the "Reset values" menu by pressing on the instrument cluster finger navigation pad (S163/1s10) in the instrument cluster multifunction steering wheel button group (S163/1). The reset is only carried out for the currently displayed information (After start/reset).

The request is read in by the steering wheel electronics (N135) and transmitted via the steering wheel CAN (CAN LR) to the steering column tube module control unit (N80). The steering column tube module control unit transmits this request to the instrument cluster via the AMG FlexRay, the AMG Gateway control unit and the user interface CAN.

Up to 30.11.2018: 

The TRIP computer is reset in the "Reset values" menu by pressing the OK button. (S110s6) in the left multifunction steering wheel button group (S110). Only the information currently displayed is reset.

The steering wheel electronics reads in the status of the O. K. button directly and sends this to the steering column tube module control unit via the steering LIN (LIN E1). The steering column tube module control unit sends the status of the OK button via chassis CAN 1, the AMG gateway control unit and the user interface CAN to the instrument cluster.

	Electrical function schematic, instrument cluster trip computer		PE54.30-P-2057-97HBA
	Overview of system components, instrument cluster (IC) component description		GF54.30-P-9996RR