Trip computer, function - GF54.30-P-3044CA

MODEL 207.3/4 

Function requirements, general 

• Terminal 15 ON

The electronic ignition lock control unit (N73) transmits the circuit status of circuit 15 via interior CAN (CAN B) 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 short-distance memory ("After start") or of the long-distance memory ("After reset").

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

• "Traveled distance"
• "Time elapsed"
• "Average consumption"
• "Average transportation speed"

The TRIP computer includes 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 composite mileage display 
• Function sequence for ECO Score (driving style analysis) display (as of 01.06.2012 except engine 276, 278, 642 with CODE M014 (Uprated engine), except engine 651 without CODE B03 (ECO start/stop function)) 
• 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 wheel speeds are recorded by the following components:

• Left front axle RPM sensor (L6/1)
• Right front axle RPM sensor (L6/2)
• Left rear axle RPM sensor (L6/3)
• Right rear axle RPM sensor (L6/4)

The Electronic Stability Program control unit (N30/4) (without CODE 233 (DISTRONIC PLUS)) or the Premium Electronic Stability Program control unit (N30/7) (with CODE 233 (DISTRONIC PLUS)) reads in the signals from the RPM sensors and sends them to the instrument cluster via the chassis CAN (CAN E) up to 31.05.2013 or to the instrument cluster via chassis CAN 1 (CAN E1), the front SAM control unit with fuse and relay module (N10/1) and chassis CAN 2 (CAN E2) as of 01.06.2013. The instrument cluster calculates the traveled distance from the wheel speeds. The travel distance "After start" is displayed in a range of 0 to 9999 km.

If more than t = 4 h lie between circuit 15 OFF and reactivation, the "After start" odometer is reset to zero automatically.

If the odometer reading is between 6213 and 9999 and the distance unit is changed (e.g. from km to miles), the odometer will automatically be reset to zero. 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 kilometers to miles in the "Speedometer/travel distance display unit" display window.

The travel distance "After reset" is calculated in the same way as the travel distance "After start", though here the display takes place in a 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)

When kilometers are switched over to miles, liters are switched over to gallons automatically.

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 ranges from 0 to 999 h and 59 min. The time after reset is determined in the same way as the time after start is determined. Here, the display ranges 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 short-distance 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 composite mileage display 

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

• Consumption signal from CDI control unit (N3/9) (with diesel engine) or from ME-SFI control unit (N3/10) (with gasoline engine)
• Travel distance covered "After start" or "After reset"

Depending on the setting (kilometers/miles) and the coding of the national version 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 CDI control unit or the ME-SFI control unit sends the relevant information to the instrument cluster via the chassis CAN up to 31.05.2013 or to the instrument cluster via chassis CAN 1, the front SAM control unit and chassis CAN 2 as of 01.06.2013.

Function sequence for ECO Score (driving style analysis) display (as of 01.06.2012 except engine 276, 278, 642 with CODE M014 (Uprated engine), except engine 651 without CODE B03 (ECO start/stop function)) 

The "ECO Score" display graphically displays the individual handling characteristics in the form of a bar graph.

The following information is displayed:

• Acceleration characteristic
• Constant driving and coasting
• The mean value of the three disciplines yields the overall score

The CDI control unit or the ME-SFI control unit sends the data required for the evaluation to the instrument cluster via the chassis CAN up to 31.05.2013 or to the instrument cluster via chassis CAN 1, the front SAM control unit and chassis CAN 2 as of 01.06.2013.

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 current tank fill level is detected by the left fuel level indicator sensor (B4/1) and right fuel level indicator sensor (B4/2). The rear SAM control unit with fuse and relay module (N10/2) reads in the fuel level indicator sensor signals and sends them via interior CAN to the instrument cluster. The average fuel consumption is taken from the data in the short-distance memory or long-distance memory.

Function sequence for display reset 

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). Here, the reset is only carried out for the currently displayed information. The corresponding actuation is read in by the steering wheel electronics (N135) and is sent via the steering LIN (LIN E1) to the steering column tube module control unit (N80). The steering column tube module control unit sends the signals to the instrument cluster via the chassis CAN up to 31.05.2013 or to the instrument cluster via chassis CAN 1, the front SAM control unit and chassis CAN 2 as of 01.06.2013.

	Electrical function schematic, instrument cluster trip computer	MODEL 207.3/4 up to model year 2014	PE54.30-P-2057-97EAA
		MODEL 207.3/4 as of model year 2014	PE54.30-P-2057-97EAB
	Overview of system components, instrument cluster (IC) component description		GF54.30-P-9996CA