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

MODEL 166 as of model year 2016

MODEL 292

Function requirements, general

Circuit 15 ON

The electronic ignition lock control unit (N73) transmits the status of circuit 15 via chassis CAN 2 (CAN E2) 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)
"Present consumption"

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 display of composite mileage and present consumption (except model 166.064/074/075/874 or except 292.374/375) and regenerative braking
Function sequence for display of ECO Score (driving style analysis) (except model 166.064/074/075/874 or except 292.374/375)
Function sequence for remaining distance display
Function sequence for display reset
Function sequence for power flow display (with CODE ME05 (HYBRID DRIVE 80KW VARIANT (INCLUDING PLUG-IN)))

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) transmits information about the wheel speeds via chassis CAN 1 (CAN E1), electronic ignition lock control unit and chassis CAN 2 to the instrument cluster. 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 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 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 0. 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 unit can be changed from km to mi (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 or the coded national version, the travel distance is shown in:

Kilometers (e.g. Economic Commission for Europe (ECE), Japan (except model 292))
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 analog to the determination of time after start, although here the display takes place in a range of 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 instrument cluster calculates the travel distance based on the wheel speeds.

Depending on the setting (kilometers/miles) and the coded national version, the average speed is shown in:

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

Function sequence for display of composite mileage and present consumption (except model 166.064/074/075/874 or except 292.374/375) and regenerative braking

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 [ME] control unit sends the relevant information about coolant temperature over chassis CAN 1, electronic ignition lock control unit and chassis CAN 2 to the instrument cluster.

The present consumption (except model 166.064/074/075/874 or except 292.374/375) and regenerative braking are displayed together with the range. The displays are shown in the form of a bar display.

Function sequence for display of ECO Score (driving style analysis) (except model 166.064/074/075/874 or except 292.374/375)

The individual handling characteristics are graphically displayed in the "ECO-Score" display.

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 (except CODE (HYBRID DRIVE 80KW VARIANT (INCLUDING PLUG-IN))) or the ME-SFI [ME]control unit transmits the data that is required for evaluation to the instrument cluster via the following route: chassis CAN 1, electronic ignition lock control unit and chassis CAN 2.

Vehicles with CODE (HYBRID DRIVE 80KW VARIANT (INCLUDING PLUG-IN)):
- Chassis CAN 1
- Electronic ignition switch control unit
- Chassis CAN 2
Vehicles except CODE (HYBRID DRIVE 80KW VARIANT (INCLUDING PLUG-IN)):
- Hybrid CAN
- Drivetrain control unit

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 capacity is recorded by the left fuel tank fuel level indicator fill level sensor (B4/1) and the right fuel tank fuel level indicator fill level sensor (B4/2). The SAM control unit (N10) reads in the signals of the fuel tank fuel level sensors and sends them over the interior CAN (CAN B) to the instrument cluster. The average fuel consumption is gathered from 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 steering wheel electronics (N135) read in the status of the OK button directly and transmit it to the steering LIN (LIN E1) to the steering column tube module control unit (N80). The steering column tube module control unit sends the status of the OK button over chassis CAN 1, electronic ignition lock control unit and chassis CAN 2 to the instrument cluster.

Function sequence for power flow display with CODE ME05 (HYBRID DRIVE 80KW VARIANT (INCLUDING PLUG-IN))

Fig 1: Function Sequence For Power Flow Display With Code ME05 (Hybrid Drive 80KW Variant (Including Plug-In))

Courtesy of MERCEDES-BENZ USA

The power flow display in the multifunction display indicates whether the high-voltage battery (A100g1) is charging or delivering energy.

The battery management system control unit (N82/2) transmits the high-voltage battery data that is required for the display to the instrument cluster via the hybrid CAN (CAN L), the powertrain control unit (N127) chassis CAN 1, the electronic ignition lock control unit and the interior CAN.

Electrical function schematic, instrument cluster trip computer	PE54.30-P-2057-97NBA
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