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

MODEL 166 up to model year 2016 

Function requirements, general 

IMPORTANT The electronic ignition lock control unit (N73) sends the status of circuit 15 over 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:

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:

The trip computer comprises the following subfunctions:

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 "After start" travel distance is displayed in a range from 0 to 9999 km.

IMPORTANT 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".

IMPORTANT If the value for travel distance 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 can be changed in the "Setup" 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 "After reset" travel distance is calculated in the same way as the "After start" travel distance, apart from the fact that the travel distance is displayed in a range of 0 to 99, 999 km.

Depending on the setting in the instrument cluster or the coded national version, the travel distance is shown in:

IMPORTANT When converting from kilometers to miles a change is automatically made 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 time is displayed within a range of 0 to 999 h and 59 min.

The time "After reset" is determined in line with determining the time "After start", though here the time is displayed 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 coded national version, the average speed is shown in:

Function sequence for display of average mileage and present consumption (except model 166.074/874) and regenerative braking (as of 01.06.2014) (battery charging in deceleration mode) 

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

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

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 166.074/874) and regenerative braking (as of 01.06.2014) are displayed together with the remaining distance in the form of a bar display.

Function sequence for display of ECO Score (driving style analysis) (as of 01.07.2012 except model 166.074/874) 

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

The following information is displayed:

The CDI control unit or the ME-SFI [ME] control unit sends the data required for evaluation purposes over chassis CAN 1, electronic ignition lock control unit and chassis CAN 2 to the instrument cluster.

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 fill level sensor directly, and sends this 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). Only the information currently displayed is reset.

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.

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