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

MODEL 212 

Function requirements, general 

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

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 includes 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 wheel speeds are recorded by the following components:

The Electronic Stability Program control unit (N30/4) (model 212 (except 212.074/075/076/077/092/095/098/274/275/276/277/292/298) except CODE 233 (DISTRONIC PLUS)) or the regenerative braking system control unit (N30/6) (model 212.095/098/298) or the Premium Electronic Stability Program control unit (N30/7) (model 212 (except 212.095/098/298) with CODE 233 (DISTRONIC PLUS), model 212.074/075/076/077/092/274/275/276/277/292) reads in the signals from the rpm sensors directly and sends them to the instrument cluster up to 28.02.2013 via the chassis CAN (CAN E) or as of 01.03.2013 via chassis CAN 1 (CAN E1), the front SAM control unit with fuse and relay module (N10/1) and chassis CAN 2 (CAN E2).

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.

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 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 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 analog to calculating 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:

IMPORTANT When changing over from kilometers to miles a changeover from liters to gallons takes place automatically.

On model 212.041, the travel distance is also displayed as of the start/reset for natural gas operation.

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 shown in a range from 0 to 999 h and 59 min. The "After reset" time is determined in the same way as the "After start" time (the display here however, 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 using the wheel speeds or, with new engine generations, by the CDI control unit (N3/9) (diesel engine) or by the ME-SFI control unit (N3/10) (gasoline engine). Depending on the setting (kilometers/miles) and the national variant coding of the instrument cluster the average speed is displayed in:

Function sequence for display of present consumption (except model 212.074/075/076/077/092/274/275/276/277/292) and composite mileage 

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

The CDI control unit or the ME-SFI control unit sends the relevant information to the instrument cluster up to 28.02.2013 via the chassis

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

CAN or as of 01.03.2013 via chassis CAN 1, the front SAM control unit and chassis CAN 2.

On vehicles with engine 274.9 and CODE 924 (Bivalent natural gas drive), the composite mileage is additionally shown in kg/100 km (kilograms per 100 kilometers).

For this purpose, the CNG control unit (N118/2) sends corresponding information to the ME-SFI control unit up to 28.02.2013 via the drive train CAN (CAN C) or as of 01.03.2013 via the drive train sensor CAN (CAN I). The ME-SFI control unit sends this information to the instrument cluster up to 28.02.2013 via the chassis CAN or as of 01.03.2013 via chassis CAN 1, the front SAM control unit and chassis CAN 2.

IMPORTANT The present consumption is shown together with the range. The display is shown in the form of a bar display.

Function sequence for "ECO Score" (driving style analysis) display (as of 01.06.2012 except model 212.074/075/076/077/092/095/098/274/275/276/277/292/298, except engine 271, 272, 642 with CODE M014 (Uprated engine), except engine 651 except 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:

The CDI control unit or the ME-SFI control unit sends the data required for the evaluation to the instrument cluster up to 28.02.2013 via the chassis CAN or as of 01.03.2013 via chassis CAN 1, the front SAM control unit and chassis CAN 2.

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 signals from the fuel level indicator sensor directly and sends them via the interior CAN to the instrument cluster.

The average fuel consumption is gathered from the short-distance memory or long-distance memory.

On vehicles with engine 274.9 and CODE 924 (Bivalent natural gas drive), the expected range for operation in natural gas mode is also shown.

If the fuel tank only has a little fuel in it, the current operating mode shows a "fueling vehicle" instead of the approximate range.

For this purpose, the CNG control unit sends corresponding information to the ME-SFI control unit up to 28.02.2013 via the drive train CAN or as of 01.03.2013 via the drive train sensor CAN. The ME-SFI control unit forwards this information to the instrument cluster up to 28.02.2013 via the chassis CAN or as of 01.03.2013 via chassis CAN 1, the front SAM control unit and chassis CAN 2.

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 selection is read in directly 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 up to 28.02.2013 via the chassis CAN or as of 01.03.2013 via chassis CAN 1, the front SAM control unit and chassis CAN 2.

IMPORTANT When resetting to After start the ECO-Score display is also reset.

Function sequence for power flow display (model 212.095/098/298) 

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

The high-voltage battery data required for the display is sent by the battery management system control unit (N82/2) to the instrument cluster via the hybrid CAN (CAN L), CDI control unit or ME-SFI control unit and up to 28.02.2013 via the chassis CAN or as of 01.03.2013 via chassis CAN 1, the front SAM control unit and chassis CAN 2.

Fig 1: Identifying Power Flow Display - Shown On Model 212.095
G10050369Courtesy of MERCEDES-BENZ USA
  Electrical function schematic, instrument cluster trip computer MODEL 212 up to model year 2014 PE54.30-P-2057-97DAA
MODEL 212 as of model year 2014 PE54.30-P-2057-97DAB
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