Display operating conditions, function - GF54.30-P-3041MCU

MODEL 451.3/4

Shown on code (K07) Speedometer (miles)

Fig 1: Identifying Indicator Displays

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Gear indicator in manual mode

The gear indicator displays the current gear engaged.

The corresponding information from the automated manual transmission control unit (N15/6) is read in over the Controller Area Network (data bus/CAN bus) (CAN) from the instrument cluster. If the automated manual transmission control unit establishes that a higher gear would be better for the current engine speed, accelerator pedal position and vehicle speed, a gear change is suggested in the gear indicator:

Arrow up: Shift up one gear
Arrow down: Shift down one gear

The gearshift recommendation is oriented towards a consumption-specific driving style.

Gear indicator in automatic mode

The selected driving stage is shown in the gear indicator.

The following displays are possible:

"P": Parking position
"R": Reverse gear
"N": Neutral
"D": Drive position

The corresponding information from the automated manual transmission control unit is read in over CAN by the instrument cluster.

Fuel level and reserve indicator

The fuel supply is shown to the driver over the fuel level and reserve indicator by means of eight segments.

The data sent from the fuel level sensor (M3/3b1) to the ME-SFI [ME] control unit (N3/10) is read in over the CAN by the instrument cluster.

The reserve area is equivalent to an amount of 1 gal.

If the reserve area is reached, the fuel pump symbol starts to flash on and off and the remaining fuel is displayed in increments of 0.13 gal in the multifunction display.

In the event of any malfunction the segments in the fuel level and reserve indicator start to flash on and off.

Maintenance interval display

The maintenance interval display draws the driver's attention to a service that is due soon. Roughly one month beforehand and every time the engine is started, the maintenance interval display is displayed for 10 seconds, and the line of the main odometer shows the remaining distance or remaining time.

Meaning of maintenance interval displays:

One wrench = Oil service plus
Two wrenches = Maintenance

The left button on the instrument cluster can be used to confirm the display on the maintenance interval display.

The maintenance interval display is shown for 10 s by briefly pressing the button in the right of the instrument cluster twice.

Trip odometer

The display area for the trip odometer is 0 to 9999.9 kilometers or miles (with code (K07) Speedometer (miles)). Once the maximum reading is reached the display is automatically reset to zero.

Manual reset:

Keep pressing the left button until the trip odometer appears in the multifunction display. After pressing the left button again for 1 s the display starts to flash on and off. Continue to press and hold the left button. The display is reset to zero.

The trip distance remains stored even when the battery (G1) is disconnected.

Odometer

The main odometer reading is shown either in kilometers or miles, as soon as the instrument cluster is activated.

The range for the main odometer is from 0 to 999,999 kilometers or miles. If the maximum mileage is reached, the counter is not reset to zero.

In this case, the instrument cluster should be replaced. The internal counter continues to operate however.

The main odometer reading is stored for at least 10 years, even if the voltage supply is disconnected.

Outside temperature indicator

The instrument cluster takes the following data into consideration when determining the outside temperature value:

Outside temperature value directly from outside temperature display temperature sensor (B14)
Internal vehicle speed signal from instrument cluster
Coolant temperature value via CAN from the ME-SFI [ME] control unit
Engine running time over CAN from ME-SFI [ME] control unit

The instrument cluster processes this data and actuates the outside temperature indicator accordingly.

The dependency of the outside temperature indicator on the speed, the engine running time and the coolant temperature prevents too high a temperature being displayed through radiant heat when the vehicle is stationary or moving slowly. Falling temperature values are always allowed.

The display's response pattern varies as temperature rises, according to coolant temperature and engine running time:

Coolant temperature < 60°C:
The current outside temperature value is always displayed when the instrument cluster is activated.
Coolant temperature > 60°C:
When the instrument cluster is activated rising outside temperature values are displayed with a delay.
Coolant temperature > 60°C and circuit 15 OFF:

The last measured temperature value is stored for a period of t = 60 min. When the instrument cluster is activated, the stored temperature value is shown in the outside temperature display.

If the coolant temperature sensor (B11/4) is defective or if it provides implausible coolant temperature value, the ME-SFI [ME] control unit sends a corresponding message over CAN to the instrument cluster. A coolant temperature of ≥ 60°C is assumed.

Set the time

After pressing the left button on the instrument cluster for > 5 s the colon in the time display starts to flash on and off. Now the left button or the right button can be used to set the time.

If one of the two buttons is not pressed again within the next 5 s, the set value is stored and the colon stops flashing.

Instrument cluster, component description	A1	GF54.30-P-6000MCU
Outside air temperature sender component description	B14	GF83.57-P-4000MCC
ME-SFI [ME] control unit, component description	N3/10	GF07.61-P-6000MCU
SAM control unit, component description	N10/10	GF54.21-P-4157MCU
Automated manual transmission control unit, component description	N15/6 Transmission 717.482	GF26.19-P-1010MCU