GF54.30-P-3041RC Display Operating Conditions, Function
GF54.30-P-3041RC Display Operating Conditions, Function
General function requirements
^ Instrument cluster (A1) activated
Display operating conditions, general
The Display operating conditions function is comprised of the following partial functions:
^ Speed display function sequence
^ Display of engine speed function sequence
^ Display of coolant temperature function sequence
^ Display of fuel quantity function sequence
^ Display of travel distance function sequence
^ Gear and transmission mode display function sequence (with transmission 722)
^ Engine oil level indicator function sequence
Additional function requirements for vehicle speed display
^ Circuit 15 On
Speed display function sequence
The wheel speeds determined via the left front rpm sensor (L6/1), right front rpm sensor (L6/2), left rear rpm sensor (L6/3) and right rear rpm sensor (L6/4) are read in by the ESP and BAS control unit (N47-5) and transmitted to the instrument cluster via the engine compartment CAN.
The instrument cluster calculates the current speed from the values received. This is displayed via a stepper motor in the electronic speedometer (A1p8).
Additional function requirements for display of engine speed
^ Circuit 61 ON
Display of engine speed function sequence
The crankshaft speed recorded by the crankshaft position sensor (L5) is read in by the ME-SFI [ME] control unit (N3/10) and placed on the engine compartment CAN.
The instrument cluster receives this data and actuates the tachometer accordingly via a stepper motor (A1p5).
Additional function requirements for coolant temperature display
^ Circuit 15 On
Display of coolant temperature function sequence
The coolant temperature recorded by the coolant temperature sensor (B11/4) is read in by the ME-SFI [ME] control unit and placed on the engine compartment CAN.
The coolant temperature is shown in the upper multifunction display (A1p13).
Additional function requirements for fuel quantity display
^ Circuit 15 On
Display of fuel quantity function sequence
The fill level is measured by the fuel level indicator sensor (B4), read in by the rear SAM control unit with fuse and relay module (N10/2) and forwarded to the instrument cluster via interior CAN. The received values are evaluated with the aid of a tank characteristic and displayed in the fuel level and reserve indicator (A1p2) via a stepper motor.
If the reserve range has been reached (approx. 12.5 % of the maximum tank contents), the fuel reserve warning lamp (A1e4) comes on.
When the reserve range has dropped to approx. 50 %, a gas station symbol in the form of a gasoline pump is shown in the range menu in the instrument cluster instead of the distance reading.
Display behavior:
- After circuit 15 ON, the current fill level is displayed on the fuel level indicator. In the process, the pointer runs up without being buffered.
- While the vehicle is driving, the display is updated via a buffering system.
- When circuit 15 is switched off, the pointer of the fuel level indicator moves back to zero.
Additional function requirements for travel distance display
^ Circuit 15 On
Display of travel distance function sequence
The function of the display of travel distance is comprised of several subfunctions:
^ Calculation of travel distance
^ Display of main odometer reading
^ Display of trip distance
^ Saving mileage counts
Calculation of travel distance
The wheel speed determined by the rpm sensors is read in by the ESP and BAS control unit and placed on the engine compartment CAN. The instrument cluster calculates the travel distance from values received.
Display of main odometer reading
The display appears in the upper multifunction display. The maximum displayed counter reading of the main odometer reading is 999.999.
Display of trip distance
The display appears in the upper multifunction display. The maximum displayed counter reading of the trip distance is 9999.9. If this value is achieved, the figure returns to zero.
The counter reading of the trip distance can be reset manually to zero by pressing the trip odometer reset button (A1s3).
Saving mileage counts
When the battery is disconnected the main odometer reading remains stored G1) for at least five years.
The trip odometer reading is also protected against data loss if the battery is disconnected.
Additional function requirements for gear indicator
^ Circuit 15 On
Function sequence for gear indicator
The current gear is displayed via the gear indicator (A1p12) and the current transmission mode is displayed via the transmission mode display (A1p16).
The data required for the current transmission mode are transmitted by the electronic selector lever module control unit (N15/5) via engine compartment CAN. The instrument cluster receives the information required for the current gear from the ETC [EGS] control unit (N15/3) (with transmission 722.6) or from the fully integrated transmission control unit (VGS) (Y3/8n4) (with transmission 722.9).
Additional function requirements for engine oil level indicator
^ Circuit 15 On
^ Circuit 61 OFF
Engine oil level indicator function sequence
With engine 271 or 272:
The engine oil level is monitored by the oil level check switch (S43). It is read in by the ME-SFI [ME] control unit. Where necessary, the ME-SFI [ME] control unit transmits a message to the instrument cluster via engine compartment CAN. As a consequence the instrument cluster displays the corresponding message in the upper multifunction display.
On engine 113:
The calculations for engine oil level measurement are made by the central gateway control unit (N93). If necessary, a message is transmitted to the instrument cluster, which displays the message in the upper multifunction display.
