Display Operating Conditions, Function - GF54.30-P-3041KJ

MODEL 453.0 (except 453.091), 453.3 (except 453.391), 453.4 (except 453.491) with CODE K35 (Instrument cluster with monochrome display) 

MODEL 453.0 (except 453.091), 453.3 (except 453.391), 453.4 (except 453.491) with CODE K36 (Instrument cluster with color 8.9 cm (3.5") display) 

Function requirements, general 

• Terminal 15 ON

Display operating conditions, general 

The operating conditions display provides the driver with permanent information about the current operating conditions of the vehicle.

The "display operating conditions" function comprises the following subfunctions:

• Display of speed function sequence 
• Display of engine speed function sequence 
• Display of coolant temperature function sequence 
• Display of travel distance function sequence 
• Display of fuel quantity function sequence 
• Function sequence for gear indicator and transmission mode display (with transmission 700.4) 

Display of speed function sequence 

The vehicle speed is calculated on the basis of the wheel speeds.

The Electronic Stability Program control unit (N30/4) sends information on the wheel speeds over the interior CAN to the instrument cluster. The instrument cluster calculates the current vehicle speed, compares it against an internally stored speedometer characteristic, and then actuates the speedometer (A1p8) to match by way of a stepper motor.

Display of engine speed function sequence 

The ME-SFI control unit (N3/10) sends information on the engine speed via the interior CAN to the instrument cluster. The instrument cluster receives these and actuates the tachometer (A15p4) accordingly via a stepper motor over the additional instrument LIN.

Display of coolant temperature function sequence 

The coolant temperature is recorded by the coolant temperature sensor (B11/4). The ME-SFI control unit reads in the signal of the coolant temperature sensor, uses it to calculate the coolant temperature and then sends the corresponding value over the interior CAN to the instrument cluster. The instrument cluster receives the value for the coolant temperature and displays it in the multifunction display of the instrument cluster, only with code (K36) Instrument cluster with color 8.9 cm (3.5") display.

The coolant temperature is displayed by an LCD bar indicator. The display changes color across the following three temperature ranges:

• T < 50°C: The bar of the coolant temperature gauge appears in blue.
• T = 50 to 110°C: The bar of the coolant temperature gauge appears in a neutral color.
• T > 110°C (start of red warning range): The bar of the coolant temperature gauge appears in red.

At coolant temperatures of T > 110°C, the instrument cluster also actuates the coolant temperature warning lamp (A1e54). An appropriate warning message appears in the multifunction display (A1p13) of the instrument cluster. If the instrument cluster does not receive any value for the coolant temperature, it actuates the coolant temperature warning lamp. The coolant temperature display is not actuated.

Display of travel distance function sequence 

The instrument cluster calculates the traveled distance from the wheel speeds, taking the tire circumference into consideration.

The Electronic Stability Program control unit sends information on the wheel speeds over the interior CAN to the instrument cluster.

The main odometer reading is shown as a 6-digit figure in kilometers, as soon as the instrument cluster is activated. The range for the main odometer is from 0 to 999, 999 kilometers.

The trip distance is displayed in the multifunction display of the instrument cluster. The maximum displayed counter reading of the trip distance is 9999, 9. If this value is reached, an overflow back to 0 takes place.

The main odometer reading is saved continuously to the nonvolatile part of the instrument cluster's internal memory. This memory guarantees the retention of the counter reading for at least ten years even when the on-board electrical system battery (G1) is disconnected. The current reading of the trip odometer is likewise stored in the nonvolatile memory of the instrument cluster.

Display of fuel quantity function sequence 

The fuel tank fill level indicator fuel level sensor (M3/3b1) registers the fill level in the fuel tank. The instrument cluster reads in the signals of the fuel tank fill level indicator fuel level sensor directly. The fuel supply is indicated to the driver by eight segments in the multifunction display.

Refueling is only detected (display updated) when a refill quantity of at least 3.4 I has been added. There is always a time delay before the display is updated. This reduces display fluctuations. The reserve range is equivalent to a quantity of 0 to approx. 5 liters. Once the reserve range has been reached, the fuel tank symbol changes color to yellow and the last segment in the multifunction display flashes at a frequency of 1 Hz. The reserve range is defined by comparing the measured fill level against a stored tank characteristic.

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

Function sequence for gear indicator and transmission mode display (with transmission 700.4) 

The gear indicator and transmission mode display are shown in the multifunction display in the instrument cluster.

Gear indicator:

Information for gear indicator and transmission mode display is sent by the dual clutch transmission control unit (N15/13) to the drive train CAN (CAN C). The ME-SFI control unit forwards this information over the interior CAN to the instrument cluster.

	Electrical function schematic of instrument cluster, control/warning message		PE54.30-P-2055-97BBA
	Overview of system components, instrument cluster (IC) component description		GF54.30-P-9996KJ