GF54.30-P-3022T Display Distance, Function

GF54.30-P-3022T Display Distance, Function

Measuring mileage
The computer of the instrument cluster (A1) evaluates the following wheel speeds for the calculation of distance and speed:
^ Left front rpm sensor (L6/1)
^ Right front rpm sensor (L6/2)
^ Left rear rpm sensor (L6/3)
^ Right rear rpm sensor (L6/4)

The instrument cluster (A1) receives the wheel speeds in rpm by way of the Controller Area Network bus Class C (engine compartment) (CAN-C) from the ESP control unit (N47-5). The system also includes tire size in its calculations of speed and distance. Tire size is coded using STAR DIAGNOSIS.

Displaying the total mileage
The 6-digit display appears in kilometers or miles in the start screen below the multifunction display (A1p13) as soon as the instrument cluster (A1) 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 0. In this case the instrument cluster (A1) should be replaced. However, the internal counter continues to operate up to a maximum of 1,677,721 km or 1.000.000 miles. Processing always takes place in kilometers, the display in miles is converted.

Saving mileage counts
The total mileage figure remains stored for at least 5 years, even if the voltage supply is disconnected. Functional integrity is guaranteed under normal conditions over the full service life of the vehicle (15 years or 10,000 operating hours).

Displaying the trip mileage
The trip mileage is displayed as a 5-figure number on the main screen of the multifunction display (A1p13) in kilometers or miles as soon as the instrument cluster (A1) is activated. The range for the trip mileage odometer is from 0 to 9999.9 kilometers or miles. The display is reset to 0 once the maximum mileage is reached.

Reset the trip odometer
The trip odometer is reset to 0 by pressing the instrument illumination brightness control and reset button (A1r1) for more than t = 2 s.

Function requirements:
^ The instrument cluster (A1) is activated
^ The basic display (total mileage and trip odometer) is displayed on the multifunction display (A1p13).

Kilometer/miles changeover (up to 31.5.05)
The driver can switch the display from kilometers to miles using the "Settings" function.

Kilometer/miles changeover (as of 1.6.05)
The display of travel distances can no longer be changed over from kilometers to miles units via the "Settings" function via the "Settings" function. The kilometers/miles display is determined via the variant coding in the central gateway control unit (N93).

If implausible Controller Area Network (data bus/CAN bus) (CAN) messages are received for all wheel speed signals, the total and trip mileage displays are "frozen" and an error bit is set. The instrument cluster (A1) also passes the current reading of the main odometer on the class B (interior) controller area network bus (CAN-B).

Storage of data
If the battery (G1) is removed, the total mileage is stored for at least 10 years. The trip mileage is also protected against data loss if the battery (G1) is removed for a short period of time.