GF54.30-P-3044RIA Trip Computer, Function
GF54.30-P-3044RIA Trip Computer, Function
General function requirements
^ Circuit 15 On
Trip computer, general
The trip computer provides data and information on average fuel consumption, trip time, average speed, travel distance and range.
The trip computer provides the following display screens:
- "AFTER START" (short-distance memory)
- "AFTER RESET" (long-distance memory)
The information displayed refers to the point in time of the last reset of the short-distance memory ("After start") or of the longdistance memory ("After reset").
The information is displayed as follows:
- Left multifunction display (A1p13)
- Selected display screen "AFTER START" or "AFTER RESET"
- Travel distance driven "AFTER START" or "AFTER RESET"
- Right multifunction display (A1p15)
- Average speed traveled
- Time elapsed "AFTER START" or "AFTER RESET"
- Average consumption
The display screen is selected by scrolling with the scroll forward and back button (S110s1) and then selecting with the system selection button (S110s3).
The trip computer is comprised of the following partial functions:
^ Kilometer/miles switchover function sequence
^ Display travel distance function sequence
^ Display travel time function sequence
^ Display average speed function sequence
^ Display fuel consumption function sequence
^ Display range function sequence
^ Reset function sequence
Kilometer/miles switchover function sequence
The trip computer uses the distance unit set in the instrument cluster (A1).
The dimensional units (kilometers or miles) are switched over via the selection "Settings" in the left multifunction display.
Display travel distance function sequence
Depending on the setting and coding of the national version of the instrument cluster, the travel distance is displayed in kilometers or miles.
The travel distance is calculated in the instrument cluster from the wheel speeds.
The wheel speeds are recorded by 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). The SBC hydraulic unit (A7/3) reads in the signals and forwards them to the ESP, SPS [PML] and BAS control unit (N47-5). They are then forwarded to the instrument cluster via engine compartment CAN.
The travel distance is displayed in a range of 0 to 65,535 km or 0 to 40,959 miles with a resolution of one kilometer or one mile.
Display travel time function sequence
The travel time displayed is the time measured internally in the trip computer since the last reset of the short distance memory or long distance memory.
The travel time is shown in the right multifunction display.
When the travel time or distance information exceeds the maximum available display (99:59 hours or 65,535 km/40,959 miles), the system automatically resets the travel time and distance.
Display average speed function sequence
The display is in "km/h" or "mph" depending on the instrument cluster setting.
The speed display has an accuracy of one kilometer per hour or one mile per hour and is updated once per second. The display range extends from 0 to 260 km/h or 0 to 160 mph.
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 from the wheel speeds.
Display fuel consumption function sequence
Depending on the setting and coding of the national version of the instrument cluster the fuel consumption is displayed in:
- Liters per 100 km or
- Miles per gallon or
- Kilometers per liter
The trip computer calculates the fuel consumption from the following information:
- Consumption signal from ME-SFI [ME] control unit (N3/10) via engine compartment CAN
- Travel distance covered
The distance traveled is calculated by the instrument cluster based on the wheel speed signals it receives from the ESP, SPS [PML] and BAS control unit. Due to the different travel distances stored in the short distance memory or long distance memory, the values displayed in the "AFTER START" and "AFTER RESET" display screens can differ because they are based on different data records.
Display range function sequence
The range is displayed after the "Range" display screen is activated in the left multifunction display.
The display screen is selected by scrolling with the scroll forward and back button and then selecting with the system selection button.
Depending on setting, the display is in either kilometers or miles. The range is updated in increments of one mile or one kilometer. In addition to the range, the remaining tank content is displayed in liters or gallons depending on the country coding. Updates are performed in increments of one liter or 0.2 gallons.
The trip computer determines the estimated range based on the ratio between current tank content and average fuel consumption ("AFTER START").
The trip computer receives the information as follows:
- The current tank content is recorded by the fuel level indicator sensor (B4). The rear SAM control unit (N10/8) reads in the sensor and forwards the signal to the instrument cluster via the interior CAN (CAN B).
- The average fuel consumption is calculated from the data in the short distance memory.
Reset function sequence
The contents of the long and short distance memory can be reset via the instrument illumination brightness control and reset button (A1r1) of the instrument cluster.
The reset function is comprised of the following subfunctions:
^ Manual reset of long or short distance memory function sequence
^ Automatic reset of short distance memory function sequence
Manual reset of long or short distance memory function sequence
The following actions must be performed in the order listed to manually reset the long or short distance memory:
- Circuit 15 On
- Select "AFTER START" or "AFTER RESET" display screen using the scroll forward/back button and the system selection button of the left multifunction steering wheel button group
- Actuate instrument illumination brightness control and reset button for one second
Automatic reset of short distance memory function sequence
Since the "AFTER START" display (short distance memory) is intended for the data of one driving cycle, the contents of this display are automatically reset if the instrument cluster is not activated for t = 4 h.
