GF54.50-P-0001TX Function of Trip Computer (TRIP)
GF54.50-P-0001TX Function Of Trip Computer (TRIP)
Statistical data can be interrogated and displayed in the trip computer menu. The trip computer is integrated into the instrument cluster (A1). The display takes place via the multifunction display (A1p13) in the instrument cluster (A1).
Two different data memories can be accessed: to access:
The contents of the short distance memory are shown in the "since start" display screen, the contents of the long distance memory are shown in the "since reset" display screen.
The trip computer can be reset manually with the instrument illumination rheostat and reset button (A1r1).
The following functions are provided by the trip computer:
^ Kilometers driven "since start" or "since reset"
^ Time elapsed since "start" or after the last "reset"
^ Average speed since "start" or after the last "reset"
^ Average fuel consumption since "start" or since the last "reset"
The range with the amount of fuel in the tank can also be displayed on the multifunction display (A1p13).
Operation:
The driver operates the trip computer using the left multifunction steering wheel pushbutton group (S110).
Function overview
The trip computer is integrated into the instrument cluster (A1). The instrument cluster (A1) is connected to:
^ the engine compartment CAN and
^ interior CAN.
Data is exchanged with virtually all the control units over the two bus systems.
However, the instrument cluster (A1) does not serve an interface between the two data bus systems. This function is reserved for the central gateway control unit (N93).
The instrument cluster (A1) receives all the information required for the trip computer functions over the engine compartment CAN and over the interior compartment CAN.
This is where the CAN messages key for the functions of the instrument cluster (A1), including trip computer, are listed.
The connections of the instrument cluster (A1) are described in the final section of this document.
The trip computer receives the following input signals:
^ The wheel speeds from the ESP, SPS [PML] and BAS control unit (N47-5) via the engine compartment CAN
^ The consumption signal from the ME-SFI [ME] control unit (N3/10) via the engine compartment CAN
^ via the interior CAN from the audio gateway control unit (N93/1) and this via MOST from the COMAND operating, display and control unit (A40/3) the time, on vehicles with COMAND operating, display and control unit (A40/3)
^ From the EIS [EZS] control unit (N73) via interior CAN the condition "circuit 15" and "key in ignition"
^ From the steering column module (N80) via interior CAN the operating signals from the buttons on the multifunction steering wheel
^ The fuel tank level from the rear SAM control unit with fuse and relay module (N10/2) via interior CAN
CAN messages from the buttons on the multifunction steering wheel
Since the buttons on the multifunction steering wheel each have several functions, the signals from these buttons must be processed accordingly:
^ All the buttons in the left multifunction steering wheel button group (S110) and the right multifunction steering wheel button group (S111) are voltage-coded and are read by the steering column module (N80).
^ The steering column module (N80) relays the relevant messages onto the interior compartment CAN.
^ These CAN messages are received by the instrument cluster (A1).
^ The instrument cluster (A1) interprets these messages in conjunction with the systems displayed in the multifunction display (A1p13) and passes on these interpreted messages on the interior CAN.
Received messages for the multifunction display
All the signals for the messages in the multifunction display (A1p13) are received over the engine compartment CAN or interior CAN. Information about the signal paths and other details about the different messages can be found in the function descriptions for the relevant systems.