GF54.50-P-0001RT Trip Computer (TRIP), Function
GF54.50-P-0001RT Trip Computer (TRIP), Function
- up to model year 08
Statistic 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.
It is possible to access two different data memories:
The contents of the short distance memory are shown in the display screen "as of start", the contents of the long distance memory are shown in the "as of reset".
It is possible to reset the trip computer manually using the instrument and controls illumination button, bright (A1s4), instrument and controls illumination button, dim (A1s5) or trip odometer reset button (A1s3).
The following functions are provided by the trip computer:
^ Kilometers driven "since start" or "since reset"
^ Time passed since the "start" or after the last "reset"
^ Average speed since the "start" or after the last "reset"
^ Average fuel consumption since the "start" or after the last "reset"
The range with the amount of fuel in the tank can also be displayed via the multifunction display.
Operation:
The trip computer is operated via the left multifunction steering wheel button group (S110)
The instrument cluster receives all the information for the function of the trip computer via the engine compartment CAN and interior CAN.
Function overview
The trip computer is integrated in the instrument cluster. The instrument cluster 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 does not serve as an interface between the databus systems. This function is reserved for the central gateway control unit (N93).
Listed below are the CAN messages that are important for the functions of the instrument cluster including the trip computer.
The connections of the instrument cluster are described in the last section of this document.
The trip computer receives the following input signals:
^ Wheel speeds from the ESP control unit (N47-5) via the engine compartment CAN
^ The fuel consumption signal via the engine compartment CAN from the ME control unit (N3/10)
^ The time on vehicles with the COMAND operating, display and control unit via the interior CAN via the audio gateway control unit (N93/1) and this via MOST from the COMAND operating, display and control unit (A40/3)(A40/3)
^ The status of "circuit 15" and "ignition key inserted" from the EIS [EZS] control unit (N73) via the interior CAN"
^ The operating signals from the buttons of the multifunction steering wheel from the steering column module (N80) via the interior CAN
^ The fuel tank fill level from the rear SAM control unit via the interior CAN (N10/8)
CAN messages of pushbuttons of multifunction steering wheel
In view of the fact that the pushbuttons of the multifunction steering wheel perform several functions, the signals of these pushbuttons must be conditioned accordingly:
^ All the buttons of the left multifunction steering wheel button group and right multifunction steering wheel button group (S111) are voltage-coded and are read in by the steering column module.
^ The steering column module places the corresponding messages on the interior CAN.
^ These CAN messages are received by the instrument cluster.
^ The instrument cluster interprets these messages in combination with the systems currently displayed on the multifunction display and passes these interpreted messages on the interior CAN.
Reception messages for the multifunction display
All signals for the messages in the multifunction display come via 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.
