GF54.50-P-0001GZ Trip Computer (TRIP), Function

GF54.50-P-0001GZ Trip Computer (TRIP), Function
- up to model year 08

Statistical data can be called up and displayed in the Trip computer menu. The trip computer is integrated into the instrument cluster (A1). Displays are shown in the multifunction display (A1p13) in the instrument cluster.

There are two different data memory options:
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".

The trip computer can be reset using the instrument and controls illumination button, bright (A1s4), instrument and controls illumination button, dim (A1s5) or the trip odometer reset button (A1s3).

The following functions are provided by the trip computer:
^ Distance driven "since start" or "since reset"
^ Time elapsed since "start" or since the last "reset"
^ Average speed since "start" or since last "reset"
^ Average fuel consumption since "start" or since last "reset"

The range with the amount of fuel in the tank can also be displayed on the multifunction display.

Operation:
The trip computer is operated using the left multifunction steering wheel button group (S110)

All information for the trip computer functions are received by the Instrument cluster over the engine compartment CAN and over the interior CAN.

Function overview
The trip computer is integrated in the instrument cluster. The instrument cluster is connected to the:
^ engine compartment CAN and to
^ interior CAN.
Data is exchanged with virtually all the control units over the two bus systems.

The instrument cluster does not however act as an interface between the two data bus 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 for 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
^ Fuel consumption signal via the engine compartment CAN from the ME control unit (N3/10)
^ Time over the interior CAN from the audio gateway control unit (N93/1) and this over the MOST of the COMAND operating, display and control unit (A40/3), for vehicles with COMAND operating, display and control unit
^ "Terminal 15" status over the interior CAN from the EIS [EZS] control unit (N73) and "Key in ignition"
^ Actuation signals from the multifunction steering wheel buttons over the interior CAN from the steering column module (N80)
^ Fuel tank level from the rear SAM control unit (N10/8) over the interior CAN

CAN messages of push-buttons 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 pushbuttons of the left multifunction steering wheel pushbutton group and the right multifunction steering wheel pushbutton group (S111) are voltage-coded and are read in by the steering column module.
^ The steering column module sends the relevant messages to 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 then relays the interpreted messages back onto the interior CAN.

Reception messages for the multifunction display
All the signals for the messages in the multifunction display 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.