CANbus

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//-->Custom CANbus Distribution PanelVersion 1.0Prepared By:Note from the AuthorIf you have any questions or comments, big or small, please feel free to email me,lee@nsxjr.com.The most recent version of this document can be downloaded from the web atwww.nsxjr.com.Warning - Disclaimer••••The installer shall indemnify the author and editors for any claims or liability arisingfrom the vehicle modifications described in this document.To follow this guide requires alterations to the electrical system of the vehicle.Read and understand the entire document before beginning work.Disconnect the negative battery terminal before altering vehicle electronics.© 2006 Lee H.This document describes the installation of a distribution panel to enable quick and easy connectionto the CANbus (ControllerArea Network)in Audi vehicles. The vehicle has many CANbus systems,from engine management, to transmission control, to the one of interest here called “infotainment”.These are all separate networks, and the “infotainment” communication network is the one that helpsall the radio, telephone, navigation, telematics, etc in a vehicle communicate with one another in anefficient manner. All of these different items are connected to the CANbus like a computer networkand they all communicate via two wires, CAN H and CAN L. The CANbus network is available in thevehicle if the clock in the tachometer dial is digital. If the vehicle has an analog clock then stop here,the wiring in this document will not apply to that vehicle.These instructions will not describe how to install an actual device, but instead theCANbus distribution panel can be used for any other device installation thatrequires connection to the CANbus for proper operation. The materials needed area mini-breadboard from Radio Shack and some CAT-5 ethernet cable. This type ofcable is ideal for connections to the CANbus network in the vehicle and contains 4twisted pairs of wire in different colors, each pair with a solid and striped wire.Decide on a location to install the breadboard. A location should be chosen that is easily accessibleand will not interfere with other items under the dash. A good location is to the right side of the glovebox. See the picture on the next page for a visual of this location. Next, remove the headunit and run aCAT-5 cable from this area to the breadboard mounting location. Behind the headunit, choose onetwisted pair of wires from the CAT-5 and splice into the CAN H and CAN L wires in the radio wiringharness. The harness pins will be labeled on a sticker on the headunit for reference. Tuck away andtape off the three extra pairs of wires, these will not be needed but could be used in the future ifanother CANbus connection is needed behind the headunit for another device. Remember which wirewas used for CAN H and which for CAN L (solid or striped). Reinstall the headunit.At the breadboard location, install the other end of the CAT-5 pair (that was justspliced into CAN) into the breadboard. The breadboard layout is shown at the right.Choose one lane to be CAN H and a different lane to be CAN L. The lanes at theedge of the top and bottom are connected across the entire board. The lanes in themiddle are connected up and down and have only 5 connections each. There are noconnections across the middle of the board. In the picture on the next page, CAN His shown in the first lane on the top and CAN L is using the first lane on the bottom(Option 2). It is recommended to keep the CAN H on the top and CAN L on thebottom to make the connections easy to remember. Be sure to zip-tie the cables tosomething solid near the panel to keep them secure. Once the CAN wires frombehind the radio are connected to the panel, the installation is complete.Now, to connect other devices to CANbus, simply plug in the correct wires from the device into theproper lanes on the distribution panel. It will accept wire sizes from 30-20 AWG (0.05 – 0.50 mm).For example, if the installer needs to mount a Dietz 1417 module for use with the RNS-E navigationsystem, the CANbus wires from the Dietz harness would simply plug into their respective lanes on thepanel instead of having to be spliced into the CANbus wires elsewhere. Another installationfrequently required would be the SAT radio tuner. For this installation, a new CAT-5 cable should beextended from the distribution panel into the trunk area where the SAT tuner module is installed.With this installation method, there will be 3 spare pairs of wires in the CAT-5 cable that are not used.These can be reserved for future use if another module is installed in the trunk that should need aconnection to CANbus. Two options are shown on the following page. There are many more optionsthan shown here, but these give ideas of how to use the different sections of the panel.©2006 Lee H.NSX JR – Custom CANbus Distribution Panel – Version 1.0Page 1Option 1Option 2__________________________________________________________________________________________________________©2006 Lee H.NSX JR – Custom CANbus Distribution Panel – Version 1.0Page 2 [ Pobierz całość w formacie PDF ]