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Thread: CAN bus

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    Regular Member blakewp's Avatar
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    Default CAN bus

    Im after info on the implementation of CAN in the vectra, from what i can work out its very similar in operation to RS485 which ive done a lot of work with years ago.
    Does anyone have info on what is transmitted across the bus, how many busses there are, what modules are on each bus etc ?

    or is this all tightly held secrets by vauxhall ?

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    Regular Member Jason123's Avatar
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    Default

    Have a look at http://en.wikipedia.org/wiki/CAN-bus

    clicking on some of the links you can end up at manufacturers sites, like this one, I dont know if Kvaser do the Vx canbus chip but they do alot

    http://www.kvaser.com/can/protocol/index.htm

    Happy hunting

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    Default

    The basic CAN protocol is described in this document:
    http://www.semiconductors.bosch.de/pdf/can2spec.pdf

    There are three CANs in the Vectra:
    1. The high speed CAN is 500 kb/s and is a differential pair. The engine and transmission controllers and anything else that needs rapid information transfer use this bus (ABS, etc.)
    2. The mid speed CAN is around 95 kb/s and is a differential pair. It's used for the climate control and radio.
    3. The low speed CAN runs at 33 kb/s and is unbalanced. It's used for everything else.


    The CIM is the gateway between the high and low speed CANs.
    The display is the gateway between the mid and low speed CANs.

    The content of the messages on these busses is Opel secret stuff.

    Here's another page with some info:
    http://www.gmtcny.com/lan.htm

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