CANBUS Sytems does this sound about right....

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  1. #1

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    CANBUS Sytems does this sound about right....

    I was just looking at CANBUS systems on cars....as far as i can make out there are 3 wires from front to back of vehicles and numerous modules here and there...seems like the battery has i connection to earth of vehicle, a live wire either ignition or permant live that runs to the front to rear of the vehicle and 2 data wires, cam high and cam low that also run from front to rear of vehicle...so i assume when it comes out of the box at the back it just goes to the rear lamps and stuff as conventional wiring,same at the front around the headlamps etc...does that sound about right.....there are various nodes that transmit signals to the various receivers to command lights and stuff on...apparently the O has priority over the 1, they cant both e transmitted at once, and i think the system is so fast you never notice that, its all done at very high speed so looks like a conventional wiring system....invented by Robert Bosch apparently hi.....from Fred.
    I was just looking at CANBUS systems on cars....as far as i can make out there are 3 wires from front to back of vehicles and numerous modules here and there...seems like the battery has i connection to earth of vehicle, a live wire either ignition or permant live that runs to the front to rear of the vehicle and 2 data wires, cam high and cam low that also run from front to rear of vehicle...so i assume when it comes out of the box at the back it just goes to the rear lamps and stuff as conventional wiring,same at the front around the headlamps etc...does that sound about right.....there are various nodes that transmit signals to the various receivers to command lights and stuff on...apparently the O has priority over the 1, they cant both e transmitted at once, and i think the system is so fast you never notice that, its all done at very high speed so looks like a conventional wiring system....invented by Robert Bosch apparently hi.....from Fred.

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    CANBUS (Contained Area Network) is used to transmit "data" from one point (control unit) to another. This "data" or information can then be used, by one or more units, to take an appropriate action. The normal method to connect these points together is with a pair of twisted wires (single wire is also used), this is the "BUS" part of "CANBUS". These wire/s are only used for the transmission of "data" no power can be used from these wires. There are different speed systems depending on the importance and amount of data.

    Thus the CANBUS system is used to connect between units that have some sort of intelligence, Engine Control Unit (ECU), Body Control Module (BCM), Rear Electrical Control (REC), electric window control etc. Only information/data is transmitted, thus power has to be provided by normal wiring to operate any bulb, motor etc.
    Last edited by Frog7; 19-05-2017 at 08:22.

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    Ok thank you for reply.....Fred.

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    To make it simple.
    CANBUS is a system that all the car microprocessors communicate (talk) to each other. The decisions that they make are implemented by normal fuse-wire-bulb etc.

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    Just to add there are 3 can networks on Vauxhalls. High speed canbus, which operates on a twisted pair, Mid speed canbus, twisted pair, which has things like head unit and display on, and single wire can, which controls things like locks, Windows etc

    Sent from my D5803 using Tapatalk

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    Quote Originally Posted by CDTi-C-VXR View Post
    Just to add there are 3 can networks on Vauxhalls. High speed canbus, which operates on a twisted pair, Mid speed canbus, twisted pair, which has things like head unit and display on, and single wire can, which controls things like locks, Windows etc

    Sent from my D5803 using Tapatalk
    Just to add - theres a 4th can network added im approx 2012 - "CH-CAN" which operates on twisted pair. Here is the table below which shows what cars its fitted to and what its functions are.

    Model Group Component Component description Protocol Speed Address Pins
    ADAM Chassis Electronic Power Steering Electronic Power Steering CHCAN 0500.0 0x00000242 12, 13
    Ampera Chassis Multi-Axis Acceleration Sensor Module Multi-Axis Acceleration Sensor Module CHCAN 0500.0 0x00000244 12, 13
    Ampera Chassis Multi-Axis Acceleration Sensor Module Multi-Axis Acceleration Sensor Module CHCAN 0500.0 0x00000244 12, 13
    Ampera Chassis Steering Wheel Angle Sensor Module Steering Wheel Angle Sensor Module CHCAN 0500.0 0x0000024A 12, 13
    Ampera Chassis Steering Wheel Angle Sensor Module Steering Wheel Angle Sensor Module CHCAN 0500.0 0x0000024A 12, 13
    Astra-J Chassis Multi-Axis Acceleration Sensor Module Multi-Axis Acceleration Sensor Module CHCAN 0500.0 0x00000244 12, 13
    Astra-J Chassis Steering Wheel Angle Sensor Module Steering Wheel Angle Sensor Module CHCAN 0500.0 0x0000024A 12, 13
    Astra-J Chassis Suspension Control Module Suspension Control Module CHCAN 0500.0 0x0000024E 12, 13
    Cascada Chassis Multi-Axis Acceleration Sensor Module Multi-Axis Acceleration Sensor Module CHCAN 0500.0 0x00000244 12, 13
    Cascada Chassis Steering Wheel Angle Sensor Module Steering Wheel Angle Sensor Module CHCAN 0500.0 0x0000024A 12, 13
    Cascada Chassis Suspension Control Module Suspension Control Module CHCAN 0500.0 0x0000024E 12, 13
    Cruze Chassis Multi-Axis Acceleration Sensor Module Multi-Axis Acceleration Sensor Module CHCAN 0500.0 0x00000244 12, 13
    Cruze Chassis Steering Wheel Angle Sensor Module Steering Wheel Angle Sensor Module CHCAN 0500.0 0x0000024A 12, 13
    Insignia Chassis Multi-Axis Acceleration Sensor Module Multi-Axis Acceleration Sensor Module CHCAN 0500.0 0x00000244 12, 13
    Insignia Chassis Steering Wheel Angle Sensor Module Steering Wheel Angle Sensor Module CHCAN 0500.0 0x0000024A 12, 13
    Insignia Chassis Suspension Control Module Suspension Control Module CHCAN 0500.0 0x0000024E 12, 13
    Mokka Chassis Multi-Axis Acceleration Sensor Module Multi-Axis Acceleration Sensor Module CHCAN 0500.0 0x00000244 12, 13
    Mokka Chassis Steering Wheel Angle Sensor Module Steering Wheel Angle Sensor Module CHCAN 0500.0 0x0000024A 12, 13
    Zafira-C Chassis Multi-Axis Acceleration Sensor Module Multi-Axis Acceleration Sensor Module CHCAN 0500.0 0x00000244 12, 13
    Zafira-C Chassis Steering Wheel Angle Sensor Module Steering Wheel Angle Sensor Module CHCAN 0500.0 0x0000024A 12, 13
    Zafira-C Chassis Suspension Control Module Suspension Control Module CHCAN 0500.0 0x0000024E 12, 13
    Last edited by marks152; 19-05-2017 at 07:41.

  9. #7

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    Ok everyone thanks for your Input.....most interesting....from Fred.

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