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Thread: Body control unit

  1. #1
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    Default Body control unit

    I have been informed that my front wipers have stoped because the BCU has failed,is this unit likely to be responsible for the alarm going off when it feels like it?
    Cheers
    Clive

  2. #2
    Regular Member TonyP2020's Avatar
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    Vehicle : Mokka

    Trim : SE - Orange Rock 's !!

    Engine : 1.7CDTi

    Year : 2014

    Default

    I'm not sure the BCU has much to do with the wipers.
    In the engine fusebox, try checking F5, F11, F14, F22, & F34.
    However the wiper motor itself can have a fault with the self park earth connection.
    Good Luck with sorting it.

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    Thanks Tony I will pass this on to my tame mechanic

  4. #4
    Regular Member Critch's Avatar
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    Vehicle : Mk1 renault scenic... I know I know but it drives

    Trim : Basic

    Engine : 1.6 16v

    Year : 2003

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    Wipers I would put down to either motor at fault or cim fault

    as for alarm it it could be a number of things. Window sensors and ultra sonic sensors being most common

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    Quote Originally Posted by Critch View Post
    Wipers I would put down to either motor at fault or cim fault

    as for alarm it it could be a number of things. Window sensors and ultra sonic sensors being most common
    Please excuse my ignorance but what is "cim" please?

  6. #6
    Regular Member Hue Jarse's Avatar
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    Vehicle : Vectra Estate

    Trim : SRi

    Engine : 1.8 VVT (Z18XER)

    Year : 09

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    Quote Originally Posted by clive.22 View Post
    Please excuse my ignorance but what is "cim" please?

    Column Interface Module.
    It's the canbus module that interfaces the steering column controls to the rest of the car.

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    Quote Originally Posted by Hue Jarse View Post
    Column Interface Module.
    It's the canbus module that interfaces the steering column controls to the rest of the car.
    Doesn't anybody use wire any more?

  8. #8
    Regular Member TonyP2020's Avatar
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    Vehicle : Mokka

    Trim : SE - Orange Rock 's !!

    Engine : 1.7CDTi

    Year : 2014

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    Haha, Yes, they do use wires still. Very thin ones usually.

    And they also do things like having resistors in the switches.
    For example a Electric Window switch which when pushed to, say, open the window is earthed via a resistor which drops the 12v on the wire to, say, 9v.
    To close the window the same wire is earthed via a different resistor and this drops the voltage to, say, 4.5V.
    And all this is controlled by the individual Door module which is also on the Canbus network.

    And there is a lot more.

    When you push the brake pedal it sends a signal to the REC in the boot and this module tells the individual bulbs to light up.
    The brake light switch also sends signals to the Engine Management system, whilst the REC sends signals to the Engine Management system, the ABS and the Auto Gearbox if fitted.

    Now the Headlight Switch.............................
    But you get the idea.

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    Regular Member stevoxsi's Avatar
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    Vehicle : Insignia

    Trim : Sri Vx-line

    Engine : 2.0 Cdti 160

    Year : 2011

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    I work at a place making buses, the electronics would fry your head! E.g. To turn on an indicator.... Signal goes to main ecu, which sends a signal to a node at the front to tell the front indicator to flash. Meanwhile another signal goes to the rear node... So basically 3 computers to flash 2 bulbs!

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    Quote Originally Posted by TonyP2020 View Post
    Haha, Yes, they do use wires still. Very thin ones usually.

    And they also do things like having resistors in the switches.
    For example a Electric Window switch which when pushed to, say, open the window is earthed via a resistor which drops the 12v on the wire to, say, 9v.
    To close the window the same wire is earthed via a different resistor and this drops the voltage to, say, 4.5V.
    And all this is controlled by the individual Door module which is also on the Canbus network.

    And there is a lot more.

    When you push the brake pedal it sends a signal to the REC in the boot and this module tells the individual bulbs to light up.
    The brake light switch also sends signals to the Engine Management system, whilst the REC sends signals to the Engine Management system, the ABS and the Auto Gearbox if fitted.

    Now the Headlight Switch.............................
    But you get the idea.
    Quote Originally Posted by stevoxsi View Post
    I work at a place making buses, the electronics would fry your head! E.g. To turn on an indicator.... Signal goes to main ecu, which sends a signal to a node at the front to tell the front indicator to flash. Meanwhile another signal goes to the rear node... So basically 3 computers to flash 2 bulbs!
    Anybody got a users manual for black magic and hocuspocus

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