Fuses on a st - BMW F800 Riders Forum & Registry



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  1. #1
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    Can someone please tell me where the fuses are kept on a 06 plate st as my back brake lights don't work

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  3. #2
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    Assuming that we are speaking here of the F800ST there are no fuses. Chassis electrics are controlled by the ZFE module.

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    There are no fuses, it is all controlled by CANBUS. It will turn off an electrical circuit if there is something wrong with it.

    I would start by checking if you have power going to the bulb holder, and working backwards from there; checking the live feed, checking the ground, connectors & the brake switches.
    BMW F800ST, 2010, Black, Fuzeblock, Sat Nav, BMW Tank Bag, Givi Touring Screen, Spotlights, 50K Miles 

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  6. #4
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    Quote Originally Posted by DJ123 View Post
    There are no fuses, it is all controlled by CANBUS. It will turn off an electrical circuit if there is something wrong with it.

    I would start by checking if you have power going to the bulb holder, and working backwards from there; checking the live feed, checking the ground, connectors & the brake switches.
    It is NOT controlled by the CANbus.

    The CANbus is a Controller Area Network that facilitates communications between various controllers.

    One such controller is the ZFE. it is the ZFE that controls the chassis electrics.

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  7. #5
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    Quote Originally Posted by DJLOW View Post
    Can someone please tell me where the fuses are kept on a 06 plate st as my back brake lights don't work
    I assume the brake light does not go on when either the front or rear brake lever is pressed?

    Also assuming you've checked the bulb (it has two filaments - one for the running light.) Is the running light on?

    Here's a good thread to read - the troubleshooting advice is well suited to your situation. Particularly, the five pin connector.

    https://f800riders.org/forum/showthr...icator-problem
    Concrete remains undefeated. 

  8. #6
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    I had to snicker. When I got my ST, I spent about 2 hours looking for that damn fuse box. I had no idea what CANBUS was. Your ST has several. surprise unique features. Other than the initial learning curve, you are really going to enjoy the bike.
    Randy
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  10. #7
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    Thanks for all your support i am just waiting for the better weather then i can test the bike just hope its the same as my f650gs or better

  11. #8
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    The CANbus is a Controller Area Network that facilitates communications between various controllers.

  12. #9
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    Quote Originally Posted by IgnacioDenver View Post
    The CANbus is a Controller Area Network that facilitates communications between various controllers.
    Sounds familiar - and correct.

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  13. #10
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    Quote Originally Posted by DJLOW View Post
    Can someone please tell me where the fuses are kept on a 06 plate st as my back brake lights don't work
    This is a bulb issue most likely, however, you would normally see a LAMP error on your display if the tail bulb is burned out. If neither the foot pedal or the brake lever trigger the light and you don't have a LAMP error you may have a wiring fault somewhere.
    Claudio
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    BMW MOA Member, 2019 F800GT, 2010 F650GS twin 

  14. #11
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    CANBUS controllers on the BMW bikes are just the generation/level of smarts that were the first to incorporate current monitoring alongside the software controlled on/off switching too ... the electronics-based switching (power MOSFETs usually) replaces the relays/high current switches so that's why the wiring to the rider switches are so small, and there is only one relay (starter). Current monitoring gives the ability to override the turn-on 'request' if the current in the controlled output is too high, usually faster than a fuse could blow as well.

    So CANBUS doesn't do anything with fuses directly, but on BMW bikes the use of a CANBUS-based 'body controller' also usually implies a 100% fuseless system

    (Current monitoring was being used in 1986 in the BMW cars beginning around the E32 7 Series, which would tell you which bulb was out on the drivers LCD ... and was so complex electronically it was nightmare with 1st-gen soldering faults on very expensive controllers... don't ask me how I know )

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