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I'm doing a senior project about automating the braking system in cars and make it smarter

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  • So what have you researched so far? Which car?
    – Solar Mike
    Commented Feb 21, 2018 at 12:10
  • It would depend on the car and the age of the car. The number of parameters accessed by the OBD II interface between older cars and newer cars, and even then it varies on the "level" of car. So a Mercedes Benz from 1999 will have more parameters accessible via the OBD II than a 2017 Toyota Aygo would for example.
    – mickburkejnr
    Commented Feb 21, 2018 at 12:34
  • FYI Only some vehicles with active traction control systems will even have a mechanism for the computer to apply the brakes.
    – agentp
    Commented Feb 21, 2018 at 16:14
  • Not thru OBD but you could trick the ABS system by sending false signals to the rotation sensors, I'm not sure if that's what you're looking for. I'm assuming this is either an automated car control or hacking project.
    – Chris
    Commented Feb 21, 2018 at 16:24
  • @Chris you can definitely actuate the valves in the bpmv abs assembly through the dlc. Why trick the sensors when the functionality is built into the ebcm?
    – Ben
    Commented Feb 21, 2018 at 22:53

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OBD stands for On Board Diagnostics. It is used to provide vehicle diagnostic information. It is read-only, except for specific log entries and specific fault codes that can be reset. So no, you cannot control the braking system of a car through the OBD port.

That does not however mean that a vehicle cannot be hacked through its diagnostic interface, but this is heavily dependent on car make/model and is not legal in any way.

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  • It might be perfectly legal depending on where you are @MadMarky, but you are correct it's good to be prudent.
    – GdD
    Commented Feb 21, 2018 at 13:24
  • On some cars you can force the ABS to operate to bleed the system...
    – Solar Mike
    Commented Feb 21, 2018 at 16:40
  • @SolarMike, that's true, but then you'd most likely be accessing the proprietary CAN Bus or similar, not strictly using the OBDII interface.
    – JPhi1618
    Commented Feb 22, 2018 at 16:01

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