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OBD Vehicle Protection

Discussion in 'Do It Yourself' started by jayadev, Nov 29, 2011.

  1. jayadev

    jayadev Esperto

    Messages:
    1,057
    Kannur, India
    Kannur
    Grande Punto 1.3 90 HP
    Vehicle immobilisers are fitted as standard to modern cars . Antitheftmechanisms have become more sophisticatedbut so have the methods employed by crooks. Nowadays once the thief has gainedaccess to a vehicle they will most likely use an electronic deactivation tool which seeks to disable the immobiliser, once this has been accomplished a blank transponder key/card can be used to start the engine. In many casescommunication with the immobiliser is made using the OBD-II diagnostic connector.Although the OBD-II protocol itself does not support the immobiliser, the vehicle manufacturer is free to use the interface as necessaryfor communication, either the standardOBD-II signals or unused pins in the OBD-IIconnector (i.e. those undefined in the OBDIIstandard). Using one of these pathways the immobiliser can usually be electronically disabled.This may be unsettling news for owners ofexpensive vehicles but when professional car-thieves call, armed with the latest OBD-II hacking equipment this simple low-cost low tech solution may be all that you need. The idea is very simple: if all connections to theOBD-II connector are disconnected there is no possibility for any equipment, no matter how sophisticated to gain access via the vehicle’s wiring.The OBD-II connector is usually located underneath the dashboard ; once its wiring loom has been identified a switch can be inserted in line with the wires.The switch should be hidden away somewhere that is not obvious. In normal operation you will be protected if the vehicle is runwith the wires to the socket disconnected.Make sure however that you throw the switch reconnecting the socket before you next takethe vehicle along to a garage for servicing or fault diagnosis. When a hacker plugs in a deactivation tool itwill power up as normal but probably report something like ‘protocol unrecognised’ when any communication with the OBD port isattempted.:devilface;)
    1 person likes this.
  2. Cinju

    Cinju Esperto

    Messages:
    1,333
    Trivandrum
    @Jayadev that is a good piece of information . Let's assume that our local car theives are not that clever enough until the chinese come up with a cheap product for hacking .;) . But as the number of luxory cars & the complexity in car's security system increases , local thieves may be forced to learn all these techniques. Suddenly reminded me of the movie "Gone in 60 secs" ..:p
  3. vIjAy_kHaSa

    vIjAy_kHaSa Esperto

    Messages:
    1,352
    Panchkula
    Code from the code card have to be entered in the software if you have to enable or disable any sensor or particular feature in the ECU which affects security either of car or person.
    If the thieves get access to code then they can disable immobilizer and take away the car but not without entering code unless they have a towing van.
    Some cars like Pajero, Tata Safari used to come with default code as 0000 which was the reason they were stolen so easily.

    A person I know has put a switch in the fuel pump power supply line and switches that off when the car is parked in the open for the night. Car starts for around 2 secs and then die down after which no amount of cranking starts the car again.
    Last edited: Nov 30, 2011
    1 person likes this.
  4. Narayan

    Narayan Regolare

    Messages:
    282
    Chennai
    This seems to be a lot of technical information ! Hope our cars have different codes !
  5. royj

    royj Esperto

    Messages:
    1,306
    Trivandrum
  6. jayadev

    jayadev Esperto

    Messages:
    1,057
    Kannur, India
    Kannur
    Grande Punto 1.3 90 HP
    I dont know about local thieves but presently we have all the technology in hand to lift a car with sophisticated technology.these codes and programs has gone simple and convenient that a 15year kid who is well versed in computers and car game can have successive chance.

    a micro controller costs 150-250 , and its associated development board for 1500 bucks ,if you have internet and bit of programming skill then our cars with immobilizers are like dice games..(really a fun cracking it) .
  7. Viny

    Viny Esperto

    Messages:
    1,742
    :)
    Few Pointers

    1. You dont need OBD Connection Junctions, a Y split in pin for ECU can take care of connecting your OBD scanners.
    2. Yes it might have been fun to control the car over the OBD's but immobilizers in current era are not like 4 digit codes of 2000's, secondly there are multiple line of defenses, like the Engine ECU stores the code separately too.

    Yes to certain extent one can take control over the car, but for sure its not child play unless a pro builds up a software and hands over to kid to play with.

    Search for CarShark :p

    And finally FIAT has some screwed up OBD codes which doesnt at time falls in line with OBD standard codes :p
    Last edited: Dec 1, 2011
    1 person likes this.
  8. Srini

    Srini Regolare

    Messages:
    468
    Chennai
    This has to be true in all extent. FIAT as always is different from others..:p

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