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Ignition Cut-Off Switch with Pre-Conditions, Service Mode & Secret Combination: Diagram & Tips

PanRatownik 10116 10
Best answers LABEL_AI_GENERATED

How can I build a car ignition cut-off switch that only enables the ignition when certain preconditions are met, and includes a hidden service mode to disable the protection?

You can build it with a small microcontroller or with logic gates, for example a four-input AND gate plus small 5 V stabilizers, and possibly a NOT stage if you need to detect missing voltage or noise [#16948022][#16948029] Before wiring anything, verify whether you have a simple 12 V signal or a data bus at the points you want to use, so you do not end up needing a tow truck [#16948029] If you make the system from scratch, include a service mode that permanently disables the protection so you do not have to reveal the secret combination every time the car goes to a mechanic or car wash [#16949262] A ready-made alternative mentioned in the thread is the Proxima cockpit lock, which was reported to work on cars with a classic electrical installation [#16950810][#16951973] Be aware that fitting this kind of lock can be problematic in newer or more complex cars such as some BMW, Audi, Mercedes, or A4 B7 models [#16951973][#17052302]
AI summary based on the discussion. May contain errors.
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  • #1 16947959
    PanRatownik
    Level 7  
    Posts: 5
    Good morning,

    I am looking for a diagram or tips on how to make / design a car protection in such a way that we disconnect / reconnect the ignition using a switch. In addition, I would like this switch to work only in appropriate conditions, e.g. left mirror control turned on or handbrake applied, etc. If this pre-condition (or conditions) is not met, the switch should not turn the ignition on, but it should be turned off. In addition, the whole should have such a thing as the service mode, in which we switch when we leave the car at the mechanic or on the car wash so as not to reveal our secret combination.

    Does anyone have any idea on this? Thank you in advance for your tips.
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  • #2 16948022
    sylweksylwina
    Moderator of Computers service  
    Posts: 13216
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    You can make a circuit at some uC, then almost anything can be done :P
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  • #3 16948029
    D214d3k
    Level 39  
    Posts: 3837
    Help: 543
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    Four-input AND gate, several small 5V stabilizers, possibly NOT if you want to detect a lack of voltage and noise. Just first check if you have 12V or, for example, a data bus in places where you want to connect. And do it so that you do not have to ride a tow truck :) .
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    #5 16949262
    bhtom
    Level 39  
    Posts: 4498
    Help: 446
    Rate: 604
    Hello,

    PanRatownik wrote:
    I'm looking for a diagram or tips ...


    If you do such protection "from scratch" then do not forget about the possibility of enabling the service mode, i.e. the possibility of permanently deactivating the protection. Because why do you need such a combined protection, if every time you leave the car in the service, at the mechanic or in the car wash you will have to inform about how to deactivate the protection so that you can start the car. If you have the service mode, then you activate it and you will not have to disclose the existence of security to anyone.

    Best regards.
  • #6 16949891
    D214d3k
    Level 39  
    Posts: 3837
    Help: 543
    Rate: 633
    You can always add a "bypass" in some hard-to-reach place.
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  • #8 16951973
    CameR

    Moderator of Vehicle Security  
    Posts: 7710
    Help: 1139
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    norbert.s. wrote:
    I installed, programmed, works.

    Yes, good protection but only on cars with a "classic" electrical installation design.
    I can't imagine fitting this lock in a new BMW, Audi or Mercedes?
    Company Account:
    ABC KOM
    Barcelońska 77, Katowice, 40-683 | Tel.: 601XXXXXX (Show) | Company Website: https://www.auto-alarm.com.pl
    Helpful post? Buy me a coffee.
  • #9 16952215
    PanRatownik
    Level 7  
    Posts: 5
    bhtom wrote:
    If you do such protection "from scratch" then do not forget about the possibility of enabling the service mode, i.e. the possibility of permanently deactivating the protection.


    Seemingly obvious, and I didn't think of it. Thank you very much for the tip :)

    Best regards!

    Added after 8 [minutes]:

    norbert.s. wrote:
    I installed, programmed, works.


    An interesting solution, thanks to Norbert for the tip! If you want it will be installed in every car.
  • #10 17051411
    akj123
    Level 2  
    Posts: 2
    Rate: 1
    What exactly is the installation Proksima Cockpit Lock. I mean these two additional cables for setting the code. I would like to mount it in A4 B7 or give advice for any switches.
  • #11 17052302
    CameR

    Moderator of Vehicle Security  
    Posts: 7710
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    akj123 wrote:
    I would like to mount it in A4 B7

    In this car model 2004 - 2008 you will already have problems by mounting this type of lock. It is not as simple and obvious as in "Matiza".
    Also pay attention to how much the descriptions (pictograms) of switches (e.g. light switch or window opening buttons) are worn in some heavily used cars.
    Ignition Cut-Off Switch with Pre-Conditions, Service Mode & Secret Combination: Diagram & Tips Ignition Cut-Off Switch with Pre-Conditions, Service Mode & Secret Combination: Diagram & Tips Ignition Cut-Off Switch with Pre-Conditions, Service Mode & Secret Combination: Diagram & Tips
    Company Account:
    ABC KOM
    Barcelońska 77, Katowice, 40-683 | Tel.: 601XXXXXX (Show) | Company Website: https://www.auto-alarm.com.pl
    Helpful post? Buy me a coffee.
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Topic summary

LABEL_AI_GENERATED
The discussion revolves around designing an ignition cut-off switch for vehicles that operates under specific pre-conditions, such as the left mirror control being activated or the handbrake being applied. Participants suggest using a microcontroller (uC) for circuit design, incorporating a four-input AND gate, and ensuring the system can detect voltage levels. A service mode is emphasized to allow temporary deactivation of the ignition protection without disclosing the secret combination to mechanics or car wash staff. Ready-made solutions like the Proxima cockpit lock are mentioned, although concerns are raised about compatibility with modern vehicles like BMW, Audi, and Mercedes. Installation challenges for specific models, such as the Audi A4 B7, are also discussed.
AI summary based on the discussion. May contain errors.
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